Adds tap for Higher Order tests

tests/Features/HigherOrderTests.php

@@ -1,5 +1,7 @@
 <?php
 
+use PHPUnit\Framework\TestCase;
+
 beforeEach()->assertTrue(true);
 
 it('proxies calls to object')->assertTrue(true);
@@ -8,7 +10,14 @@ it('is capable doing multiple assertions')
     ->assertTrue(true)
     ->assertFalse(false);
 
-//it('can tap into the test')
+it('can tap into the test')
+    ->expect('foo')->toBeString()->toBe('foo')
+    ->tap(function () { expect($this)->toBeInstanceOf(TestCase::class); })
+    ->and('hello world')->toBeString();
 
+it('can use the returned instance from a tap')
+    ->expect('foo')->toBeString()->toBe('foo')
+    ->tap(function () { return expect($this); })
+    ->toBeInstanceOf(TestCase::class);
 
 afterEach()->assertTrue(true);