Fix constant prefix restriction + unit tests

Author: kylekatarnls

src/JsPhpize/Lexer/Scanner.php

@@ -20,7 +20,7 @@ public function scanConstant($matches)
     {
         $constant = trim($matches[0]);
         $constPrefix = $this->engine->getOption('constPrefix', JsPhpize::CONST_PREFIX);
-        if (substr($constant, 0, 5) === $constPrefix) {
+        if (strpos($constant, $constPrefix) === 0) {
             throw new Exception('Constants cannot start with ' . $constPrefix . ', this prefix is reserved for JsPhpize' . $this->exceptionInfos(), 1);
         }
         $translate = array(

tests/options.php

@@ -38,4 +38,18 @@ public function testDisallow()
         }
         $this->assertSame(3, $code);
     }
+
+    /**
+     * @expectedException     \JsPhpize\Lexer\Exception
+     * @expectedExceptionCode 1
+     */
+    public function testConstPrefixRestriction()
+    {
+        $jsPhpize = new JsPhpize(array(
+            'constPrefix' => 'FOO',
+        ));
+        $jsPhpize->render('
+            var a = FOOBAR;
+        ');
+    }
 }