diff --git a/tests/engines/LuaCommon/LuaEnvironmentComparisonTest.php b/tests/engines/LuaCommon/LuaEnvironmentComparisonTest.php
new file mode 100644
index 00000000..7c18e1ee
--- /dev/null
+++ b/tests/engines/LuaCommon/LuaEnvironmentComparisonTest.php
@@ -0,0 +1,103 @@
+<?php
+
+class Scribunto_LuaEnvironmentComparisonTest extends MediaWikiTestCase {
+	var $sandboxOpts = array(
+		'memoryLimit' => 50000000,
+		'cpuLimit' => 30,
+		'allowEnvFuncs' => true,
+	);
+	var $standaloneOpts = array(
+		'errorFile' => null,
+		'luaPath' => null,
+		'memoryLimit' => 50000000,
+		'cpuLimit' => 30,
+		'allowEnvFuncs' => true,
+	);
+
+	protected $engines = array();
+
+	function setUp() {
+		parent::setUp();
+
+		$parser = new Parser;
+		$options = new ParserOptions;
+		$options->setTemplateCallback( array( $this, 'templateCallback' ) );
+		$parser->startExternalParse( Title::newMainPage(), $options, Parser::OT_HTML, true );
+
+		try {
+			$engine = new Scribunto_LuaSandboxEngine(
+				array( 'parser' => $parser ) + $this->sandboxOpts
+			);
+			$engine->getInterpreter();
+			$this->engines['LuaSandbox'] = $engine;
+		} catch ( Scribunto_LuaInterpreterNotFoundError $e ) {
+			$this->markTestSkipped( "LuaSandbox interpreter not available" );
+			return;
+		}
+
+		try {
+			$engine = new Scribunto_LuaStandaloneEngine(
+				array( 'parser' => $parser ) + $this->standaloneOpts
+			);
+			$engine->getInterpreter();
+			$this->engines['LuaStandalone'] = $engine;
+		} catch ( Scribunto_LuaInterpreterNotFoundError $e ) {
+			$this->markTestSkipped( "LuaStandalone interpreter not available" );
+			return;
+		}
+	}
+
+	function tearDown() {
+		foreach ( $this->engines as $engine ) {
+			$engine->destroy();
+		}
+		$this->engines = array();
+		parent::tearDown();
+	}
+
+	private function getGlobalEnvironment( $engine ) {
+		static $script = <<<LUA
+			xxxseen = {}
+			function xxxGetTable( t )
+				if xxxseen[t] then
+					return xxxseen[t]
+				end
+				local ret = {}
+				xxxseen[t] = ret
+				for k, v in pairs( t ) do
+					if k ~= '_G' and string.sub( k, 1, 3 ) ~= 'xxx' then
+						if type( v ) == 'table' then
+							ret[k] = xxxGetTable( v )
+						elseif type( v ) == 'string'
+							or type( v ) == 'number'
+							or type( v ) == 'boolean'
+							or type( v ) == 'nil'
+						then
+							ret[k] = v
+						else
+							ret[k] = type( v )
+						end
+					end
+				end
+				return ret
+			end
+			return xxxGetTable( _G )
+LUA;
+		$func = $engine->getInterpreter()->loadString( $script, 'script' );
+		return $engine->getInterpreter()->callFunction( $func );
+	}
+
+	function testGlobalEnvironment() {
+		// Grab the first engine as the "standard"
+		reset( $this->engines );
+		list( $firstName, $firstEngine ) = each( $this->engines );
+		$firstEnv = $this->getGlobalEnvironment( $firstEngine );
+
+		// Test all others against it
+		while ( list( $secondName, $secondEngine ) = each( $this->engines ) ) {
+			$secondEnv = $this->getGlobalEnvironment( $secondEngine );
+			$this->assertEquals( $firstEnv, $secondEnv,
+				"Environments for $firstName and $secondName are not equivalent" );
+		}
+	}
+}