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diff --git a/www/wiki/extensions/Translate/tests/phpunit/ffs/JavaFFSTest.php b/www/wiki/extensions/Translate/tests/phpunit/ffs/JavaFFSTest.php
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+++ b/www/wiki/extensions/Translate/tests/phpunit/ffs/JavaFFSTest.php
@@ -0,0 +1,91 @@
+<?php
+/**
+ * The JavaFFS class is responsible for loading messages from .properties
+ * files, which are used in many JavaScript and Java projects.
+ * These tests check that the message keys are loaded, mangled and unmangled
+ * correctly.
+ * @author Niklas Laxström
+ * @file
+ */
+
+class JavaFFSTest extends MediaWikiTestCase {
+
+	protected $groupConfiguration = [
+		'BASIC' => [
+			'class' => 'FileBasedMessageGroup',
+			'id' => 'test-id',
+			'label' => 'Test Label',
+			'namespace' => 'NS_MEDIAWIKI',
+			'description' => 'Test description',
+		],
+		'FILES' => [
+			'class' => 'JavaFFS',
+		],
+	];
+
+	public function testParsing() {
+		$file =
+			<<<PROPERTIES
+			# You are reading the ".properties" entry.
+! The exclamation mark can also mark text as comments.
+website = <nowiki>http://en.wikipedia.org/</nowiki>
+language = English
+# The backslash below tells the application to continue reading
+# the value onto the next line.
+message = Welcome to \
+          Wikipedia!
+# Add spaces to the key
+key\ with\ spaces = Value that can be looked up with "key with spaces".
+key-with-{curlies} = Value that can be looked up with "key-with-{curlies}".
+PROPERTIES;
+
+		/**
+		 * @var FileBasedMessageGroup $group
+		 */
+		$group = MessageGroupBase::factory( $this->groupConfiguration );
+		$ffs = new JavaFFS( $group );
+		$parsed = $ffs->readFromVariable( $file );
+		$expected = [
+			'website' => '<nowiki>http://en.wikipedia.org/</nowiki>',
+			'language' => 'English',
+			'message' => 'Welcome to Wikipedia!',
+			'key with spaces' => 'Value that can be looked up with "key with spaces".',
+			// We expect this one to be mangled for storage
+			'key-with-=7Bcurlies=7D' => 'Value that can be looked up with "key-with-{curlies}".',
+		];
+		$expected = [ 'MESSAGES' => $expected, 'AUTHORS' => [] ];
+		$this->assertEquals( $expected, $parsed );
+	}
+
+	/**
+	 * @dataProvider rowValuesProvider
+	 */
+	public function testRowRoundtrip( $key, $sep, $value, $comment ) {
+		$write = JavaFFS::writeRow( $key, $sep, $value );
+		// Trim the trailing newline
+		$write = rtrim( $write );
+		list( $newkey, $newvalue ) = JavaFFS::readRow( $write, $sep );
+
+		$this->assertSame( $key, $newkey, "Key survives roundtrip in testdata: $comment" );
+		$this->assertSame( $value, $newvalue, "Value survives roundtrip in testdata: $comment" );
+	}
+
+	public function rowValuesProvider() {
+		return [
+			[ 'key', '=', 'value', 'simple row' ],
+			[ 'key', ':', 'value', 'row with different sep' ],
+			[ 'key', '=', 'val=ue', 'row with sep inside value' ],
+			[ 'k=ey', '=', 'value', 'row with sep inside key' ],
+			[ '!key', '=', 'value', 'row with ! at the beginning of key' ],
+			[ 'k!ey', '=', 'value', 'row with ! inside key' ],
+			[ '#key', '=', 'value', 'row with # at the beginning of key' ],
+			[ 'k#ey', '=', 'value', 'row with # inside key' ],
+			[ 'k{ey}', '=', 'value', 'row with { and } inside key' ],
+			[ 'k\\tey', '=', 'value\\', 'row with escapes' ],
+			[ '01234', '=', '13.34', 'row with numbers' ],
+			[ '\\n\\tкая', '=', 'кая', 'row with annoying characteres' ],
+			[ '=', '=', '', 'row with empty value' ],
+			[ '#k   e\\=y#', '=', '=v!\\=alue\\ \\\\', 'complex row' ],
+		];
+	}
+}