Test to ensure less can parse the @import rewritten by css_loadfile()

This test is horrible, but I believe necessary to ensure that the
@import of less files actually works.

It is horrible as its not a unit test and its not a true functional
test.  It probably implies the code in css_out() should be refactored
to make it easier to test intermediate results.

_test/tests/lib/exe/css_at_import_less.test.php

+<?php
+
+require_once DOKU_INC.'lib/exe/css.php';
+
+class css_at_import_less_test extends DokuWikiTest {
+
+    protected $file = '';
+    protected $import = '';
+
+    public function setUpFiles($subdir = '') {
+
+        $dir = TMP_DIR . $subdir;
+        if (!is_dir($dir)) {
+            mkdir($dir, 0777, true);
+        }
+        if (!is_dir($dir)) {
+            $this->markTestSkipped('Could not create directory.');
+        }
+
+        $this->file = tempnam($dir, 'css');
+
+        $import = '';
+        do {
+            if ($import) unlink($import);
+            $import = tempnam($dir, 'less');
+            $ok = rename($import, $import.'.less');
+        } while (!$ok);
+
+        $this->import = $import.'.less';
+    }
+
+    private function csstest($input, $expected_css, $expected_less) {
+        $location = "http://test.com/";
+        io_saveFile($this->file, $input);
+        $css = css_loadfile($this->file, $location);
+        $less = css_parseless($css);
+        $this->assertEquals($expected_css, $css);
+        $this->assertEquals($expected_less, $less);
+    }
+
+    public function test_basic() {
+        $this->setUpFiles();
+
+        $import = preg_replace('#(^.*[/])#','',$this->import);
+        $in_css = '@import "'.$import.'";';
+        $in_less = '@foo: "bar";
+content: @foo;';
+
+        $expected_css = '@import "/'.$import.'";';
+        $expected_less = 'content: "bar";';
+
+        io_saveFile($this->import, $in_less);
+        $this->csstest($in_css, $expected_css, $expected_less);
+    }
+
+    public function test_subdirectory() {
+        $this->setUpFiles('/foo/bar');
+
+        $import = preg_replace('#(^.*[/])#','',$this->import);
+        $in_css = '@import "'.$import.'";';
+        $in_less = '@foo: "bar";
+content: @foo;';
+
+        $expected_css = '@import "/foo/bar/'.$import.'";';
+        $expected_less = 'content: "bar";';
+
+        io_saveFile($this->import, $in_less);
+        $this->csstest($in_css, $expected_css, $expected_less);
+    }
+
+    public function tearDown() {
+        unlink($this->file);
+        unlink($this->import);
+        unset($this->file, $this->import);
+    }
+}
+
+//Setup VIM: ex: et ts=4 sw=4 :