feat: move Expectations API out of external plugin

tests/Features/Expect/each.php

@@ -0,0 +1,89 @@
+<?php
+
+use Pest\Expectation;
+
+test('an exception is thrown if the the type is not iterable', function () {
+    expect('Foobar')->each()->toEqual('Foobar');
+})->throws(BadMethodCallException::class, 'Expectation value is not iterable.');
+
+it('expects on each item', function () {
+    expect([1, 1, 1])
+        ->each()
+        ->toEqual(1);
+
+    expect(static::getCount())->toBe(3); // + 1 assertion
+
+    expect([1, 1, 1])
+        ->each
+        ->toEqual(1);
+
+    expect(static::getCount())->toBe(7);
+});
+
+it('chains expectations on each item', function () {
+    expect([1, 1, 1])
+        ->each()
+        ->toBeInt()
+        ->toEqual(1);
+
+    expect(static::getCount())->toBe(6); // + 1 assertion
+
+    expect([2, 2, 2])
+        ->each
+        ->toBeInt
+        ->toEqual(2);
+
+    expect(static::getCount())->toBe(13);
+});
+
+test('opposite expectations on each item', function () {
+    expect([1, 2, 3])
+        ->each()
+        ->not()
+        ->toEqual(4);
+
+    expect(static::getCount())->toBe(3);
+
+    expect([1, 2, 3])
+        ->each()
+        ->not->toBeString;
+
+    expect(static::getCount())->toBe(7);
+});
+
+test('chained opposite and non-opposite expectations', function () {
+    expect([1, 2, 3])
+        ->each()
+        ->not()
+        ->toEqual(4)
+        ->toBeInt();
+
+    expect(static::getCount())->toBe(6);
+});
+
+it('can add expectations via "and"', function () {
+    expect([1, 2, 3])
+        ->each()
+        ->toBeInt // + 3
+        ->and([4, 5, 6])
+        ->each
+        ->toBeLessThan(7) // + 3
+        ->not
+        ->toBeLessThan(3)
+        ->toBeGreaterThan(3) // + 3
+        ->and('Hello World')
+        ->toBeString // + 1
+        ->toEqual('Hello World'); // + 1
+
+    expect(static::getCount())->toBe(14);
+});
+
+it('accepts callables', function () {
+    expect([1, 2, 3])->each(function ($number) {
+        expect($number)->toBeInstanceOf(Expectation::class);
+        expect($number->value)->toBeInt();
+        $number->toBeInt->not->toBeString;
+    });
+
+    expect(static::getCount())->toBe(12);
+});