1 files changed, 24 insertions, 0 deletions
diff --git a/test/js/web/fetch/fetch.test.ts b/test/js/web/fetch/fetch.test.ts
index aa44ee76a..4ef5d7bba 100644
--- a/test/js/web/fetch/fetch.test.ts
+++ b/test/js/web/fetch/fetch.test.ts
@@ -93,6 +93,30 @@ describe("fetch data urls", () => {
     expect(blob.type).toBe("text/plain;charset=utf-8");
     expect(blob.text()).resolves.toBe("helloworld!");
   });
+  it("unstrict parsing of invalid URL characters", async () => {
+    var url = "data:application/json,{%7B%7D}";
+    var res = await fetch(url);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    var blob = await res.blob();
+    expect(blob.size).toBe(4);
+    expect(blob.type).toBe("application/json;charset=utf-8");
+    expect(blob.text()).resolves.toBe("{{}}");
+  });
+  it("unstrict parsing of double percent characters", async () => {
+    var url = "data:application/json,{%%7B%7D%%}%%";
+    var res = await fetch(url);
+    expect(res.status).toBe(200);
+    expect(res.statusText).toBe("OK");
+    expect(res.ok).toBe(true);
+
+    var blob = await res.blob();
+    expect(blob.size).toBe(9);
+    expect(blob.type).toBe("application/json;charset=utf-8");
+    expect(blob.text()).resolves.toBe("{%{}%%}%%");
+  });
   it("data url (invalid)", async () => {
     var url = "data:Hello%2C%20World!";
     expect(async () => {