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diff --git a/tests/phpunit/includes/libs/CSSMinTest.php b/tests/phpunit/includes/libs/CSSMinTest.php
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+++ b/tests/phpunit/includes/libs/CSSMinTest.php
@@ -0,0 +1,133 @@
+<?php
+/**
+ * This file test the CSSMin library shipped with Mediawiki.
+ *
+ * @author Timo Tijhof
+ */
+
+class CSSMinTest extends MediaWikiTestCase {
+
+	protected function setUp() {
+		parent::setUp();
+
+		$server = 'http://doc.example.org';
+
+		$this->setMwGlobals( array(
+			'wgServer' => $server,
+			'wgCanonicalServer' => $server,
+		) );
+	}
+
+	/**
+	 * @dataProvider provideMinifyCases
+	 */
+	function testMinify( $code, $expectedOutput ) {
+		$minified = CSSMin::minify( $code );
+
+		$this->assertEquals( $expectedOutput, $minified, 'Minified output should be in the form expected.' );
+	}
+
+	function provideMinifyCases() {
+		return array(
+			// Whitespace
+			array( "\r\t\f \v\n\r", "" ),
+			array( "foo, bar {\n\tprop: value;\n}", "foo,bar{prop:value}" ),
+
+			// Loose comments
+			array( "/* foo */", "" ),
+			array( "/*******\n foo\n *******/", "" ),
+			array( "/*!\n foo\n */", "" ),
+
+			// Inline comments in various different places
+			array( "/* comment */foo, bar {\n\tprop: value;\n}", "foo,bar{prop:value}" ),
+			array( "foo/* comment */, bar {\n\tprop: value;\n}", "foo,bar{prop:value}" ),
+			array( "foo,/* comment */ bar {\n\tprop: value;\n}", "foo,bar{prop:value}" ),
+			array( "foo, bar/* comment */ {\n\tprop: value;\n}", "foo,bar{prop:value}" ),
+			array( "foo, bar {\n\t/* comment */prop: value;\n}", "foo,bar{prop:value}" ),
+			array( "foo, bar {\n\tprop: /* comment */value;\n}", "foo,bar{prop:value}" ),
+			array( "foo, bar {\n\tprop: value /* comment */;\n}", "foo,bar{prop:value }" ),
+			array( "foo, bar {\n\tprop: value; /* comment */\n}", "foo,bar{prop:value; }" ),
+
+			// Keep track of things that aren't as minified as much as they
+			// could be (bug 35493)
+			array( 'foo { prop: value ;}', 'foo{prop:value }' ),
+			array( 'foo { prop : value; }', 'foo{prop :value}' ),
+			array( 'foo { prop: value ; }', 'foo{prop:value }' ),
+			array( 'foo { font-family: "foo" , "bar"; }', 'foo{font-family:"foo" ,"bar"}' ),
+			array( "foo { src:\n\turl('foo') ,\n\turl('bar') ; }", "foo{src:url('foo') ,url('bar') }" ),
+
+			// Interesting cases with string values
+			// - Double quotes, single quotes
+			array( 'foo { content: ""; }', 'foo{content:""}' ),
+			array( "foo { content: ''; }", "foo{content:''}" ),
+			array( 'foo { content: "\'"; }', 'foo{content:"\'"}' ),
+			array( "foo { content: '\"'; }", "foo{content:'\"'}" ),
+			// - Whitespace in string values
+			array( 'foo { content: " "; }', 'foo{content:" "}' ),
+		);
+	}
+
+	/**
+	 * @dataProvider provideRemapCases
+	 */
+	function testRemap( $message, $params, $expectedOutput ) {
+		$remapped = call_user_func_array( 'CSSMin::remap', $params );
+
+		$messageAdd = " Case: $message";
+		$this->assertEquals( $expectedOutput, $remapped, 'CSSMin::remap should return the expected url form.' . $messageAdd );
+	}
+
+	function provideRemapCases() {
+		// Parameter signature:
+		// CSSMin::remap( $code, $local, $remote, $embedData = true )
+		return array(
+			array(
+				'Simple case',
+				array( 'foo { prop: url(bar.png); }', false, 'http://example.org', false ),
+				'foo { prop: url(http://example.org/bar.png); }',
+			),
+			array(
+				'Without trailing slash',
+				array( 'foo { prop: url(../bar.png); }', false, 'http://example.org/quux', false ),
+				'foo { prop: url(http://example.org/quux/../bar.png); }',
+			),
+			array(
+				'With trailing slash on remote (bug 27052)',
+				array( 'foo { prop: url(../bar.png); }', false, 'http://example.org/quux/', false ),
+				'foo { prop: url(http://example.org/quux/../bar.png); }',
+			),
+			array(
+				'Guard against stripping double slashes from query',
+				array( 'foo { prop: url(bar.png?corge=//grault); }', false, 'http://example.org/quux/', false ),
+				'foo { prop: url(http://example.org/quux/bar.png?corge=//grault); }',
+			),
+			array(
+				'Expand absolute paths',
+				array( 'foo { prop: url(/w/skin/images/bar.png); }', false, 'http://example.org/quux', false ),
+				'foo { prop: url(http://doc.example.org/w/skin/images/bar.png); }',
+			),
+		);
+	}
+
+	/**
+	 * Seperated because they are currently broken (bug 35492)
+	 *
+	 * @group Broken
+	 * @dataProvider provideStringCases
+	 */
+	function testMinifyWithCSSStringValues( $code, $expectedOutput ) {
+		$this->testMinifyOutput( $code, $expectedOutput );
+	}
+
+	function provideStringCases() {
+		return array(
+			// String values should be respected
+			// - More than one space in a string value
+			array( 'foo { content: "  "; }', 'foo{content:"  "}' ),
+			// - Using a tab in a string value (turns into a space)
+			array( "foo { content: '\t'; }", "foo{content:'\t'}" ),
+			// - Using css-like syntax in string values
+			array( 'foo::after { content: "{;}"; position: absolute; }', 'foo::after{content:"{;}";position:absolute}' ),
+		);
+	}
+}