Revert "Rename all test files from JS -> ES6"

This reverts commit 2abe85b834.

test/javascripts/components/share-button-test.js.es6

@@ -0,0 +1,16 @@
+import componentTest from "helpers/component-test";
+
+moduleForComponent("share-button", { integration: true });
+
+componentTest("share button", {
+  template: '{{share-button url="https://eviltrout.com"}}',
+
+  test(assert) {
+    assert.ok(find(`button.share`).length, "it has all the classes");
+
+    assert.ok(
+      find('button[data-share-url="https://eviltrout.com"]').length,
+      "it has the data attribute for sharing"
+    );
+  }
+});