minor #21903 [Yaml] Fix the tests (GuilhemN)

This PR was merged into the 2.7 branch.

Discussion
----------

[Yaml] Fix the tests

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Fix tests that are currently useless (previously part of https://github.com/symfony/symfony/pull/19782).

Commits
-------

5107b94baf [Yaml] Fix the tests

src/Symfony/Component/Yaml/Tests/DumperTest.php

@@ -210,23 +210,25 @@ EOF;
     public function getEscapeSequences()
     {
         return array(
-            'null' => array("\t\\0", '"\t\\\\0"'),
-            'bell' => array("\t\\a", '"\t\\\\a"'),
-            'backspace' => array("\t\\b", '"\t\\\\b"'),
-            'horizontal-tab' => array("\t\\t", '"\t\\\\t"'),
-            'line-feed' => array("\t\\n", '"\t\\\\n"'),
-            'vertical-tab' => array("\t\\v", '"\t\\\\v"'),
-            'form-feed' => array("\t\\f", '"\t\\\\f"'),
-            'carriage-return' => array("\t\\r", '"\t\\\\r"'),
-            'escape' => array("\t\\e", '"\t\\\\e"'),
-            'space' => array("\t\\ ", '"\t\\\\ "'),
-            'double-quote' => array("\t\\\"", '"\t\\\\\\""'),
-            'slash' => array("\t\\/", '"\t\\\\/"'),
-            'backslash' => array("\t\\\\", '"\t\\\\\\\\"'),
-            'next-line' => array("\t\\N", '"\t\\\\N"'),
-            'non-breaking-space' => array("\t\\<EFBFBD>", '"\t\\\\<5C>"'),
-            'line-separator' => array("\t\\L", '"\t\\\\L"'),
-            'paragraph-separator' => array("\t\\P", '"\t\\\\P"'),
+            'empty string' => array('', "''"),
+            'null' => array("\x0", '"\\0"'),
+            'bell' => array("\x7", '"\\a"'),
+            'backspace' => array("\x8", '"\\b"'),
+            'horizontal-tab' => array("\t", '"\\t"'),
+            'line-feed' => array("\n", '"\\n"'),
+            'vertical-tab' => array("\v", '"\\v"'),
+            'form-feed' => array("\xC", '"\\f"'),
+            'carriage-return' => array("\r", '"\\r"'),
+            'escape' => array("\x1B", '"\\e"'),
+            'space' => array(' ', "' '"),
+            'double-quote' => array('"', "'\"'"),
+            'slash' => array('/', '/'),
+            'backslash' => array('\\', '\\'),
+            'next-line' => array("\xC2\x85", '"\\N"'),
+            'non-breaking-space' => array("\xc2\xa0", '"\\_"'),
+            'line-separator' => array("\xE2\x80\xA8", '"\\L"'),
+            'paragraph-separator' => array("\xE2\x80\xA9", '"\\P"'),
+            'colon' => array(':', "':'"),
         );
     }