Genie::provision()

src/Genie.php

@@ -91,6 +91,20 @@ public function construct(string $target, ...$pool)
         return new $target(...$this->resolveArguments($target, ...$pool));
     }
 
+    /**
+     * Inspect the given target and return an iterable list of arguments
+     * usable for invoking/constructing the target (using argument unpacking, the splat operator).
+     * Does not invoke/construct the target.
+     *
+     * @param callable|string $target
+     * @param mixed ...$pool
+     * @return iterable
+     */
+    public function provision($target, ...$pool): iterable
+    {
+        return $this->resolveArguments($target, ...$pool);
+    }
+
     /**
      * Provide services without directly exposing them.
      * Returns a fellow invoker with the requested services provisioned.

tests/GenieCoreTest.php

@@ -15,6 +15,19 @@ class GenieCoreTest extends TestCase
 {
     use WithStuff;
 
+    public function testGenieProvisionsCallArguments()
+    {
+        $g = new Genie($c = new Sleeve([
+            Frog::class => new Frog(),
+        ]));
+        $f1 = function (Frog $frog, int $answer) {
+        };
+        $args = $g->provision($f1, 42);
+        $this->assertSame($c[Frog::class], $args[0]);
+        $this->assertSame(42, $args[1]);
+        $this->assertCount(2, $args);
+    }
+
     public function testGenieUsesACoreProperlyPassingArguments()
     {
         $passed = [];

tests/GenieProvisioningTest.php

@@ -26,7 +26,7 @@ public function testProvideReturnsASimpleton()
         $this->assertTrue($wg->provide() instanceof Simpleton);
     }
 
-    public function testProvisioning()
+    public function testGenieProvidesServices()
     {
         $sleeve = ContainerProvider::createContainer();
         $wg = new Genie($sleeve);