Assertion Tests & Implementation

src/Testing/TestCase.php

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+<?php
+
+namespace Inertia\Testing;
+
+use Inertia\Testing\TestResponse;
+use Illuminate\Contracts\Console\Kernel;
+use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
+{
+	/**
+	 * Create the test response instance from the given response.
+	 *
+	 * @param  \Illuminate\Http\Response $response
+	 *
+	 * @return \Illuminate\Foundation\Testing\TestResponse
+	 */
+	protected function createTestResponse($response)
+	{
+	    return TestResponse::fromBaseResponse($response);
+	}
+}

src/Testing/TestResponse.php

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+<?php
+
+namespace Inertia\Testing;
+
+use Illuminate\Support\Arr;
+use PHPUnit\Framework\Assert as PHPUnit;
+use Illuminate\Foundation\Testing\TestResponse as BaseResponse;
+
+class TestResponse extends BaseResponse
+{
+	public function assertHasProp($prop)
+	{
+		PHPUnit::assertTrue(Arr::has($this->props(), $prop));
+
+		return $this;
+	}
+
+	public function assertPropValue($prop, $value)
+	{
+		$this->assertHasProp($prop);
+
+		if (is_callable($value)) {
+			$value($this->props($prop));
+		} else {
+			PHPUnit::assertEquals($this->props($prop), $value);
+		}
+
+		return $this;
+	}
+
+	public function assertPropCount($prop, $count)
+	{
+		$this->assertHasProp($prop);
+
+		PHPUnit::assertCount($count, $this->props($prop));
+
+		return $this;
+	}
+
+	public function assertComponent($component)
+	{
+		PHPUnit::assertEquals($component, $this->original['page']['component']);
+
+		return $this;
+	}
+
+	protected function props($key = null)
+	{
+		$props = json_decode(json_encode($this->original['page']['props']), JSON_OBJECT_AS_ARRAY);
+
+		if ($key) {
+			return Arr::get($props, $key);
+		}
+
+		return $props;
+	}
+}

tests/TestResponseTest.php

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+<?php
+
+use Illuminate\Http\Response;
+use Inertia\Testing\TestResponse;
+use PHPUnit\Framework\TestCase;
+
+class TestResponseTest extends TestCase
+{
+    public function test_assert_has_prop()
+    {
+        $response = $this->makeMockResponse([
+        	'prop' => 'value'
+        ]);
+
+        $response->assertHasProp('prop');
+    }
+
+    public function test_assert_prop_value()
+    {
+        $response = $this->makeMockResponse([
+        	'prop' => 'value'
+        ]);
+
+        $response->assertPropValue('prop', 'value');
+    }
+
+    public function test_assert_prop_count()
+    {
+        $response = $this->makeMockResponse([
+        	'prop' => [1, 2, 3],
+        ]);
+
+        $response->assertPropCount('prop', 3);
+    }
+
+    public function test_assert_component()
+    {
+        $response = $this->makeMockResponse();
+
+        $response->assertComponent('mock');
+    }
+
+    private function makeMockResponse($content = [])
+    {
+    	$baseResponse = tap(new Response, function ($response) use ($content) {
+            $response->setContent([
+            	'page' => [
+            		'props' => $content,
+                    'component' => 'mock'
+            	],
+            ]);
+        });
+
+        return TestResponse::fromBaseResponse($baseResponse);
+    }
+}