Don't run redundant tests

io_deleteFromFile is a special case of io_replaceInFile. Since
the io_replace tests check compressed files, it doesn't have to
be done in the io_delete test.

_test/tests/inc/io_deletefromfile.test.php

@@ -2,25 +2,8 @@
 
 class io_deletefromfile_test extends DokuWikiTest {
 
-    /*
-     * dependency for tests needing zlib extension to pass
-     */
-    public function test_ext_zlib() {
-        if (!extension_loaded('zlib')) {
-            $this->markTestSkipped('skipping all zlib tests.  Need zlib extension');
-        }
-    }
-
-    /*
-     * dependency for tests needing zlib extension to pass
-     */
-    public function test_ext_bz2() {
-        if (!extension_loaded('bz2')) {
-            $this->markTestSkipped('skipping all bzip2 tests.  Need bz2 extension');
-        }
-    }
-
-    function _write($file){
+    function test_delete(){
+        $file = TMP_DIR.'/test.txt';
         $contents = "The\012Delete\012Delete01\012Delete02\012Delete\012DeleteX\012Test\012";
         io_saveFile($file, $contents);
         $this->assertTrue(io_deleteFromFile($file, "Delete\012"));
@@ -29,22 +12,4 @@ class io_deletefromfile_test extends DokuWikiTest {
         $this->assertEquals("The\012DeleteX\012Test\012", io_readFile($file));
     }
 
-    function test_delete(){
-        $this->_write(TMP_DIR.'/test.txt');
-    }
-
-    /**
-     * @depends test_ext_zlib
-     */
-    function test_gzwrite(){
-        $this->_write(TMP_DIR.'/test.txt.gz');
-    }
-
-    /**
-     * @depends test_ext_bz2
-     */
-    function test_bzwrite(){
-        $this->_write(TMP_DIR.'/test.txt.bz2');
-    }
-
 }