641 lines
22 KiB
Rust
641 lines
22 KiB
Rust
// Copyright 2015-2016 Brian Smith.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//! Testing framework.
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//!
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//! Unlike the rest of *ring*, this testing framework uses panics pretty
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//! liberally. It was originally designed for internal use--it drives most of
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//! *ring*'s internal tests, and so it is optimized for getting *ring*'s tests
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//! written quickly at the expense of some usability. The documentation is
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//! lacking. The best way to learn it is to look at some examples. The digest
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//! tests are the most complicated because they use named sections. Other tests
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//! avoid named sections and so are easier to understand.
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//!
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//! # Examples
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//!
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//! ## Writing Tests
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//!
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//! Input files look like this:
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//!
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//! ```text
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//! # This is a comment.
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//!
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//! HMAC = SHA1
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//! Input = "My test data"
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//! Key = ""
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//! Output = 61afdecb95429ef494d61fdee15990cabf0826fc
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//!
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//! HMAC = SHA256
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//! Input = "Sample message for keylen<blocklen"
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//! Key = 000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F
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//! Output = A28CF43130EE696A98F14A37678B56BCFCBDD9E5CF69717FECF5480F0EBDF790
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//! ```
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//!
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//! Test cases are separated with blank lines. Note how the bytes of the `Key`
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//! attribute are specified as a quoted string in the first test case and as
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//! hex in the second test case; you can use whichever form is more convenient
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//! and you can mix and match within the same file. The empty sequence of bytes
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//! can only be represented with the quoted string form (`""`).
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//!
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//! Here's how you would consume the test data:
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//!
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//! ```ignore
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//! use ring::test;
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//!
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//! test::run(test::test_file!("hmac_tests.txt"), |section, test_case| {
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//! assert_eq!(section, ""); // This test doesn't use named sections.
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//!
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//! let digest_alg = test_case.consume_digest_alg("HMAC");
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//! let input = test_case.consume_bytes("Input");
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//! let key = test_case.consume_bytes("Key");
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//! let output = test_case.consume_bytes("Output");
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//!
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//! // Do the actual testing here
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//! });
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//! ```
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//!
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//! Note that `consume_digest_alg` automatically maps the string "SHA1" to a
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//! reference to `digest::SHA1_FOR_LEGACY_USE_ONLY`, "SHA256" to
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//! `digest::SHA256`, etc.
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//!
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//! ## Output When a Test Fails
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//!
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//! When a test case fails, the framework automatically prints out the test
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//! case. If the test case failed with a panic, then the backtrace of the panic
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//! will be printed too. For example, let's say the failing test case looks
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//! like this:
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//!
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//! ```text
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//! Curve = P-256
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//! a = 2b11cb945c8cf152ffa4c9c2b1c965b019b35d0b7626919ef0ae6cb9d232f8af
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//! b = 18905f76a53755c679fb732b7762251075ba95fc5fedb60179e730d418a9143c
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//! r = 18905f76a53755c679fb732b7762251075ba95fc5fedb60179e730d418a9143c
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//! ```
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//! If the test fails, this will be printed (if `$RUST_BACKTRACE` is `1`):
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//!
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//! ```text
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//! src/example_tests.txt: Test panicked.
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//! Curve = P-256
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//! a = 2b11cb945c8cf152ffa4c9c2b1c965b019b35d0b7626919ef0ae6cb9d232f8af
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//! b = 18905f76a53755c679fb732b7762251075ba95fc5fedb60179e730d418a9143c
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//! r = 18905f76a53755c679fb732b7762251075ba95fc5fedb60179e730d418a9143c
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//! thread 'example_test' panicked at 'Test failed.', src\test.rs:206
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//! stack backtrace:
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//! 0: 0x7ff654a05c7c - std::rt::lang_start::h61f4934e780b4dfc
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//! 1: 0x7ff654a04f32 - std::rt::lang_start::h61f4934e780b4dfc
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//! 2: 0x7ff6549f505d - std::panicking::rust_panic_with_hook::hfe203e3083c2b544
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//! 3: 0x7ff654a0825b - rust_begin_unwind
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//! 4: 0x7ff6549f63af - std::panicking::begin_panic_fmt::h484cd47786497f03
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//! 5: 0x7ff654a07e9b - rust_begin_unwind
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//! 6: 0x7ff654a0ae95 - core::panicking::panic_fmt::h257ceb0aa351d801
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//! 7: 0x7ff654a0b190 - core::panicking::panic::h4bb1497076d04ab9
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//! 8: 0x7ff65496dc41 - from_file<closure>
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//! at C:\Users\Example\example\<core macros>:4
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//! 9: 0x7ff65496d49c - example_test
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//! at C:\Users\Example\example\src\example.rs:652
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//! 10: 0x7ff6549d192a - test::stats::Summary::new::ha139494ed2e4e01f
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//! 11: 0x7ff6549d51a2 - test::stats::Summary::new::ha139494ed2e4e01f
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//! 12: 0x7ff654a0a911 - _rust_maybe_catch_panic
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//! 13: 0x7ff6549d56dd - test::stats::Summary::new::ha139494ed2e4e01f
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//! 14: 0x7ff654a03783 - std::sys::thread::Thread::new::h2b08da6cd2517f79
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//! 15: 0x7ff968518101 - BaseThreadInitThunk
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//! ```
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//!
