Add unit tests

google-cloud-firestore/lib/google/cloud/firestore/query.rb

@@ -63,7 +63,7 @@ class Query
         attr_accessor :parent_path
 
         ##
-        # @private The Google::Firestore::V1::Query object.
+        # @private The Google::Firestore::V1::StructuredQuery object.
         attr_accessor :query
 
         ##

google-cloud-firestore/test/google/cloud/firestore/client/col_group_test.rb

@@ -0,0 +1,51 @@
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require "helper"
+
+describe Google::Cloud::Firestore::Client, :col_group, :mock_firestore do
+  let(:collection_id) { "my-collection-id" }
+  let(:collection_id_bad) { "a/b/my-collection-id" }
+
+  it "creates a collection group query" do
+    query = firestore.col_group(collection_id).where "foo", "==", "bar"
+
+    query.must_be_kind_of Google::Cloud::Firestore::Query
+    query_gapi = query.query
+    query_gapi.must_be_kind_of Google::Firestore::V1::StructuredQuery
+    query_gapi.from.size.must_equal 1
+    query_gapi.from.first.must_be_kind_of Google::Firestore::V1::StructuredQuery::CollectionSelector
+    query_gapi.from.first.all_descendants.must_equal true
+    query_gapi.from.first.collection_id.must_equal collection_id
+  end
+
+  it "creates a collection group query using collection_group alias" do
+    query = firestore.collection_group(collection_id).where "foo", "==", "bar"
+
+    query.must_be_kind_of Google::Cloud::Firestore::Query
+    query_gapi = query.query
+    query_gapi.must_be_kind_of Google::Firestore::V1::StructuredQuery
+    query_gapi.from.size.must_equal 1
+    query_gapi.from.first.must_be_kind_of Google::Firestore::V1::StructuredQuery::CollectionSelector
+    query_gapi.from.first.all_descendants.must_equal true
+    query_gapi.from.first.collection_id.must_equal collection_id
+  end
+
+  it "raises when collection_id contains a forward slash" do
+    error = expect do
+      firestore.col_group collection_id_bad
+    end.must_raise ArgumentError
+    error.message.must_equal "Invalid collection_id: 'a/b/my-collection-id', must not contain '/'."
+  end
+end