More explicit tests for `image_get_intermediate_size()`.

After [33807], `Tests_Image_Intermediate_Size::test_get_intermediate_sizes_by_array_zero_width()`
was failing intermittently. This failure was due to the use of a random number
for the image height. When the height was sufficiently large - $height >= 202 -
to change the aspect ratio of the cropped image (based on WP's threshold of a
1px difference), the test passed. And when the height was exactly 200, the
medium image size was hit exactly. The failure occurred only with a height of
201, which is close enough to 200 so that WP determined that the aspect ratio
of the potential crop was close enough to match.

The current changeset splits the test into two, in order to demonstrate the
failure.

See #17626. Fixes #34087.
Built from https://develop.svn.wordpress.org/trunk@34775


git-svn-id: http://core.svn.wordpress.org/trunk@34740 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34774';
+$wp_version = '4.4-alpha-34775';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.