Added unit tests to test if Z0 can be parsed

Author: waltertamboer

src/Lexer/AbstractLexer.php

@@ -54,6 +54,18 @@ public function getNextToken(): ?TokenInterface
             return new TagPair($matches[1], $matches[3]);
         }
 
+        // Match a null move
+        if (preg_match('/^\s*--\s*/', $this->buffer, $matches)) {
+            $this->buffer = substr($this->buffer, strlen($matches[0]));
+            return new NullMove();
+        }
+
+        // Match a null move
+        if (preg_match('/^\s*Z0\s*/', $this->buffer, $matches)) {
+            $this->buffer = substr($this->buffer, strlen($matches[0]));
+            return new NullMove();
+        }
+
         // Match an end result:
         if (preg_match('/^\s*(\*|1-0|0-1|1\/2-1\/2)\s*/', $this->buffer, $matches)) {
             $this->buffer = substr($this->buffer, strlen($matches[0]));
@@ -96,18 +108,6 @@ public function getNextToken(): ?TokenInterface
             return new NumericAnnotationGlyph((int)trim($matches[1]));
         }
 
-        // Match a null move
-        if (preg_match('/^\s*--\s*/', $this->buffer, $matches)) {
-            $this->buffer = substr($this->buffer, strlen($matches[0]));
-            return new NullMove();
-        }
-
-        // Match a null move
-        if (preg_match('/^\s*Z0\s*/', $this->buffer, $matches)) {
-            $this->buffer = substr($this->buffer, strlen($matches[0]));
-            return new NullMove();
-        }
-
         throw InvalidTokenException::createForBuffer($this->buffer);
     }
 

tests/Lexer/AbstractLexerTest.php

@@ -126,7 +126,7 @@ public function testMatchEndResultWhiteWins()
         static::assertEquals('1-0', $result->getResult());
     }
 
-    public function testMatchNullMove()
+    public function testMatchNullMoveWithDashes()
     {
         // Arrange
         $buffer = '--';
@@ -140,6 +140,20 @@ public function testMatchNullMove()
         static::assertInstanceOf(NullMove::class, $result);
     }
 
+    public function testMatchNullMoveWithZ0()
+    {
+        // Arrange
+        $buffer = 'Z0';
+
+        $lexer = new StringLexer($buffer);
+
+        // Act
+        $result = $lexer->getNextToken();
+
+        // Assert
+        static::assertInstanceOf(NullMove::class, $result);
+    }
+
     public function testMoveNumberWhite()
     {
         // Arrange