[tests] added global.TestHelpers + firestore helpers `TestHelpers.firestore.X`

bridge/helpers/firestore.js

@@ -0,0 +1,42 @@
+module.exports = {
+  DOC_1: { name: 'doc1' },
+
+  DOC_2: { name: 'doc2', title: 'Document 2' },
+
+  // needs to be a fn as firebase may not yet be available
+  COL_DOC_1() {
+    return {
+      baz: true,
+      daz: 123,
+      foo: 'bar',
+      gaz: 12.1234567,
+      geopoint: new firebase.firestore.GeoPoint(0, 0),
+      naz: null,
+      object: {
+        daz: 123,
+      },
+      timestamp: new Date(2017, 2, 10, 10, 0, 0),
+    };
+  },
+
+  /**
+   *
+   * @param collectionName
+   * @return {Promise<*>}
+   */
+  async cleanCollection(collectionName = 'collection-tests') {
+    const firestore = firebaseAdmin.firestore();
+    const batch = firestore.batch();
+    const collection = firestore.collection(collectionName);
+    const docsToDelete = await collection.get();
+
+    for (let i = 0, len = docsToDelete.length; i < len; i++) {
+      const { ref, path } = docsToDelete[i];
+      if (path.includes(testRunId)) {
+        batch.delete(ref);
+      }
+    }
+
+    return writeBatch.commit();
+  },
+};