Retry: Rename all test files from JS -> ES6

test/javascripts/models/group-test.js

@@ -0,0 +1,21 @@
+import Group from "discourse/models/group";
+
+QUnit.module("model:group");
+
+QUnit.test("displayName", assert => {
+  const group = Group.create({ name: "test", display_name: "donkey" });
+
+  assert.equal(
+    group.get("displayName"),
+    "donkey",
+    "it should return the display name"
+  );
+
+  group.set("display_name", null);
+
+  assert.equal(
+    group.get("displayName"),
+    "test",
+    "it should return the group's name"
+  );
+});