diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7757e20..58b902e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,6 +12,8 @@ jobs:
     steps:
     - name: Check out repository
       uses: actions/checkout@v2
+      with:
+        submodules: true
 
     - name: Set up Deno
       uses: denolib/setup-deno@v2
@@ -19,3 +21,7 @@ jobs:
     - name: build
       run: |
         deno run --allow-all --unstable build.ts
+
+    - name: Test
+      run: |
+        deno run --allow-all --unstable test.ts
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..940a095
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tests"]
+	path = tests
+	url = git@github.com:khronosproject/wasi-test-suite.git
diff --git a/test.ts b/test.ts
new file mode 100644
index 0000000..2cf9a84
--- /dev/null
+++ b/test.ts
@@ -0,0 +1,340 @@
+import {
+  serve,
+} from "https://deno.land/std/http/server.ts";
+
+import {
+  serveFile,
+} from "https://deno.land/std/http/file_server.ts";
+
+const ignore = [
+  "tests/std_env_args_none.wasm",
+  "tests/std_env_args_some.wasm",
+  "tests/std_env_vars_none.wasm",
+  "tests/std_env_vars_some.wasm",
+  "tests/std_fs_create_dir_absolute.wasm",
+  "tests/std_fs_create_dir_relative.wasm",
+  "tests/std_fs_file_create_absolute.wasm",
+  "tests/std_fs_file_create_relative.wasm",
+  "tests/std_fs_file_metadata_absolute.wasm",
+  "tests/std_fs_file_metadata_relative.wasm",
+  "tests/std_fs_file_seek_absolute.wasm",
+  "tests/std_fs_file_seek_relative.wasm",
+  "tests/std_fs_file_set_len_absolute.wasm",
+  "tests/std_fs_file_set_len_relative.wasm",
+  "tests/std_fs_file_sync_all_absolute.wasm",
+  "tests/std_fs_file_sync_all_relative.wasm",
+  "tests/std_fs_file_sync_data_absolute.wasm",
+  "tests/std_fs_file_sync_data_relative.wasm",
+  "tests/std_fs_hard_link_absolute.wasm",
+  "tests/std_fs_hard_link_relative.wasm",
+  "tests/std_fs_metadata_absolute.wasm",
+  "tests/std_fs_metadata_relative.wasm",
+  "tests/std_fs_read_absolute.wasm",
+  "tests/std_fs_read_dir_absolute.wasm",
+  "tests/std_fs_read_dir_relative.wasm",
+  "tests/std_fs_read_relative.wasm",
+  "tests/std_fs_remove_dir_all_absolute.wasm",
+  "tests/std_fs_remove_dir_all_relative.wasm",
+  "tests/std_fs_rename_absolute.wasm",
+  "tests/std_fs_rename_relative.wasm",
+  "tests/std_fs_symlink_metadata_absolute.wasm",
+  "tests/std_fs_symlink_metadata_relative.wasm",
+  "tests/std_fs_write_absolute.wasm",
+  "tests/std_fs_write_relative.wasm",
+  "tests/std_io_stderr.wasm",
+  "tests/std_io_stdin.wasm",
+  "tests/std_io_stdout.wasm",
+  "tests/std_process_exit.wasm",
+  "tests/wasi_clock_res_get_monotonic.wasm",
+  "tests/wasi_clock_res_get_process.wasm",
+  "tests/wasi_clock_res_get_realtime.wasm",
+  "tests/wasi_clock_res_get_thread.wasm",
+  "tests/wasi_clock_time_get_monotonic.wasm",
+  "tests/wasi_clock_time_get_process.wasm",
+  "tests/wasi_clock_time_get_realtime.wasm",
+  "tests/wasi_clock_time_get_thread.wasm",
+  "tests/wasi_fd_write_file.wasm",
+  "tests/wasi_fd_write_stderr.wasm",
+  "tests/wasi_fd_write_stdout.wasm",
+  "tests/wasi_proc_exit_one.wasm",
+  "tests/wasi_proc_exit_zero.wasm",
+  "tests/wasi_random_get.wasm",
+];
+
+const manifest: { [key: string]: unknown } = {};
+for await (const entry of Deno.readDir("tests")) {
+  if (!entry.name.endsWith(".wasm")) {
+    continue;
+  }
+
+  const name = `tests/${entry.name}`;
+  const path = name.replace(/\.wasm$/, ".json");
+  manifest[name] = JSON.parse(await Deno.readTextFile(path));
+}
+
+const server = serve({ port: 8080 });
+
+const browser = await Deno.run({
+  cmd: [
+    chromePath(),
+    ...chromeFlags(),
+    "http://localhost:8080",
+  ],
+  stdout: "null",
+  stderr: "null",
+});
+
+const result: {
+  passed: number;
+  failed: number;
+  ignored: number;
+  errors: string[];
+} = {
+  passed: 0,
+  failed: 0,
+  ignored: 0,
+  errors: [],
+};
+
+for await (const request of server) {
+  try {
+    switch (request.url) {
+      case "/":
+      case "/index.html": {
+        await request.respond(await serveIndex());
+        break;
+      }
+
+      case "/runner.js": {
+        await request.respond(await serveRunner(manifest, ignore));
+        break;
+      }
+
+      case "/favicon.ico": {
+        await request.respond({ body: "" });
+        break;
+      }
+
+      case "/test": {
+        await request.respond({ body: "" });
+        const body = await Deno.readAll(request.body);
+
+        await Deno.writeAll(Deno.stderr, new TextEncoder().encode("test "));
+        await Deno.writeAll(Deno.stderr, body);
+        await Deno.writeAll(Deno.stderr, new TextEncoder().encode("..."));
+        break;
+      }
+
+      case "/pass": {
+        await request.respond({ body: "" });
+        result.passed++;
+
+        await Deno.writeAll(Deno.stderr, new TextEncoder().encode("ok\n"));
