Create specs for Google::Apis::Error

spec/google/apis/errors_spec.rb

@@ -0,0 +1,96 @@
+# Copyright 2016 Google Inc.
+#
+# 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
+#
+#      http://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 'spec_helper'
+
+RSpec.describe Google::Apis::Error do
+  describe 'constructor' do
+    subject { described_class.new(error) }
+
+    describe 'message' do
+      context 'first arg is a string which does not respond to :backtrace' do
+        let(:error) { 'an error occurred' }
+
+        it 'creates a instance of Error with message' do
+          expect(subject.message).to eq 'an error occurred'
+        end
+      end
+
+      context 'first arg responds to :backtrace' do
+        let(:error) { double }
+
+        it 'creates a instance of Error with message' do
+          allow(error).to receive(:respond_to?).with(:backtrace) { true }
+          allow(error).to receive(:message) { 'error message' }
+          expect(subject.message).to eq 'error message'
+        end
+      end
+    end
+
+    describe 'instance variables @body, @header, and @status_code' do
+      let(:error) { 'an error occurred' }
+
+      context 'params :body, :header, and :status_code are not given' do
+        it 'instance variables @body, @header, and @status_code will be nil' do
+          expect(subject.body).to be_nil
+          expect(subject.header).to be_nil
+          expect(subject.status_code).to be_nil
+        end
+      end
+
+      context 'params :body, :header, and :status_code are given' do
+        subject do
+          described_class.new(
+            error,
+            body:       'this is body',
+            header:     'this is header',
+            status_code: 200)
+        end
+
+        it 'instance variables @body, @header, and @status_code will not be nil' do
+          expect(subject.body).to eq 'this is body'
+          expect(subject.header).to eq 'this is header'
+          expect(subject.status_code).to eq 200
+        end
+      end
+    end
+  end
+
+  describe '#backtrace' do
+    subject { described_class.new('error') }
+    let(:cause) { instance_double('Error', backtrace: 'this is backtrace') }
+
+    context '@cause is truthy' do
+      it 'calls @cause.backtrace' do
+        subject.instance_variable_set(:@cause, cause)
+        expect(subject.backtrace).to eq 'this is backtrace'
+      end
+    end
+
+    context '@cause is falsy' do
+      before do
+        subject.class.superclass.class_eval do
+          def backtrace
+            "super class's #backtrace called"
+          end
+        end
+      end
+
+      it "calls super class's #backtrace" do
+        subject.instance_variable_set(:@cause, false)
+        expect(subject.backtrace).to eq "super class's #backtrace called"
+      end
+    end
+  end
+end