The two methods `StreamEntriesHelper#stream_link_target` and
`StreamEntriesHelper#acct` are based on checking whether we are running
in an embedded view.
This adds some test helper code to make the testing easier. We extracted
some "magic strings" to constants to lower the coupling in the specs.
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`
* Remote spec for non-existent entry_classes helper method
This method no longer exists, and is handled by a local variable in a partial
instead.
* Remove spec for non-existent Account#ping! method
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