Add Cascade::hasLogger() (theorchard#100)

src/Cascade.php

@@ -87,6 +87,18 @@ public static function logger($name)
         return self::getLogger($name);
     }
 
+    /**
+     * Checks if a logger with given name already exists.
+     *
+     * @param string $name Name of the requested Logger instance
+     *
+     * @return bool true - Logger already exists; false - Logger does not exist
+     */
+    public static function hasLogger($name)
+    {
+        return Registry::hasLogger($name);
+    }
+
     /**
      * Return the config options
      *

tests/CascadeTest.php

@@ -82,4 +82,12 @@ public function testLoadConfigFromStringWithYaml()
         Cascade::loadConfigFromString($yamlConfig);
         $this->assertInstanceOf('Cascade\Config', Cascade::getConfig());
     }
+
+    public function testHasLogger()
+    {
+        // implicitly create logger "existing"
+        Cascade::logger('existing');
+        $this->assertFalse(Cascade::hasLogger('not_existing'));
+        $this->assertTrue(Cascade::hasLogger('existing'));
+    }
 }