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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Browser tests for the RendererSideContentDecoding feature, specifically
// testing scenarios involving successful decoding and simulated failures during
// data pipe creation.
#include <string_view>
#include "base/test/scoped_feature_list.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
#include "content/public/test/content_browser_test.h"
#include "content/public/test/content_browser_test_utils.h"
#include "content/shell/browser/shell.h"
#include "services/network/public/cpp/features.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
// Test fixture for RendererSideContentDecoding browser tests.
// Parameterized to run tests in two modes:
// - ExpectSuccess (true): Normal operation, Mojo data pipe creation succeeds.
// - ExpectFail (false): Simulates Mojo data pipe creation failure using the
// `RendererSideContentDecodingForceMojoFailureForTesting` feature parameter.
class RendererSideContentDecodingBrowserTest
: public ContentBrowserTest,
public ::testing::WithParamInterface<bool> {
public:
RendererSideContentDecodingBrowserTest() {
// Enable the main feature and optionally the failure simulation parameter
// based on the test parameter (`GetParam()`).
features_.InitWithFeaturesAndParameters(
{{network::features::kRendererSideContentDecoding,
{{"RendererSideContentDecodingForceMojoFailureForTesting",
ShouldSucceed() ? "false" : "true"}}}},
{});
}
~RendererSideContentDecodingBrowserTest() override = default;
// Provides human-readable names for the test parameter values.
static std::string DescribeParams(
const testing::TestParamInfo<ParamType>& info) {
return info.param ? "ExpectSuccess" : "ExpectFail";
}
protected:
// Starts the embedded test server and navigates the shell to a simple page.
void StartServerAndNavigateToTestPage() {
ASSERT_TRUE(embedded_test_server()->Start());
EXPECT_TRUE(
NavigateToURL(shell(), embedded_test_server()->GetURL("/hello.html")));
}
// Returns true if the current test parameter expects success (no simulated
// failure), false otherwise.
bool ShouldSucceed() const { return GetParam(); }
private:
base::test::ScopedFeatureList features_;
};
INSTANTIATE_TEST_SUITE_P(
/* No prefix */,
RendererSideContentDecodingBrowserTest,
// Run with both true (ExpectSuccess) and false (ExpectFail).
::testing::Bool(),
&RendererSideContentDecodingBrowserTest::DescribeParams);
// Tests loading a compressed Javascript file (.js.gz).
// In ExpectSuccess mode, the script should execute.
// In ExpectFail mode, the script load should fail, triggering the 'error'
// event, and a specific error message should be logged to the console.
IN_PROC_BROWSER_TEST_P(RendererSideContentDecodingBrowserTest,
CompressedScriptLoad) {
StartServerAndNavigateToTestPage();
// Watch for console errors related to resource loading.
DevToolsInspectorLogWatcher log_watcher(shell()->web_contents());
const std::string_view script = R"(
new Promise(resolve => {
window.resolveTest = resolve;
const script = document.createElement('script');
script.src = './loader/compressed.js.gz';
script.addEventListener('error', () => {resolve('load error')});
document.body.appendChild(script);
});
)";
// compressed.js.gz contains: window.resolveTest('script executed');
EXPECT_EQ(ShouldSucceed() ? "script executed" : "load error",
EvalJs(shell(), script));
log_watcher.FlushAndStopWatching();
// Verify the console message in case of failure.
EXPECT_EQ(log_watcher.last_message(),
ShouldSucceed()
? ""
: "Failed to load resource: net::ERR_INSUFFICIENT_RESOURCES");
}
// Tests navigating to a compressed HTML file (.html.gz).
// In ExpectSuccess mode, the navigation should complete, and the page title
// should be set correctly.
// In ExpectFail mode, the navigation should fail, and a specific error message
// ("Failed to decode content") should be logged to the console by
// RenderFrameImpl.
IN_PROC_BROWSER_TEST_P(RendererSideContentDecodingBrowserTest,
CompressedPageNavigation) {
StartServerAndNavigateToTestPage();
// compressed.html.gz contains: <title>page loaded</title>
std::u16string expected_title(u"page loaded");
TitleWatcher title_watcher(shell()->web_contents(), expected_title);
// Watch for the specific console error message logged on navigation failure.
WebContentsConsoleObserver console_observer(shell()->web_contents());
console_observer.SetPattern("Failed to decode content");
// Initiate navigation to the compressed HTML file.
EXPECT_TRUE(ExecJs(shell(), JsReplace("window.location.href = $1",
"./loader/compressed.html.gz")));
if (ShouldSucceed()) {
// Wait for the title change to confirm successful navigation and decoding.
EXPECT_EQ(expected_title, title_watcher.WaitAndGetTitle());
} else {
// Wait for the expected console error message.
ASSERT_TRUE(console_observer.Wait());
}
}
} // namespace content
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