Port FormData tests from internal to workerd (cloudflare#1355)

src/workerd/api/tests/form-data-legacy-test.js

@@ -0,0 +1,58 @@
+export const sendFilesInFormdata = {
+  async test() {
+    const INPUT = `--2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a
+Content-Disposition: form-data; name="foo"; filename="foo.txt"
+Content-Type: application/octet-stream
+
+foo-content
+--2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a
+Content-Disposition: form-data; name="bar"; filename="bar-renamed.txt"
+Content-Type: application/octet-stream
+
+bar1-content
+--2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a
+Content-Disposition: form-data; name="bar"; filename="bar2.txt"
+Content-Type: text/bary
+
+bar2-content
+--2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a
+Content-Disposition: form-data; name="baz"; filename="baz"
+Content-Type: text/bazzy
+
+baz-content
+--2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a
+Content-Disposition: form-data; name="qux"; filename="qux%0A%22\\.txt"
+Content-Type: application/octet-stream
+
+qux-content
+--2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a--
+`;
+
+    const req = new Request('https://example.org', {
+      method: 'POST',
+      body: INPUT,
+      headers: {
+        'content-type': 'multipart/form-data;boundary=2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a'
+      }
+    });
+
+    const form = await req.formData();
+
+    form.set("foo", new File(["foo-content"], "foo.txt"));
+    form.append("bar", new File(["bar1-content"], "bar1.txt"), "bar-renamed.txt");
+    form.append("bar", new File(["bar2-content"], "bar2.txt", {type: "text/bary"}));
+    form.append("baz", new Blob(["baz-content"], {type: "text/bazzy"}));
+    form.set("qux", new Blob(["qux-content"]), "qux\n\"\\.txt");
+
+    {
+      let resp = new Response(form);
+      let text = await resp.text();
+      let roundtrip = await new Response(text, {headers: resp.headers}).formData();
+      if (roundtrip.get("foo") != "foo-content") {
+        throw new Error("expected round-trip turns into string (wrong, but backwards-compatible)");
+      }
+    }
+
+  }
+};
+

src/workerd/api/tests/form-data-legacy-test.wd-test

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+using Workerd = import "/workerd/workerd.capnp";
+
+const unitTestsLegacy :Workerd.Config = (
+  services = [
+    ( name = "form-data-legacy-test",
+      worker = (
+        modules = [
+          (name = "worker", esModule = embed "form-data-legacy-test.js")
+        ],
+        compatibilityDate = "2023-01-15",
+        compatibilityFlags = [
+          "nodejs_compat",
+          "formdata_parser_converts_files_to_strings"
+        ],
+      )
+    ),
+  ],
+);
+