Skip tests when 'git' command is not available

This change is intended to be a quick-fix to allow the test suite to pass. A
later enhancement would be to move this check to happen at runtime so that if a
user attempts to use one of these affected filters, a suitable error message
and exit code can be used. When that happens, the tests will need to be
reworked to cover that functionality.

Author: fredden

tests/Core/Filters/AbstractFilterTestCase.php

@@ -247,4 +247,30 @@ protected static function mapPathsToRuntimeOs(array $paths)
     }//end mapPathsToRuntimeOs()
 
 
+    /**
+     * Mark the current test as 'skipped' if the 'git' command-line tool is not available.
+     *
+     * @return void
+     */
+    protected function checkGitCommandAvailable()
+    {
+        static $result = null;
+
+        if (is_bool($result) === false) {
+            if (strpos(PHP_OS, 'WIN') === 0) {
+                $test = 'where';
+            } else {
+                $test = 'command -v';
+            }
+
+            $result = is_executable(trim((string) shell_exec("$test git")));
+        }
+
+        if ($result === false) {
+            $this->markTestSkipped('git command not available');
+        }
+
+    }//end checkGitCommandAvailable()
+
+
 }//end class

tests/Core/Filters/GitModifiedTest.php

@@ -219,6 +219,8 @@ public function testExecAlwaysReturnsArray($cmd, $expected)
             $this->markTestSkipped('Not a git repository');
         }
 
+        $this->checkGitCommandAvailable();
+
         $fakeDI = new RecursiveArrayIterator(self::getFakeFileList());
         $filter = new GitModified($fakeDI, '/', self::$config, self::$ruleset);
 

tests/Core/Filters/GitStagedTest.php

@@ -219,6 +219,8 @@ public function testExecAlwaysReturnsArray($cmd, $expected)
             $this->markTestSkipped('Not a git repository');
         }
 
+        $this->checkGitCommandAvailable();
+
         $fakeDI = new RecursiveArrayIterator(self::getFakeFileList());
         $filter = new GitStaged($fakeDI, '/', self::$config, self::$ruleset);