Added newsletter specs

spec/models/newsletter_spec.rb

@@ -0,0 +1,34 @@
+require 'rails_helper'
+
+describe Newsletter do
+  let(:newsletter) { build(:newsletter) }
+
+  it "is valid" do
+    expect(newsletter).to be_valid
+  end
+
+  it 'is not valid without a subject' do
+    newsletter.subject = nil
+    expect(newsletter).not_to be_valid
+  end
+
+  it 'is not valid without a segment_recipient' do
+    newsletter.segment_recipient = nil
+    expect(newsletter).not_to be_valid
+  end
+
+  it 'is not valid without a from' do
+    newsletter.from = nil
+    expect(newsletter).not_to be_valid
+  end
+
+  it 'is not valid without a body' do
+    newsletter.body = nil
+    expect(newsletter).not_to be_valid
+  end
+
+  it 'validates from attribute email format' do
+    newsletter.from = "this_is_not_an_email"
+    expect(newsletter).not_to be_valid
+  end
+end