CacheFilter test coverage

tests/unit/framework/filters/HttpCacheTest.php

+<?php
+
+namespace yiiunit\framework\filters;
+
+use Yii;
+use yii\filters\HttpCache;
+
+/**
+ * @group filters
+ */
+class HttpCacheTest extends \yiiunit\TestCase
+{
+    protected function setUp()
+    {
+        parent::setUp();
+
+        $_SERVER['SCRIPT_FILENAME'] = "/index.php";
+        $_SERVER['SCRIPT_NAME'] = "/index.php";
+
+        $this->mockWebApplication();
+    }
+
+    public function testDisabled()
+    {
+        $httpCache = new HttpCache;
+        $this->assertTrue($httpCache->beforeAction(null));
+        $httpCache->enabled=false;
+        $this->assertTrue($httpCache->beforeAction(null));
+    }
+
+    /**
+     * @covers HttpCache::validateCache
+     */
+    public function testValidateCache()
+    {
+        $httpCache = new HttpCache;
+        $method = new \ReflectionMethod($httpCache, 'validateCache');
+        $method->setAccessible(true);
+
+        $this->assertFalse($method->invoke($httpCache, null, null));
+
+        $_SERVER['HTTP_IF_MODIFIED_SINCE'] = 'Thu, 01 Jan 1970 00:00:00 GMT';
+        $this->assertTrue($method->invoke($httpCache, 0, null));
+        $this->assertFalse($method->invoke($httpCache, 1, null));
+
+        $_SERVER['HTTP_IF_NONE_MATCH'] = '"foo"';
+        $this->assertTrue($method->invoke($httpCache, 0, '"foo"'));
+        $this->assertTrue($method->invoke($httpCache, 1, '"foo"'));
+        $this->assertFalse($method->invoke($httpCache, null, null));
+    }
+
+    /**
+     * @covers HttpCache::generateEtag
+     */
+    public function testGenerateEtag()
+    {
+        $httpCache = new HttpCache;
+        $httpCache->etagSeed = function($action, $params) {
+            return '';
+        };
+        $httpCache->beforeAction(null);
+        $response = Yii::$app->getResponse();
+
+        $this->assertTrue($response->getHeaders()->offsetExists('ETag'));
+
+        $etag = $response->getHeaders()->get('ETag');
+        $this->assertStringStartsWith('"', $etag);
+        $this->assertStringEndsWith('"', $etag);
+    }
+}
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