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//! Notice that the output shows the name of the data file
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//! (`src/example_tests.txt`), the test inputs that led to the failure, and the
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//! stack trace to the line in the test code that panicked: entry 9 in the
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//! stack trace pointing to line 652 of the file `example.rs`.
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#[cfg(feature = "alloc")]
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use alloc::{format, string::String, vec::Vec};
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#[cfg(feature = "alloc")]
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use crate::{bits, digest, error};
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#[cfg(any(feature = "std", feature = "test_logging"))]
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extern crate std;
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/// `compile_time_assert_clone::<T>();` fails to compile if `T` doesn't
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/// implement `Clone`.
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pub fn compile_time_assert_clone<T: Clone>() {}
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/// `compile_time_assert_copy::<T>();` fails to compile if `T` doesn't
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/// implement `Copy`.
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pub fn compile_time_assert_copy<T: Copy>() {}
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/// `compile_time_assert_send::<T>();` fails to compile if `T` doesn't
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/// implement `Send`.
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pub fn compile_time_assert_send<T: Send>() {}
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/// `compile_time_assert_sync::<T>();` fails to compile if `T` doesn't
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/// implement `Sync`.
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pub fn compile_time_assert_sync<T: Sync>() {}
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/// `compile_time_assert_std_error_error::<T>();` fails to compile if `T`
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/// doesn't implement `std::error::Error`.
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#[cfg(feature = "std")]
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pub fn compile_time_assert_std_error_error<T: std::error::Error>() {}
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/// A test case. A test case consists of a set of named attributes. Every
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/// attribute in the test case must be consumed exactly once; this helps catch
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/// typos and omissions.
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///
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/// Requires the `alloc` default feature to be enabled.
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#[cfg(feature = "alloc")]
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#[derive(Debug)]
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pub struct TestCase {
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attributes: Vec<(String, String, bool)>,
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}
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#[cfg(feature = "alloc")]
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impl TestCase {
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/// Maps the string "true" to true and the string "false" to false.
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pub fn consume_bool(&mut self, key: &str) -> bool {
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match self.consume_string(key).as_ref() {
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"true" => true,
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"false" => false,
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s => panic!("Invalid bool value: {}", s),
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}
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}
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/// Maps the strings "SHA1", "SHA256", "SHA384", and "SHA512" to digest
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/// algorithms, maps "SHA224" to `None`, and panics on other (erroneous)
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/// inputs. "SHA224" is mapped to None because *ring* intentionally does
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/// not support SHA224, but we need to consume test vectors from NIST that
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/// have SHA224 vectors in them.
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pub fn consume_digest_alg(&mut self, key: &str) -> Option<&'static digest::Algorithm> {
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let name = self.consume_string(key);
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match name.as_ref() {
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"SHA1" => Some(&digest::SHA1_FOR_LEGACY_USE_ONLY),
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"SHA224" => None, // We actively skip SHA-224 support.
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"SHA256" => Some(&digest::SHA256),
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"SHA384" => Some(&digest::SHA384),
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"SHA512" => Some(&digest::SHA512),
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"SHA512_256" => Some(&digest::SHA512_256),
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_ => panic!("Unsupported digest algorithm: {}", name),
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}
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}
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/// Returns the value of an attribute that is encoded as a sequence of an
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/// even number of hex digits, or as a double-quoted UTF-8 string. The
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/// empty (zero-length) value is represented as "".
