feat: move Expectations API out of external plugin

tests/Features/Expect/toEndWith.php

@@ -0,0 +1,15 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect('username')->toEndWith('name');
+});
+
+test('failures', function () {
+    expect('username')->toEndWith('password');
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect('username')->not->toEndWith('name');
+})->throws(ExpectationFailedException::class);