Squashed commit of the following(Update Spec for new desgins):

commit 87f649da096edb6aa469faf8339b4a762a3402ca
Author: Yuma Soga <ysoga19@gmail.com>
Date:   Sat Jul 7 22:52:13 2018 +0900

    Update Spec for New desgin for Seinding Contact form

commit 1996eac35aa3fbfab36341768f28cb887a34710d
Author: Yuma Soga <ysoga19@gmail.com>
Date:   Sat Jul 7 17:35:02 2018 +0900

    Update spec for instance variable of contact_form

    s

commit 71d89ca5730810c5aaf793de41ae430aad45942e
Author: Yuma Soga <ysoga19@gmail.com>
Date:   Sat Jul 7 17:15:05 2018 +0900

    Add Spec dor new desgin

Author: Yuma Soga

app/models/contact_form.rb

@@ -21,7 +21,7 @@ def save
       @subject = self.subject
       @body = self.body
 
-      bodyAttachments = {"title":"メンターお問いあわせ",
+      bodyAttachments = {"title": "メンターお問いあわせ",
                           "text": "\n\n\n*Email* :\n" + @email +
                           "\n\n*お名前* :\n" + @name +
                           "\n\n*件名* :\n" + @subject +
@@ -30,10 +30,14 @@ def save
 
       massage_body = "<!channel> お問い合わせフォームより新しい通知が来ています！ \n"
 
-      hooks_url = ENV['SLACK_INCOMING_WEBHOOKS_URL']
-      notifier = Slack::Notifier.new hooks_url, channel: "#各種お問い合わせボード"
-      notifier.post attachments: [bodyAttachments], text: massage_body
+      slack_notifer_client.post attachments: [bodyAttachments], text: massage_body
       true
     end
   end
+  
+  private
+  def slack_notifer_client
+    hooks_url = ENV['SLACK_INCOMING_WEBHOOKS_URL']
+    Slack::Notifier.new hooks_url, channel: "#各種お問い合わせボード"
+  end
 end

spec/models/contact_form_spec.rb

@@ -1,5 +1,112 @@
 require 'rails_helper'
 
 RSpec.describe ContactForm, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  describe "#Save" do
+
+    describe "バリデーション" do
+
+      let(:contact_form) { ContactForm.new(params) }
+
+      let(:params) { { name: name, email: email, subject: subject, body: body } }
+
+      before :each do
+        contact_form.save
+      end
+
+      context "Name が空欄の時" do
+        let(:name) {  }
+        let(:email) { "ABE@TESTMAIL.COM" }
+        let(:subject) { "Subject" }
+        let(:body) { "ABCDEF BODY" }
+
+        it "エラーを返すこと" do
+          Rails.logger.info contact_form
+          expect(contact_form.errors[:name]).to be_present
+        end
+      end
+
+      context "E-mail が空欄の時" do
+        let(:name) { "ABC NAME" }
+        let(:email) {  }
+        let(:subject) { "Subject" }
+        let(:body) { "ABCDEF BODY" }
+
+        it "エラーを返すこと" do
+          expect(contact_form.errors[:email]).to be_present
+        end
+      end
+
+      context "Subject が空欄の時" do
+        let(:name) { "ABC NAME" }
+        let(:email) { "ABE@TESTMAIL.COM" }
+        let(:subject) {  }
+        let(:body) { "ABCDEF BODY" }
+
+        it "エラーを返すこと" do
+          expect(contact_form.errors[:subject]).to be_present
+        end
+      end
+
+      context "Body が空欄の時" do
+        let(:name) { "ABC NAME" }
+        let(:email) { "ABE@TESTMAIL.COM" }
+        let(:subject) { "Subject" }
+        let(:body) {  }
+
+        it "エラーを返すこと" do
+          Rails.logger.info contact_form
+          contact_form.save
+          expect(contact_form.errors[:body]).to be_present
+        end
+      end
+
+    end
+
+    describe "フォーム送信" do
+      let(:contact_form) { ContactForm.new(params) }
+
+      let(:params) { { name: name, email: email, subject: subject, body: body, agreement_privacy_policy: true} }
+
+      context "全ての項目が埋まっている時" do
+        let(:name) { "ABC NAME" }
+        let(:email) { "ABE@TESTMAIL.COM" }
+        let(:subject) { "Subject" }
+        let(:body) { "ABCDEF BODY" }
+
+        let(:slack_notifer_client_mock) { spy('Slack Notifer Client') }
+
+        let(:massage_body) { "<!channel> お問い合わせフォームより新しい通知が来ています！ \n" }
+
+        let(:bodyAttachments) {
+          {"title": "メンターお問いあわせ",
+            "text": "\n\n\n*Email* :\n" + email +
+            "\n\n*お名前* :\n" + name +
+            "\n\n*件名* :\n" + subject +
+            "\n\n*本文* :\n" + body
+          }
+        }
+
+        before do
+          slack_notifer_client_mock = spy('Slack Notifer Client')
+          allow_any_instance_of(ContactForm).to receive(:slack_notifer_client).and_return(slack_notifer_client_mock)
+        end
+
+        it "フォームがエラーなく送信されること" do
+          expect{ contact_form.save }.not_to raise_error
+        end
+
+        it "Slack に正しい情報が渡されること" do
+          expect(slack_notifer_client_mock).to receive(:post)
+          expect(contact_form.save).to be_truthy
+        end
+
+        it "それぞれのインスタンス変数に正しい値が代入されていること" do
+          expect(contact_form.instance_variable_get :@name).to eq name
+          expect(contact_form.instance_variable_get :@email).to eq email
+          expect(contact_form.instance_variable_get :@subject).to eq subject
+          expect(contact_form.instance_variable_get :@body).to eq body
+        end
+      end
+    end
+  end
 end

spec/rails_helper.rb

@@ -5,6 +5,9 @@
 # Prevent database truncation if the environment is production
 abort("The Rails environment is running in production mode!") if Rails.env.production?
 require 'rspec/rails'
+
+# Rails.logger = Logger.new(STDOUT)
+
 # Add additional requires below this line. Rails is not loaded until this point!
 
 # Requires supporting ruby files with custom matchers and macros, etc, in