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pub fn consume_bytes(&mut self, key: &str) -> Vec<u8> {
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let s = self.consume_string(key);
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if s.starts_with('\"') {
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// The value is a quoted UTF-8 string.
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let mut bytes = Vec::with_capacity(s.as_bytes().len() - 2);
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let mut s = s.as_bytes().iter().skip(1);
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loop {
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let b = match s.next() {
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Some(b'\\') => {
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match s.next() {
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// We don't allow all octal escape sequences, only "\0" for null.
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Some(b'0') => 0u8,
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Some(b't') => b'\t',
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Some(b'n') => b'\n',
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// "\xHH"
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Some(b'x') => {
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let hi = s.next().expect("Invalid hex escape sequence in string.");
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let lo = s.next().expect("Invalid hex escape sequence in string.");
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if let (Ok(hi), Ok(lo)) = (from_hex_digit(*hi), from_hex_digit(*lo))
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{
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(hi << 4) | lo
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} else {
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panic!("Invalid hex escape sequence in string.");
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}
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}
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_ => {
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panic!("Invalid hex escape sequence in string.");
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}
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}
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}
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Some(b'"') => {
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if s.next().is_some() {
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panic!("characters after the closing quote of a quoted string.");
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}
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break;
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}
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Some(b) => *b,
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None => panic!("Missing terminating '\"' in string literal."),
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};
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bytes.push(b);
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}
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bytes
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} else {
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// The value is hex encoded.
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match from_hex(&s) {
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Ok(s) => s,
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Err(err_str) => {
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panic!("{} in {}", err_str, s);
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}
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}
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}
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}
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/// Returns the value of an attribute that is an integer, in decimal
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/// notation.
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pub fn consume_usize(&mut self, key: &str) -> usize {
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let s = self.consume_string(key);
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s.parse::<usize>().unwrap()
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}
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/// Returns the value of an attribute that is an integer, in decimal
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/// notation, as a bit length.
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#[cfg(feature = "alloc")]
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pub fn consume_usize_bits(&mut self, key: &str) -> bits::BitLength {
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let s = self.consume_string(key);
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let bits = s.parse::<usize>().unwrap();
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bits::BitLength::from_usize_bits(bits)
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}
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/// Returns the raw value of an attribute, without any unquoting or
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/// other interpretation.
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pub fn consume_string(&mut self, key: &str) -> String {
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self.consume_optional_string(key)
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.unwrap_or_else(|| panic!("No attribute named \"{}\"", key))
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}
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/// Like `consume_string()` except it returns `None` if the test case
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/// doesn't have the attribute.
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pub fn consume_optional_string(&mut self, key: &str) -> Option<String> {
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for (name, value, consumed) in &mut self.attributes {
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if key == name {
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if *consumed {
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panic!("Attribute {} was already consumed", key);
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}
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*consumed = true;
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return Some(value.clone());
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}
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}
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None
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}
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}
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/// References a test input file.
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#[cfg(feature = "alloc")]
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#[macro_export]
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macro_rules! test_file {
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($file_name:expr) => {
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crate::test::File {
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file_name: $file_name,
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contents: include_str!($file_name),
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}
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};
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}
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/// A test input file.
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#[cfg(feature = "alloc")]
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pub struct File<'a> {
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/// The name (path) of the file.
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pub file_name: &'a str,
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/// The contents of the file.
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pub contents: &'a str,
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}
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/// Parses test cases out of the given file, calling `f` on each vector until
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/// `f` fails or until all the test vectors have been read. `f` can indicate
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/// failure either by returning `Err()` or by panicking.
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///
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/// Requires the `alloc` default feature to be enabled
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#[cfg(feature = "alloc")]
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pub fn run<F>(test_file: File, mut f: F)
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where
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F: FnMut(&str, &mut TestCase) -> Result<(), error::Unspecified>,
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{
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let lines = &mut test_file.contents.lines();
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let mut current_section = String::from("");
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let mut failed = false;
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while let Some(mut test_case) = parse_test_case(&mut current_section, lines) {
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let result = match f(¤t_section, &mut test_case) {
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Ok(()) => {
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if !test_case
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.attributes
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.iter()
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.any(|&(_, _, consumed)| !consumed)
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{
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Ok(())
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} else {
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failed = true;
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Err("Test didn't consume all attributes.")
