feat(expect): adds toBe

src/Expectation.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest;
+
+use PHPUnit\Framework\Assert;
+
+/**
+ * @internal
+ *
+ * @property Expectation $not Creates the opposite expectation.
+ */
+final class Expectation
+{
+    /**
+     * The expectation value.
+     *
+     * @var mixed
+     */
+    private $value;
+
+    /**
+     * Creates a new expectation.
+     *
+     * @param mixed $value
+     */
+    public function __construct($value)
+    {
+        $this->value = $value;
+    }
+
+    /**
+     * Creates the opposite expectation for the value.
+     */
+    public function not(): OppositeExpectation
+    {
+        return new OppositeExpectation($this);
+    }
+
+    /**
+     * Asserts that two variables have the same type and
+     * value. Used on objects, it asserts that two
+     * variables reference the same object.
+     *
+     * @param mixed $value
+     */
+    public function toBe($value): Expectation
+    {
+        Assert::assertSame($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Dynamically calls methods on the class without any arguments.
+     *
+     * @return Expectation
+     */
+    public function __get(string $name)
+    {
+        /* @phpstan-ignore-next-line */
+        return $this->{$name}();
+    }
+}

src/OppositeExpectation.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest;
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+/**
+ * @internal
+ *
+ * @mixin Expectation
+ */
+final class OppositeExpectation
+{
+    /**
+     * @var Expectation
+     */
+    private $original;
+
+    /**
+     * Creates a new opposite expectation.
+     */
+    public function __construct(Expectation $original)
+    {
+        $this->original = $original;
+    }
+
+    /**
+     * Handle dynamic method calls into the original expectation.
+     *
+     * @param array<int, mixed> $arguments
+     */
+    public function __call(string $name, array $arguments): Expectation
+    {
+        try {
+            /* @phpstan-ignore-next-line */
+            $this->original->{$name}(...$arguments);
+        } catch (ExpectationFailedException $e) {
+            return $this->original;
+        }
+
+        throw new ExpectationFailedException(sprintf('@todo'));
+    }
+}

src/globals.php

@@ -3,6 +3,7 @@
 declare(strict_types=1);
 
 use Pest\Datasets;
+use Pest\Expectation;
 use Pest\PendingObjects\AfterEachCall;
 use Pest\PendingObjects\BeforeEachCall;
 use Pest\PendingObjects\TestCall;
@@ -104,3 +105,11 @@ function afterAll(Closure $closure = null): void
 {
     TestSuite::getInstance()->afterAll->set($closure);
 }
+
+/**
+ * Creates a new expectation.
+ */
+function expect($value): Expectation
+{
+    return new Expectation($value);
+}

tests/.snapshots/success.txt

@@ -2,6 +2,11 @@
    PASS  Tests\CustomTestCase\ExecutedTest
   ✓ that gets executed
 
+   PASS  Tests\Expect\ToBe
+  ✓ strict comparisons
+  ✓ failures
+  ✓ not failures
+
    PASS  Tests\Features\AfterAll
   ✓ deletes file after all
 
@@ -167,5 +172,5 @@
    WARN  Tests\Visual\Success
   - visual snapshot of test suite on success
 
-  Tests:  6 skipped, 96 passed
-  Time:   3.43s
+  Tests:  6 skipped, 99 passed
+  Time:   3.62s

tests/Expect/ToBe.php

@@ -0,0 +1,19 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('strict comparisons', function () {
+    $nuno = new stdClass();
+    $dries = new stdClass();
+
+    expect($nuno)->toBe($nuno);
+    expect($nuno)->not->toBe($dries);
+});
+
+test('failures', function () {
+    expect(1)->toBe(2);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(1)->not->toBe(1);
+})->throws(ExpectationFailedException::class);