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1 public class Calculator {
2 public int evaluate(String expression) {
3 int sum = 0;
4 for (String summand: expression.split("\\+"))
5 sum += Integer.valueOf(summand);
6 return sum;
7 }
8 }
然后在cmd中执行命令：javac Calculator.java
4.新建CalculatorTest.java. 放入junit-example文件夹中，内容如下：
1 import static org.junit.Assert.assertEquals;
2 import org.junit.Test;
3 public class CalculatorTest {
4 @Test
5 public void evaluatesExpression() {
6 Calculator calculator = new Calculator();
7 int sum = calculator.evaluate("1+2+3");
8 assertEquals(6, sum);
9 }
10 }
然后在cmd中执行命令：javac -cp .;junit-4.12.jar CalculatorTest.java
JUnit version 4.12
.
Time: 0.004
OK (1 test)
JUnit version 4.12
.E
Time: 0.007
There was 1 failure:
1) evaluatesExpression(CalculatorTest)
java.lang.AssertionError: expected: but was:
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:834)
at org.junit.Assert.assertEquals(Assert.java:645)
at org.junit.Assert.assertEquals(Assert.java:631)
at CalculatorTest.evaluatesExpression(CalculatorTest.java:9)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at org.junit.runner.JUnitCore.runMain(JUnitCore.java:77)
at org.junit.runner.JUnitCore.main(JUnitCore.java:36)
FAILURES!!!
Tests run: 1, Failures: 1
7.cmd中命令执行全过程如下图：
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原文地址：http://www.cnblogs.com/ady-chow/p/4437972.html
