Add failing spec for Shell::Basic#no? when called with misc. data.

Author: sirbrillig

spec/shell/basic_spec.rb

@@ -73,6 +73,12 @@ def shell
         expect($stdin).to receive(:gets).and_return('n')
       expect(shell.yes?("Should I overwrite it?")).not_to be_true
     end
+
+    it "asks the user and returns false if the user replies with an answer other than yes or no" do
+      expect($stdout).to receive(:print).with("Should I overwrite it? ")
+        expect($stdin).to receive(:gets).and_return('foobar')
+      expect(shell.yes?("Should I overwrite it?")).to be_false
+    end
   end
 
   describe "#no?" do
@@ -85,6 +91,12 @@ def shell
         expect($stdin).to receive(:gets).and_return('Yes')
       expect(shell.no?("Should I overwrite it?")).to be_false
     end
+
+    it "asks the user and returns false if the user replies with an answer other than yes or no" do
+      expect($stdout).to receive(:print).with("Should I overwrite it? ")
+        expect($stdin).to receive(:gets).and_return('foobar')
+      expect(shell.no?("Should I overwrite it?")).to be_false
+    end
   end
 
   describe "#say" do