adds debate model specs [#5]

spec/models/debate_spec.rb

@@ -1,5 +1,28 @@
 require 'rails_helper'
 
-RSpec.describe Debate, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+describe Debate do
+
+  before(:each) do
+    @debate = build(:debate)
+  end
+
+  it "should be valid" do
+    expect(@debate).to be_valid
+  end
+
+  it "should not be valid without a title" do
+    @debate.title = nil
+    expect(@debate).to_not be_valid
+  end
+
+  it "should not be valid without a description" do
+    @debate.description = nil
+    expect(@debate).to_not be_valid
+  end
+
+  it "should not be valid without accepting terms of service" do
+    @debate.terms_of_service = nil
+    expect(@debate).to_not be_valid
+  end
+  
 end