1 files changed, 99 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/form-submission-0/form-data-set-empty-file.window.js b/testing/web-platform/tests/html/semantics/forms/form-submission-0/form-data-set-empty-file.window.js
new file mode 100644
index 0000000000..7df128515c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/form-submission-0/form-data-set-empty-file.window.js
@@ -0,0 +1,99 @@
+test(t => {
+  const form = document.body.appendChild(document.createElement("form")),
+        input = form.appendChild(document.createElement("input"));
+  input.type = "file";
+  input.name = "hi";
+  t.add_cleanup(() => {
+    document.body.removeChild(form);
+  });
+  const fd = new FormData(form),
+        value = fd.get(input.name);
+  assert_true(value instanceof File, "value is a File");
+  assert_equals(value.name, "", "name");
+  assert_equals(value.type, "application/octet-stream", "type");
+  assert_equals(value.size, 0, "expected value to be an empty File");
+}, "Empty <input type=file> is still added to the form's entry list");
+
+async_test((t) => {
+  const form = document.body.appendChild(document.createElement("form")),
+        input = form.appendChild(document.createElement("input")),
+        target = document.createElement("iframe");
+  target.name = "target1";
+  document.body.appendChild(target);
+  form.method = "POST";
+  form.action = "/fetch/api/resources/echo-content.py";
+  form.enctype = "application/x-www-form-urlencoded";
+  form.target = target.name;
+  input.type = "file";
+  input.name = "hi";
+  t.add_cleanup(() => {
+    document.body.removeChild(form);
+    document.body.removeChild(target);
+  });
+
+  target.addEventListener("load", t.step_func_done(() => {
+    assert_equals(target.contentDocument.body.textContent, "hi=");
+  }));
+  form.submit();
+}, "Empty <input type=file> shows up in the urlencoded serialization");
+
+async_test((t) => {
+  const form = document.body.appendChild(document.createElement("form")),
+        input = form.appendChild(document.createElement("input")),
+        target = document.createElement("iframe");
+  target.name = "target2";
+  document.body.appendChild(target);
+  form.method = "POST";
+  form.action = "/fetch/api/resources/echo-content.py";
+  form.enctype = "multipart/form-data";
+  form.target = target.name;
+  input.type = "file";
+  input.name = "hi";
+  t.add_cleanup(() => {
+    document.body.removeChild(form);
+    document.body.removeChild(target);
+  });
+
+  target.addEventListener("load", t.step_func_done(() => {
+    // We use \n rather than \r\n because newlines get normalized as a result
+    // of HTML parsing.
+    const found = target.contentDocument.body.textContent;
+    const boundary = found.split("\n")[0];
+    const expected = [
+      boundary,
+      'Content-Disposition: form-data; name="hi"; filename=""',
+      "Content-Type: application/octet-stream",
+      "",
+      "",
+      boundary + "--",
+      "",
+    ].join("\n");
+    assert_equals(found, expected);
+  }));
+  form.submit();
+}, "Empty <input type=file> shows up in the multipart/form-data serialization");
+
+async_test((t) => {
+  const form = document.body.appendChild(document.createElement("form")),
+        input = form.appendChild(document.createElement("input")),
+        target = document.createElement("iframe");
+  target.name = "target3";
+  document.body.appendChild(target);
+  form.method = "POST";
+  form.action = "/fetch/api/resources/echo-content.py";
+  form.enctype = "text/plain";
+  form.target = target.name;
+  input.type = "file";
+  input.name = "hi";
+  t.add_cleanup(() => {
+    document.body.removeChild(form);
+    document.body.removeChild(target);
+  });
+
+  target.addEventListener("load", t.step_func_done(() => {
+    // The actual result is "hi=\r\n"; the newline gets normalized as a side
+    // effect of the HTML parsing.
+    assert_equals(target.contentDocument.body.textContent, "hi=\n");
+  }));
+  form.submit();
+}, "Empty <input type=file> shows up in the text/plain serialization");