Add Identifier::toString()

For symmetry with the Name API.

Also add some missing unit tests.

lib/PhpParser/Node/Identifier.php

@@ -33,6 +33,15 @@ class Identifier extends NodeAbstract
         return ['name'];
     }
 
+    /**
+     * Get identifier as string.
+     *
+     * @return string Identifier as string.
+     */
+    public function toString() : string {
+        return $this->name;
+    }
+
     /**
      * Get lowercased identifier as string.
      *

lib/PhpParser/Node/IdentifierTest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace PhpParser\Node;
+
+use PHPUnit\Framework\TestCase;
+
+class IdentifierTest extends TestCase {
+    public function testToString() {
+        $identifier = new Identifier('Foo');
+
+        $this->assertSame('Foo', (string) $identifier);
+        $this->assertSame('Foo', $identifier->toString());
+        $this->assertSame('foo', $identifier->toLowerString());
+    }
+
+    /** @dataProvider provideTestIsSpecialClassName */
+    public function testIsSpecialClassName($identifier, $expected) {
+        $identifier = new Identifier($identifier);
+        $this->assertSame($expected, $identifier->isSpecialClassName());
+    }
+
+    public function provideTestIsSpecialClassName() {
+        return [
+            ['self', true],
+            ['PARENT', true],
+            ['Static', true],
+            ['other', false],
+        ];
+    }
+}

test/PhpParser/Node/NameTest.php

@@ -28,10 +28,11 @@ class NameTest extends TestCase
     }
 
     public function testToString() {
-        $name = new Name('foo\bar');
+        $name = new Name('Foo\Bar');
 
-        $this->assertSame('foo\bar', (string) $name);
-        $this->assertSame('foo\bar', $name->toString());
+        $this->assertSame('Foo\Bar', (string) $name);
+        $this->assertSame('Foo\Bar', $name->toString());
+        $this->assertSame('foo\bar', $name->toLowerString());
     }
 
     public function testSlice() {
@@ -137,4 +138,20 @@ class NameTest extends TestCase
     public function testInvalidArg() {
         Name::concat('foo', new \stdClass);
     }
+
+    /** @dataProvider provideTestIsSpecialClassName */
+    public function testIsSpecialClassName($name, $expected) {
+        $name = new Name($name);
+        $this->assertSame($expected, $name->isSpecialClassName());
+    }
+
+    public function provideTestIsSpecialClassName() {
+        return [
+            ['self', true],
+            ['PARENT', true],
+            ['Static', true],
+            ['self\not', false],
+            ['not\self', false],
+        ];
+    }
 }