feat: move Expectations API out of external plugin

src/Each.php

@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest;
+
+/**
+ * @internal
+ *
+ * @mixin Expectation
+ */
+final class Each
+{
+    /**
+     * @var Expectation
+     */
+    private $original;
+
+    /**
+     * @var bool
+     */
+    private $opposite = false;
+
+    /**
+     * Creates an expectation on each item of the iterable "value".
+     */
+    public function __construct(Expectation $original)
+    {
+        $this->original = $original;
+    }
+
+    /**
+     * Creates a new expectation.
+     *
+     * @param mixed $value
+     */
+    public function and($value): Expectation
+    {
+        return $this->original->and($value);
+    }
+
+    /**
+     * Creates the opposite expectation for the value.
+     */
+    public function not(): Each
+    {
+        $this->opposite = true;
+
+        return $this;
+    }
+
+    /**
+     * Dynamically calls methods on the class with the given arguments on each item.
+     *
+     * @param array<int|string, mixed> $arguments
+     */
+    public function __call(string $name, array $arguments): Each
+    {
+        foreach ($this->original->value as $item) {
+            /* @phpstan-ignore-next-line */
+            $this->opposite ? expect($item)->not()->$name(...$arguments) : expect($item)->$name(...$arguments);
+        }
+
+        $this->opposite = false;
+
+        return $this;
+    }
+
+    /**
+     * Dynamically calls methods on the class without any arguments on each item.
+     */
+    public function __get(string $name): Each
+    {
+        /* @phpstan-ignore-next-line */
+        return $this->$name();
+    }
+}