Adds expect extend

tests/.snapshots/success.txt

@@ -2,6 +2,12 @@
    PASS  Tests\CustomTestCase\ExecutedTest
   ✓ that gets executed
 
+   PASS  Tests\Expect\extend
+  ✓ it macros true is true
+  ✓ it macros false is not true
+  ✓ it macros true is true with argument
+  ✓ it macros false is not true with argument
+
    PASS  Tests\Expect\not
   ✓ not property calls
 
@@ -404,5 +410,5 @@
   ✓ depends run test only once
   ✓ depends works with the correct test name
 
-  Tests:  7 skipped, 238 passed
+  Tests:  7 skipped, 242 passed
   

tests/Expect/extend.php

@@ -0,0 +1,29 @@
+<?php
+
+expect()->extend('toBeAMacroExpectation', function () {
+    $this->toBeTrue();
+
+    return $this;
+});
+
+expect()->extend('toBeAMacroExpectationWithArguments', function (bool $value) {
+    $this->toBe($value);
+
+    return $this;
+});
+
+it('macros true is true', function () {
+    expect(true)->toBeAMacroExpectation();
+});
+
+it('macros false is not true', function () {
+    expect(false)->not->toBeAMacroExpectation();
+});
+
+it('macros true is true with argument', function () {
+    expect(true)->toBeAMacroExpectationWithArguments(true);
+});
+
+it('macros false is not true with argument', function () {
+    expect(false)->not->toBeAMacroExpectationWithArguments(true);
+});