+        break;
+      }
+
+      case "/fail": {
+        await request.respond({ body: "" });
+        const body = await Deno.readAll(request.body);
+
+        result.errors.push(new TextDecoder().decode(body));
+        result.failed++;
+
+        await Deno.writeAll(Deno.stderr, new TextEncoder().encode("FAILED\n"));
+        break;
+      }
+
+      case "/skip": {
+        await request.respond({ body: "" });
+        const body = await Deno.readAll(request.body);
+
+        result.ignored++;
+
+        await Deno.writeAll(Deno.stderr, new TextEncoder().encode("ignore\n"));
+        break;
+      }
+
+      default: {
+        const filepath = request.url.slice(1);
+        await request.respond(await serveFile(request, filepath));
+        break;
+      }
+    }
+  } catch (error) {
+    console.error(request.url, error);
+  }
+
+  const pending = Object.keys(manifest).length -
+    result.passed -
+    result.failed -
+    result.ignored;
+
+  if (pending == 0) {
+    break;
+  }
+}
+
+browser.close();
+server.close();
+
+if (result.errors.length > 0) {
+  await Deno.writeAll(
+    Deno.stderr,
+    new TextEncoder().encode(`\n`),
+  );
+
+  for (const error of result.errors) {
+    await Deno.writeAll(
+      Deno.stderr,
+      new TextEncoder().encode(`${error}\n`),
+    );
+  }
+}
+
+await Deno.writeAll(
+  Deno.stderr,
+  new TextEncoder().encode(
+    `\ntest results: ${
+      result.failed ? "FAILED" : "ok"
+    }. ${result.passed} passed; ${result.failed} failed; ignored; ${result.ignored}\n`,
+  ),
+);
+
+if (result.failed) {
+  Deno.exit(1);
+}
+
+async function serveIndex() {
+  const body = `
+  <!DOCTYPE html>
+  <html lang="en">
+  <head>
+  <meta charset="utf-8">
+  <title></title>
+  </head>
+  <body>
+  <script type="module" src="/runner.js"></script>
+  </body>
+  </html>`;
+
+  return {
+    body,
+  };
+}
+
+async function serveRunner(manifest: unknown, ignore: string[]) {
+  const headers = new Headers({
+    "Content-Type": "application/javascript",
+  });
+
+  const body = `
+  import Context from "/lib/wasi_snapshot_preview1.js";
+
+  const manifest = ${JSON.stringify(manifest)};
+  const ignore = ${JSON.stringify(ignore)};
+
+  async function test(name) {
+    return fetch("http://localhost:8080/test", {
+      method: 'POST',
+      body: name,
+    });
+  }
+
+  async function pass() {
+    return fetch("http://localhost:8080/pass", {
+      method: 'POST',
+    });
+  }
+
+  async function fail(error) {
+    return fetch("http://localhost:8080/fail", {
+      method: 'POST',
+      body: error,
+    });
+  }
+
+  async function skip(error) {
+    return fetch("http://localhost:8080/skip", {
+      method: 'POST',
+      body: error,
+    });
+  }
+
+  window.onerror = async function() {
+    write("error");
+  };
+
+  window.onload = async function() {
+    const result = {
+      passed: 0,
+      failed: 0,
+      errors: [],
+    };
+
+    const entries = Object.entries(manifest).sort();
+    for (const [pathname, options] of entries) {
+      await test(pathname);
+
+      if (ignore.includes(pathname)) {
+        await skip();
+	continue;
+      }
+
+      try {
+	const context = new Context({
+	});
+
+	const request = await fetch(pathname);
+	const binary = await request.arrayBuffer();
+	const module = await WebAssembly.compile(binary);
+	const instance = await WebAssembly.instantiate(module, {
+	  wasi_snapshot_preview1: context.exports,
+	});
+
+	instance.exports._start();
+	await pass();
+      } catch (error) {
+        await fail(error.stack);
+      }
+    }
+  };`;
+
+  return {
+    headers,
+    body,
+  };
+}
+
+function chromePath() {
+  switch (Deno.build.os) {
+    case "darwin":
+      return "/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome";
+
+    case "linux":
+      return "/usr/bin/google-chrome";
+
+    case "windows":
+      return "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe";
+  }
+}
+
+function chromeFlags(): string[] {
+  return [
+    "--headless",
+    "--remote-debugging-port=9292",
+    "--disable-features=TranslateUI",
+    "--disable-extensions",
+    "--disable-component-extensions-with-background-pages",
+    "--disable-background-networking",
+    "--disable-sync",
+    "--metrics-recording-only",
+    "--disable-default-apps",
+    "--mute-audio",
+    "--no-default-browser-check",
+    "--no-first-run",
+    "--disable-backgrounding-occluded-windows",
+    "--disable-renderer-backgrounding",
+    "--disable-background-timer-throttling",
+    "--force-fieldtrials=*BackgroundTracing/default/",
+  ];
+}
diff --git a/tests b/tests
new file mode 160000
index 0000000..b32e8a1
--- /dev/null
+++ b/tests
@@ -0,0 +1 @@
+Subproject commit b32e8a128a75db1e269059a96e90308c33a365d2