Adding tests for Debugger::outputAs()

Adding exceptions for invalid state checking.

lib/Cake/Test/Case/Utility/DebuggerTest.php

@@ -196,6 +196,26 @@ public function testChangeOutputFormats() {
 		$this->assertTags($result, $data, true);
 	}
 
+/**
+ * Test that outputAs works.
+ *
+ * @return void
+ */
+	public function testOutputAs() {
+		Debugger::outputAs('html');
+		$this->assertEquals('html', Debugger::outputAs());
+	}
+
+/**
+ * Test that choosing a non-existant format causes an exception
+ *
+ * @expectedException CakeException
+ * @return void
+ */
+	public function testOutputAsException() {
+		Debugger::outputAs('Invalid junk');
+	}
+
 /**
  * testTrimPath method
  *

lib/Cake/Utility/Debugger.php

@@ -93,7 +93,8 @@ class Debugger {
 		),
 		'base' => array(
 			'traceLine' => '{:reference} - {:path}, line {:line}'
-		)
+		),
+		'log' => array(),
 	);
 
 /**
@@ -558,13 +559,17 @@ protected static function _object($var) {
  *
  * @param string $format The format you want errors to be output as.
  *   Leave null to get the current format.
- * @return void
+ * @return mixed Returns null when setting.  Returns the current format when getting.
+ * @throws CakeException when choosing a format that doesn't exist.
  */
 	public static function outputAs($format = null) {
 		$self = Debugger::getInstance();
 		if ($format === null) {
 			return $self->_outputFormat;
 		}
+		if ($format !== false && !isset($self->_templates[$format])) {
+			throw new CakeException(__d('cake_dev', 'Invalid Debugger output format.'));
+		}
 		$self->_outputFormat = $format;
 	}
 
@@ -641,7 +646,6 @@ public function output($format = null, $strings = array()) {
 			$format = false;
 		}
 		Debugger::outputAs($format);
-
 		return $data;
 	}