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}
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}
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Err(error::Unspecified) => Err("Test returned Err(error::Unspecified)."),
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};
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if result.is_err() {
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failed = true;
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}
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#[cfg(feature = "test_logging")]
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{
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if let Err(msg) = result {
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std::println!("{}: {}", test_file.file_name, msg);
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for (name, value, consumed) in test_case.attributes {
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let consumed_str = if consumed { "" } else { " (unconsumed)" };
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std::println!("{}{} = {}", name, consumed_str, value);
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}
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};
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}
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}
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if failed {
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panic!("Test failed.")
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}
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}
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/// Decode an string of hex digits into a sequence of bytes. The input must
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/// have an even number of digits.
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#[cfg(feature = "alloc")]
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pub fn from_hex(hex_str: &str) -> Result<Vec<u8>, String> {
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if hex_str.len() % 2 != 0 {
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return Err(String::from(
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"Hex string does not have an even number of digits",
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));
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}
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let mut result = Vec::with_capacity(hex_str.len() / 2);
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for digits in hex_str.as_bytes().chunks(2) {
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let hi = from_hex_digit(digits[0])?;
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let lo = from_hex_digit(digits[1])?;
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result.push((hi * 0x10) | lo);
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}
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Ok(result)
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}
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#[cfg(feature = "alloc")]
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fn from_hex_digit(d: u8) -> Result<u8, String> {
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use core::ops::RangeInclusive;
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const DECIMAL: (u8, RangeInclusive<u8>) = (0, b'0'..=b'9');
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const HEX_LOWER: (u8, RangeInclusive<u8>) = (10, b'a'..=b'f');
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const HEX_UPPER: (u8, RangeInclusive<u8>) = (10, b'A'..=b'F');
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for (offset, range) in &[DECIMAL, HEX_LOWER, HEX_UPPER] {
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if range.contains(&d) {
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return Ok(d - range.start() + offset);
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}
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}
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Err(format!("Invalid hex digit '{}'", d as char))
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}
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#[cfg(feature = "alloc")]
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fn parse_test_case(
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current_section: &mut String,
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lines: &mut dyn Iterator<Item = &str>,
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) -> Option<TestCase> {
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let mut attributes = Vec::new();
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let mut is_first_line = true;
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loop {
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let line = lines.next();
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#[cfg(feature = "test_logging")]
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{
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if let Some(text) = &line {
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std::println!("Line: {}", text);
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}
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}
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match line {
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// If we get to EOF when we're not in the middle of a test case,
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// then we're done.
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None if is_first_line => {
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return None;
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}
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// End of the file on a non-empty test cases ends the test case.
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None => {
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return Some(TestCase { attributes });
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}
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// A blank line ends a test case if the test case isn't empty.
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Some(ref line) if line.is_empty() => {
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if !is_first_line {
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return Some(TestCase { attributes });
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}
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// Ignore leading blank lines.
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}
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// Comments start with '#'; ignore them.
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Some(ref line) if line.starts_with('#') => (),
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Some(ref line) if line.starts_with('[') => {
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assert!(is_first_line);
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assert!(line.ends_with(']'));
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current_section.truncate(0);
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current_section.push_str(line);
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let _ = current_section.pop();
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let _ = current_section.remove(0);
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}
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Some(ref line) => {
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is_first_line = false;
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let parts: Vec<&str> = line.splitn(2, " = ").collect();
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if parts.len() != 2 {
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panic!("Syntax error: Expected Key = Value.");
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};
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let key = parts[0].trim();
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let value = parts[1].trim();
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// Don't allow the value to be ommitted. An empty value can be
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// represented as an empty quoted string.
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assert_ne!(value.len(), 0);
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// Checking is_none() ensures we don't accept duplicate keys.
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attributes.push((String::from(key), String::from(value), false));
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}
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}
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}
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}
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/// Deterministic implementations of `ring::rand::SecureRandom`.
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///
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/// These implementations are particularly useful for testing implementations
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/// of randomized algorithms & protocols using known-answer-tests where the
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/// test vectors contain the random seed to use. They are also especially
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/// useful for some types of fuzzing.
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#[doc(hidden)]
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pub mod rand {
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use crate::{error, polyfill, rand};
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/// An implementation of `SecureRandom` that always fills the output slice
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/// with the given byte.
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#[derive(Debug)]
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pub struct FixedByteRandom {
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pub byte: u8,
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}
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impl rand::sealed::SecureRandom for FixedByteRandom {
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fn fill_impl(&self, dest: &mut [u8]) -> Result<(), error::Unspecified> {
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polyfill::slice::fill(dest, self.byte);
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Ok(())
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}
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}
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/// An implementation of `SecureRandom` that always fills the output slice
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/// with the slice in `bytes`. The length of the slice given to `slice`
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/// must match exactly.
