Tests: make dataproviders static

As of PHPUnit 10, data providers are (again) expected to be `static` methods.

This updates the test suite to respect that.

Includes removing the use of `$this` from select data providers.

Refs:
* sebastianbergmann/phpunit@9caafe2
* sebastianbergmann/phpunit 5100

Author: jrfnl

tests/ColorLinesTest.php

@@ -12,7 +12,7 @@
 class ColorLinesTest extends HighlighterTestCase
 {
     /** @var string */
-    private $input = array(
+    private static $input = array(
         7 => array (
             0 => array (
                 0 => 'token_keyword',
@@ -70,22 +70,22 @@ public function testColorLines($input, $expected, $withTheme = true)
      *
      * @return array
      */
-    public function dataColorLines()
+    public static function dataColorLines()
     {
         return array(
             'No lines' => array(
                 'input'    => array(),
                 'expected' => array(),
             ),
             'With theme' => array(
-                'input'     => $this->input,
+                'input'     => self::$input,
                 'expected'  => array(
                     7 => '<token_keyword>function </token_keyword><token_default>bar</token_default><token_keyword>(</token_keyword><token_default>$param</token_default><token_unknown>) </token_unknown><token_keyword>{}</token_keyword>',
                 ),
                 'withTheme' => true,
             ),
             'Without theme' => array(
-                'input'     => $this->input,
+                'input'     => self::$input,
                 'expected'  => array(
                     7 => 'function bar($param) {}',
                 ),
@@ -110,7 +110,7 @@ public function testColorLinesWithRealColors()
         $method->setAccessible(true);
 
         $highlighter = new Highlighter($color);
-        $output = $method->invoke($highlighter, $this->input);
+        $output = $method->invoke($highlighter, self::$input);
         $method->setAccessible(false);
 
         $this->assertSame($expected, $output);

tests/GetCodeSnippetTest.php

@@ -57,7 +57,7 @@ public function testGetCodeSnippet($expected, $lineNo, $linesBeforeAfter = 2)
      *
      * @return array
      */
-    public function dataGetCodeSnippet()
+    public static function dataGetCodeSnippet()
     {
         return array(
             'Snippet at start of code - line 1' => array(

tests/GetWholeFileTest.php

@@ -14,7 +14,7 @@ class GetWholeFileTest extends HighlighterTestCase
     private $highlighter;
 
     /** @var string */
-    private $input = <<<'EOL'
+    private static $input = <<<'EOL'
 <?php
 
 namespace FooBar;
@@ -68,7 +68,7 @@ public function testGetWholeFile($input, $expected)
      *
      * @return array
      */
-    public function dataGetWholeFile()
+    public static function dataGetWholeFile()
     {
         return array(
             'Empty source' => array(
@@ -85,7 +85,7 @@ public function dataGetWholeFile()
 EOL
             ),
             'Multi-line' => array(
-                'input'    => $this->input,
+                'input'    => self::$input,
                 'expected' => <<<'EOL'
 <token_default><?php</token_default>
 
@@ -135,7 +135,7 @@ public function testGetWholeFileWithLineNumbers()
 <line_number>15| </line_number><token_default>?></token_default>
 EOL;
 
-        $output = $this->highlighter->getWholeFileWithLineNumbers($this->input);
+        $output = $this->highlighter->getWholeFileWithLineNumbers(self::$input);
         // Allow unit tests to succeed on non-*nix systems.
         $output = str_replace(array("\r\n", "\r"), "\n", $output);
 

tests/TokenizeTest.php

@@ -61,7 +61,7 @@ public function testEmptyFiles($original, $expected)
      *
      * @return array
      */
-    public function dataEmptyFiles()
+    public static function dataEmptyFiles()
     {
         return array(
             'Empty file' => array(
@@ -93,7 +93,7 @@ public function testPhpTags($original, $expected)
      *
      * @return array
      */
-    public function dataPhpTags()
+    public static function dataPhpTags()
     {
         return array(
             '"Long" open tag with close tag' => array(
@@ -135,7 +135,7 @@ public function testMagicConstants($original, $expected)
      *
      * @return array
      */
-    public function dataMagicConstants()
+    public static function dataMagicConstants()
     {
         $magicConstants = array(
             '__FILE__',
@@ -184,7 +184,7 @@ public function testMiscTokens($original, $expected)
      *
      * @return array
      */
-    public function dataMiscTokens()
+    public static function dataMiscTokens()
     {
         return array(
             'Constant (T_STRING)' => array(
@@ -263,7 +263,7 @@ public function testComments($original, $expected)
      *
      * @return array
      */
-    public function dataComments()
+    public static function dataComments()
     {
         return array(
             'Doc block: single line' => array(
@@ -378,7 +378,7 @@ public function testTextStrings($original, $expected)
      *
      * @return array
      */
-    public function dataTextStrings()
+    public static function dataTextStrings()
     {
         return array(
             'Single quoted text string' => array(
@@ -499,7 +499,7 @@ public function testInlineHtml($original, $expected)
      *
      * @return array
      */
-    public function dataInlineHtml()
+    public static function dataInlineHtml()
     {
         return array(
             'Inline HTML' => array(
@@ -532,7 +532,7 @@ public function testNameTokens($original, $expected)
      *
      * @return array
      */
-    public function dataNameTokens()
+    public static function dataNameTokens()
     {
         $data = array(
             'Unqualified function call' => array(
@@ -623,7 +623,7 @@ public function testKeywordsAndOperators($original, $expected)
      *
      * @return array
      */
-    public function dataKeywordsAndOperators()
+    public static function dataKeywordsAndOperators()
     {
         return array(
             'Keywords: instanceof' => array(