feat: move Expectations API out of external plugin

tests/Features/Expect/toMatchArray.php

@@ -0,0 +1,31 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+beforeEach(function () {
+    $this->user = [
+        'id'    => 1,
+        'name'  => 'Nuno',
+        'email' => 'enunomaduro@gmail.com',
+    ];
+});
+
+test('pass', function () {
+    expect($this->user)->toMatchArray([
+        'name'  => 'Nuno',
+        'email' => 'enunomaduro@gmail.com',
+    ]);
+});
+
+test('failures', function () {
+    expect($this->user)->toMatchArray([
+        'name'  => 'Not the same name',
+        'email' => 'enunomaduro@gmail.com',
+    ]);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect($this->user)->not->toMatchArray([
+        'id' => 1,
+    ]);
+})->throws(ExpectationFailedException::class);