diff --git a/tests/regress.sh b/tests/regress.sh
index ac53e0d..261383f 100755
--- a/tests/regress.sh
+++ b/tests/regress.sh
@@ -3,13 +3,52 @@
 . $(atf_get_srcdir)/test_env.sh
 
 tests_init \
+	case_sensitivity \
+	depgraph_break_1 \
+	depgraph_break_2 \
+	depgraph_break_3 \
 	variable \
 	keep_system_libs \
 	libs \
 	libs_only \
 	cflags_only \
 	incomplete_libs \
-	incomplete_cflags
+	incomplete_cflags \
+	isystem_munge_order \
+	isystem_munge_sysroot \
+	pcpath
+
+case_sensitivity_body()
+{
+	export PKG_CONFIG_PATH="${selfdir}/lib1"
+	atf_check \
+		-o inline:"3\n" \
+		pkgconf --variable=foo case-sensitivity
+	atf_check \
+		-o inline:"4\n" \
+		pkgconf --variable=Foo case-sensitivity
+}
+
+depgraph_break_1_body()
+{
+	export PKG_CONFIG_PATH="${selfdir}/lib1"
+	atf_check -s exit:1 -e ignore \
+		pkgconf --exists --print-errors 'foo > 0.6.0 foo < 0.8.0'
+}
+
+depgraph_break_2_body()
+{
+	export PKG_CONFIG_PATH="${selfdir}/lib1"
+	atf_check -s exit:1 -e ignore \
+		pkgconf --exists --print-errors 'nonexisting foo <= 3'
+}
+
+depgraph_break_3_body()
+{
+	export PKG_CONFIG_PATH="${selfdir}/lib1"
+	atf_check -s exit:1 -e ignore \
+		pkgconf --exists --print-errors 'depgraph-break'
+}
 
 variable_body()
 {
@@ -66,3 +105,27 @@ incomplete_cflags_body()
 		-o inline:" \n" \
 		pkgconf --cflags incomplete
 }
+
+isystem_munge_order_body()
+{
+	export PKG_CONFIG_PATH="${selfdir}/lib1"
+	atf_check \
+		-o inline:"-isystem /opt/bad/include -isystem /opt/bad2/include  \n" \
+		pkgconf --cflags isystem
+}
+
+isystem_munge_sysroot_body()
+{
+	export PKG_CONFIG_PATH="${selfdir}/lib1" PKG_CONFIG_SYSROOT_DIR='/test'
+	atf_check \
+		-o match:"-isystem /test/opt/bad/include" \
+		pkgconf --cflags isystem
+}
+
+pcpath_body()
+{
+	export PKG_CONFIG_PATH="${selfdir}/lib2"
+	atf_check \
+		-o inline:"-fPIC -I/test/include/foo  \n" \
+		pkgconf --cflags ${selfdir}/lib3/bar.pc	
+}