Add test coverage to CSS class generation (#2285)

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`

1 files changed, 7 insertions, 3 deletions

diff --git a/app/helpers/stream_entries_helper.rb b/app/helpers/stream_entries_helper.rb
index daa4a48e4..a1dfe2ecf 100644
--- a/app/helpers/stream_entries_helper.rb
+++ b/app/helpers/stream_entries_helper.rb
@@ -31,9 +31,13 @@ module StreamEntriesHelper
   end
 
   def microformats_h_class(status, is_predecessor, is_successor, include_threads)
-    return 'h-cite' if is_predecessor || status.reblog || is_successor
-    return 'h-entry' unless include_threads
-    ''
+    if is_predecessor || status.reblog? || is_successor
+      'h-cite'
+    elsif include_threads
+      ''
+    else
+      'h-entry'
+    end
   end
 
   def rtl?(text)