Rename all test files from JS -> ES6

test/javascripts/admin/models/theme-test.js

@@ -0,0 +1,21 @@
+import Theme from "admin/models/theme";
+
+QUnit.module("model:theme");
+
+QUnit.test("can add an upload correctly", function(assert) {
+  let theme = Theme.create();
+
+  assert.equal(
+    theme.get("uploads.length"),
+    0,
+    "uploads should be an empty array"
+  );
+
+  theme.setField("common", "bob", "", 999, 2);
+  let fields = theme.get("theme_fields");
+  assert.equal(fields.length, 1, "expecting 1 theme field");
+  assert.equal(fields[0].upload_id, 999, "expecting upload id to be set");
+  assert.equal(fields[0].type_id, 2, "expecting type id to be set");
+
+  assert.equal(theme.get("uploads.length"), 1, "expecting an upload");
+});