The code that generates CSS is based on a lot of boolean conditions.
The possible combinations of these grows exponentially as we add more
conditions.
Since most of the code is conditional on a single boolean, we tested the
following:
1. All `false`
2. All `true`
3. Each individual flag set to `true`
The methods tested are:
* `StreamEntriesHelper#style_classes`
* `StreamEntriesHelper#microformats_classes`
* `StreamEntriesHelper#microformats_h_class`
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