[InfoPlistFile] Ensure the version string is exactly three dot-separated numbers

lib/cocoapods/generator/info_plist_file.rb

@@ -39,7 +39,8 @@ module Pod
       #
       def target_version
         if target && target.respond_to?(:root_spec)
-          target.root_spec.version.to_s
+          version = target.root_spec.version
+          [version.major, version.minor, version.patch].join('.')
         else
           '1.0.0'
         end

spec/unit/generator/info_plist_file_spec.rb

@@ -7,6 +7,43 @@ describe Pod::Generator::InfoPlistFile do
       generator.target_version.should == '1.0.0'
     end
 
+    describe 'sanitization' do
+      before do
+        @root_spec = mock('RootSpec')
+        pod_target = stub('PodTarget', :root_spec => @root_spec)
+        @generator = Pod::Generator::InfoPlistFile.new(pod_target)
+      end
+
+      it 'handles when the version is HEAD' do
+        version = Pod::Version.new('0.2.0')
+        version.head = true
+        @root_spec.stubs(:version).returns(version)
+        @generator.target_version.should == '0.2.0'
+      end
+
+      it 'handles when the version is more than 3 numeric parts' do
+        version = Pod::Version.new('0.2.0.1')
+        @root_spec.stubs(:version).returns(version)
+        @generator.target_version.should == '0.2.0'
+      end
+
+      it 'handles when the version is less than 3 numeric parts' do
+        version = Pod::Version.new('0.2')
+        @root_spec.stubs(:version).returns(version)
+        @generator.target_version.should == '0.2.0'
+      end
+
+      it 'handles when the version is a pre-release' do
+        version = Pod::Version.new('1.0.0-beta.1')
+        @root_spec.stubs(:version).returns(version)
+        @generator.target_version.should == '1.0.0'
+
+        version = Pod::Version.new('1.0-beta.5')
+        @root_spec.stubs(:version).returns(version)
+        @generator.target_version.should == '1.0.0'
+      end
+    end
+
     it 'returns the specification\'s version for the pod target' do
       generator = Pod::Generator::InfoPlistFile.new(fixture_pod_target('orange-framework/OrangeFramework.podspec'))
       generator.target_version.should == '0.1.0'