Tests/Tokenizer: rename two tests

Follow up on squizlabs/PHP_CodeSniffer 3639 and 585 which introduced these tests.

While there are no strict naming conventions for the `Core\Tokenizers\Tokenizer` tests, most tests in this directory now include the name of the method being covered by the test in the test class/file name.

That was not the case for these two test classes. Fixed now.

Includes moving the `@covers` tag from method level to class level.

Author: jrfnl

tests/Core/Tokenizers/Tokenizer/HeredocNowdocCloserTest.inc renamed to tests/Core/Tokenizers/Tokenizer/CreatePositionMapHeredocNowdocCloserTest.inc

@@ -15,8 +15,10 @@
  * Heredoc/nowdoc closer token test.
  *
  * @requires PHP 7.3
+ *
+ * @covers PHP_CodeSniffer\Tokenizers\Tokenizer::createPositionMap
  */
-final class HeredocNowdocCloserTest extends AbstractTokenizerTestCase
+final class CreatePositionMapHeredocNowdocCloserTest extends AbstractTokenizerTestCase
 {
 
 
@@ -27,7 +29,6 @@ final class HeredocNowdocCloserTest extends AbstractTokenizerTestCase
      * @param array<string, int|string|null> $expected   Expectations for the token array.
      *
      * @dataProvider dataHeredocNowdocCloserTabReplacement
-     * @covers       PHP_CodeSniffer\Tokenizers\Tokenizer::createPositionMap
      *
      * @return void
      */

tests/Core/Tokenizers/Tokenizer/HeredocNowdocCloserTest.php renamed to tests/Core/Tokenizers/Tokenizer/CreatePositionMapHeredocNowdocCloserTest.php

@@ -13,8 +13,10 @@
 
 /**
  * Heredoc/nowdoc opener token test.
+ *
+ * @covers PHP_CodeSniffer\Tokenizers\Tokenizer::createPositionMap
  */
-final class HeredocNowdocOpenerTest extends AbstractTokenizerTestCase
+final class CreatePositionMapHeredocNowdocOpenerTest extends AbstractTokenizerTestCase
 {
 
 
@@ -25,7 +27,6 @@ final class HeredocNowdocOpenerTest extends AbstractTokenizerTestCase
      * @param array<string, int|string|null> $expected   Expectations for the token array.
      *
      * @dataProvider dataHeredocNowdocOpenerTabReplacement
-     * @covers       PHP_CodeSniffer\Tokenizers\Tokenizer::createPositionMap
      *
      * @return void
      */