junit 和cobertura 在测试驱动开发中的应用

在测试驱动开发中，单元测试非常重要，而测试代码的分支覆盖率和行覆盖率同样重要，目前比较流行的单元测试工具为junit，而覆盖率测试工具cobertura非常好用，现在将2者集成到一块，个人感觉在现实的开发中还是比较实际的，下面看一下集成的过程。

1、工程目录如下：

 

 2、编写类

public class OperateType {

	public static final String ADD = "add";
	public static final String SUB = "subtract";
	public static final String MULT = "multiply";
	public static final String DIV = "divide";

	public String getType(int typeNumber) {
		if (typeNumber == 1) {
			return ADD;
		} else if (typeNumber == 2) {
			return SUB;
		} else if (typeNumber == 3) {
			return MULT;
		} else if (typeNumber == 4) {
			return DIV;
		} else {
			return null;
		}
	}
}

 编写测试类

public class OperateTypeTest {
	
	private OperateType operateType ;

	@Before
	public void setUp() throws Exception {
		operateType = new OperateType();
	}

	@After
	public void tearDown() throws Exception {
		operateType = null;
	}

	@Test
	public void testGetType() {
		//要达到测试的覆盖率，需要进行充分的验证，所以需要验证5个
		Assert.assertEquals(OperateType.ADD,operateType.getType(1));
		Assert.assertEquals(OperateType.SUB,operateType.getType(2));
		Assert.assertEquals(OperateType.MULT,operateType.getType(3));
		Assert.assertEquals(OperateType.DIV,operateType.getType(4));
		Assert.assertEquals(null,operateType.getType(5));
	}

}

 3、配置cobertura信息

build.properties

 

# The source code for the examples can be found in this directory
src.dir=../src/main/java
test.dir=../src/test/java
# The path to cobertura.jar
cobertura.dir=../cobertura

# Classes generated by the javac compiler are deposited in this directory
classes.dir=classes

# Instrumented classes are deposited into this directory
instrumented.dir=instrumented

# All reports go into this directory
reports.dir=reports

# Unit test reports from JUnit are deposited into this directory
reports.xml.dir=${reports.dir}/junit-xml
reports.html.dir=${reports.dir}/junit-html

# Coverage reports are deposited into these directories
coverage.xml.dir=${reports.dir}/cobertura-xml
coverage.html.dir=${reports.dir}/cobertura-html

 bulid.xml

<?xml version="1.0" encoding="UTF-8"?>

<project name="cobertura.examples.basic" default="coverage" basedir=".">

	<description>
	    Cobertura - http://cobertura.sourceforge.net/
	    Copyright (C) 2003 jcoverage ltd.
	    Copyright (C) 2005 Mark Doliner &lt;[e-mail]&gt;
	    Cobertura is licensed under the GNU General Public License
	    Cobertura comes with ABSOLUTELY NO WARRANTY
    </description>

	<property file="build.properties" />
	<property name="project.lib.dir" location="../lib" />
	<!--
	<property name="cobertura.dir" location="../cobertura" />
	-->
	
	<!-- cobertura lib path -->
	<path id="cobertura.classpath">
		<fileset dir="${cobertura.dir}">
			<include name="lib/*.jar" />
		</fileset>
	</path>
	
	<!-- project lib path -->
	<path id="project.classpath">
		<fileset dir="${project.lib.dir}">
			<include name="*.jar" />
		</fileset>
	</path>

	<taskdef classpathref="cobertura.classpath" resource="tasks.properties"/>

	<!--Clean task-->
	<target name="clean" description="Remove all files created by the build/test process.">
		<delete dir="${classes.dir}" />
		<delete dir="${instrumented.dir}" />
		<delete dir="${reports.dir}" />
		<delete file="cobertura.log" />
		<delete file="cobertura.ser" />
	</target>

	<!--int task-->
	<target name="init">
		<mkdir dir="${classes.dir}" />
		<mkdir dir="${instrumented.dir}" />
		<mkdir dir="${reports.xml.dir}" />
		<mkdir dir="${reports.html.dir}" />
		<mkdir dir="${coverage.xml.dir}" />
		<mkdir dir="${coverage.html.dir}" />
	</target>

	<!--compile task-->
	<target name="compile" depends="init">
		<javac encoding="UTF-8" srcdir="${src.dir}" destdir="${classes.dir}" debug="true">
			<classpath>
				<path refid="project.classpath"/>
				<path refid="cobertura.classpath"/>
			</classpath>
		</javac>
		<javac srcdir="${test.dir}" destdir="${classes.dir}" debug="true">
			<classpath>
				<path refid="project.classpath"/>
				<path refid="cobertura.classpath"/>
			</classpath>
		</javac>
	</target>

	<target name="instrument" depends="init,compile">
		<!--
			Remove the coverage data file and any old instrumentation.
		-->
		<delete file="cobertura.ser"/>
		<delete dir="${instrumented.dir}" />

		<!--
			Instrument the application classes, writing the
			instrumented classes into ${build.instrumented.dir}.
		-->
		<cobertura-instrument todir="${instrumented.dir}">
			<!--
				The following line causes instrument to ignore any
				source line containing a reference to log4j, for the
				purposes of coverage reporting.
			-->
			<ignore regex="org.apache.log4j.*" />

			<fileset dir="${classes.dir}">
				<!--
					Instrument all the application classes, but
					don't instrument the test classes.
					*******************************************
				-->
				<include name="com/example/OperateType.class" />
			</fileset>
		</cobertura-instrument>
	</target>

	<target name="test" depends="init,compile">
		<junit fork="yes" dir="${basedir}" failureProperty="test.failed">
			<!--
				Note the classpath order: instrumented classes are before the
				original (uninstrumented) classes.  This is important.
			-->
			<classpath location="${instrumented.dir}" />
			<classpath location="${classes.dir}" />

			<!--
				The instrumented classes reference classes used by the
				Cobertura runtime, so Cobertura and its dependencies
				must be on your classpath.
			-->
			<classpath refid="project.classpath" />
			<classpath refid="cobertura.classpath" />

			<formatter type="xml" />
			<test name="${testcase}" todir="${reports.xml.dir}" if="testcase" />
			<batchtest todir="${reports.xml.dir}" unless="testcase">
				<fileset dir="${test.dir}">
					<!--
						Instrument all the test classes, but
						don't instrument the application classes.
						*******************************************
					-->
					<include name="com/example/OperateTypeTest.java" />
				</fileset>
			</batchtest>
		</junit>

		<junitreport todir="${reports.xml.dir}">
			<fileset dir="${reports.xml.dir}">
				<include name="TEST-*.xml" />
			</fileset>
			<report format="frames" todir="${reports.html.dir}" />
		</junitreport>
	</target>

	<target name="coverage-check">
		<cobertura-check branchrate="34" totallinerate="100" />
	</target>

	<target name="coverage-report">
		<!--
			Generate an XML file containing the coverage data using
			the "srcdir" attribute.
		-->
		<cobertura-report srcdir="${src.dir}" destdir="${coverage.xml.dir}" format="xml" />
	</target>

	<target name="alternate-coverage-report">
		<!--
			Generate a series of HTML files containing the coverage
			data in a user-readable form using nested source filesets.
		-->
		<cobertura-report destdir="${coverage.html.dir}">
			<fileset dir="${src.dir}">
				<include name="**/*.java"/>
			</fileset>
		</cobertura-report>
	</target>
	
	<target name="coverage" depends="clean,init,compile,instrument,test,coverage-report,alternate-coverage-report" description="Compile, instrument ourself, run the tests and generate JUnit and coverage reports."/>
</project>

 

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