TextMatcher should not match @null@ inside pattern

src/Coduo/PHPMatcher/Matcher/TextMatcher.php

@@ -79,6 +79,10 @@ public function canMatch($pattern)
             return false;
         }
 
+        if (mb_strlen($pattern) !== 6 && false !== mb_strpos($pattern, '@null@')) {
+            return false;
+        }
+
         return true;
     }
 

tests/Coduo/PHPMatcher/Matcher/TextMatcherTest.php

@@ -37,6 +37,20 @@ public function setUp()
         );
     }
 
+    public function test_can_match_general_strings()
+    {
+        $this->assertTrue($this->matcher->canMatch(''));
+        $this->assertTrue($this->matcher->canMatch('String with text'));
+        $this->assertTrue($this->matcher->canMatch('String with text, @number@ and @*@'));
+    }
+
+    public function test_cannot_match_null_as_part_of_pattern()
+    {
+        $this->assertFalse($this->matcher->canMatch("Using @null@ inside other text"));
+        $this->assertFalse($this->matcher->canMatch("@null@ at start of pattern"));
+        $this->assertFalse($this->matcher->canMatch("pattern ends with @null@"));
+    }
+
     /**
      * @dataProvider matchingData
      */