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#[derive(Debug)]
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pub struct FixedSliceRandom<'a> {
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pub bytes: &'a [u8],
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}
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impl rand::sealed::SecureRandom for FixedSliceRandom<'_> {
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fn fill_impl(&self, dest: &mut [u8]) -> Result<(), error::Unspecified> {
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dest.copy_from_slice(self.bytes);
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Ok(())
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}
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}
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/// An implementation of `SecureRandom` where each slice in `bytes` is a
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/// test vector for one call to `fill()`. *Not thread-safe.*
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///
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/// The first slice in `bytes` is the output for the first call to
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/// `fill()`, the second slice is the output for the second call to
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/// `fill()`, etc. The output slice passed to `fill()` must have exactly
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/// the length of the corresponding entry in `bytes`. `current` must be
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/// initialized to zero. `fill()` must be called exactly once for each
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/// entry in `bytes`.
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#[derive(Debug)]
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pub struct FixedSliceSequenceRandom<'a> {
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/// The value.
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pub bytes: &'a [&'a [u8]],
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pub current: core::cell::UnsafeCell<usize>,
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}
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impl rand::sealed::SecureRandom for FixedSliceSequenceRandom<'_> {
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fn fill_impl(&self, dest: &mut [u8]) -> Result<(), error::Unspecified> {
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let current = unsafe { *self.current.get() };
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let bytes = self.bytes[current];
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dest.copy_from_slice(bytes);
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// Remember that we returned this slice and prepare to return
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// the next one, if any.
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unsafe { *self.current.get() += 1 };
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Ok(())
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}
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}
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impl Drop for FixedSliceSequenceRandom<'_> {
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fn drop(&mut self) {
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// Ensure that `fill()` was called exactly the right number of
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// times.
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assert_eq!(unsafe { *self.current.get() }, self.bytes.len());
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::{error, test};
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#[test]
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fn one_ok() {
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test::run(test_file!("test_1_tests.txt"), |_, test_case| {
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let _ = test_case.consume_string("Key");
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Ok(())
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});
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}
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#[test]
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#[should_panic(expected = "Test failed.")]
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fn one_err() {
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test::run(test_file!("test_1_tests.txt"), |_, test_case| {
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let _ = test_case.consume_string("Key");
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Err(error::Unspecified)
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});
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}
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#[test]
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#[should_panic(expected = "Oh noes!")]
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fn one_panics() {
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test::run(test_file!("test_1_tests.txt"), |_, test_case| {
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let _ = test_case.consume_string("Key");
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panic!("Oh noes!");
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});
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}
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#[test]
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#[should_panic(expected = "Test failed.")]
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fn first_err() {
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err_one(0)
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}
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#[test]
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#[should_panic(expected = "Test failed.")]
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fn middle_err() {
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err_one(1)
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}
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#[test]
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#[should_panic(expected = "Test failed.")]
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fn last_err() {
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err_one(2)
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}
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fn err_one(test_to_fail: usize) {
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let mut n = 0;
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test::run(test_file!("test_3_tests.txt"), |_, test_case| {
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let _ = test_case.consume_string("Key");
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let result = if n != test_to_fail {
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Ok(())
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} else {
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Err(error::Unspecified)
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};
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n += 1;
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result
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});
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}
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#[test]
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#[should_panic(expected = "Oh Noes!")]
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fn first_panic() {
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panic_one(0)
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}
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#[test]
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#[should_panic(expected = "Oh Noes!")]
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fn middle_panic() {
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panic_one(1)
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}
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#[test]
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#[should_panic(expected = "Oh Noes!")]
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fn last_panic() {
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panic_one(2)
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}
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fn panic_one(test_to_fail: usize) {
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let mut n = 0;
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test::run(test_file!("test_3_tests.txt"), |_, test_case| {
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let _ = test_case.consume_string("Key");
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if n == test_to_fail {
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panic!("Oh Noes!");
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};
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n += 1;
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Ok(())
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});
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}
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#[test]
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#[should_panic(expected = "Syntax error: Expected Key = Value.")]
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fn syntax_error() {
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test::run(test_file!("test_1_syntax_error_tests.txt"), |_, _| Ok(()));
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}
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}
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