Junit 单元测试

1. 测试public方法

待测代码：

package myPro;public class ACase {public String echoRequest(String[] request) {StringBuffer sb = new StringBuffer();for(String str: request) sb.append(" " + str);        return "Hello!" + sb.toString();      }            public String echoRequest() {          return "Hello!";      }}

测试代码：

package myPro;import static org.junit.Assert.*;import org.junit.Before;import org.junit.Test;public class ACaseTest {ACase a = null;@Beforepublic void setUp() throws Exception {a = new ACase();}@Testpublic void testEchoRequestStringArray() {String[] request = "this is a test information".split(" ");String s = a.echoRequest(request);System.out.println(s);     assertNotNull(s);}@Testpublic void testEchoRequest() {String s = a.echoRequest();System.out.println(s); assertNotNull(s);}}

2. 测试staic内部类的private方法

待测代码：

package myPro;public class BCase {static class InnerBCase {private String echoRequest(String[] request) {StringBuffer sb = new StringBuffer();for(String str: request) sb.append(" " + str);return "Hello!" + sb.toString();  }        private String echoRequest() {  return "Hello!";  }}}

测试代码：

package myPro;import static org.junit.Assert.*;import java.lang.reflect.Method;import org.junit.Before;import org.junit.Test;public class BCaseTest {BCase.InnerBCase a = null;@Beforepublic void setUp() throws Exception {a = new BCase.InnerBCase();}/** * @function: test method with parameters */@Test  public void testParamEchoRequest() throws Exception {Method testNoParamMethod = a.getClass().getDeclaredMethod("echoRequest",String[].class);   testNoParamMethod.setAccessible(true);String[] strs = "this is a test information".split(" ");    Object result = testNoParamMethod.invoke(a, (Object)strs); //注意此处String[]类型的参数，必须加上(Object)，否则会认为为可变参数，报错    System.out.println(result);    assertNotNull(result);  }/** * @function: test methods with no parameters */@Test  public void testNoParamEchoRequest() throws Exception {Method testNoParamMethod = a.getClass().getDeclaredMethod("echoRequest", null);    testNoParamMethod.setAccessible(true);       Object result = testNoParamMethod.invoke(a, null);      System.out.println(result);     assertNotNull(result);}  }

3. 测试void方法

待测代码：

package myPro;public class CCase {String nickname = null;String[] logFormat = null;private void generateLogFormat(String str) {if (str == null)return;str = str.trim();int k = str.length() - 1;while (k>=0 && str.charAt(k) != '"')k--;if(k <= 1) return;nickname = str.substring(k + 1).trim();str = str.substring(1, k);logFormat = str.split(" ");}}

测试代码：

package myPro;import static org.junit.Assert.*;import java.lang.reflect.Method;import org.junit.Before;import org.junit.Test;public class CCaseTest {CCase c = null;@Beforepublic void setUp() throws Exception {c = new CCase();}@Testpublic void testGenerateLogFormat() throws Exception {String str = "\"%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\"\" combined";Method testNoParamMethod = c.getClass().getDeclaredMethod("generateLogFormat",String.class);   testNoParamMethod.setAccessible(true);testNoParamMethod.invoke(c, (Object)str);assertNotNull(c.nickname);System.out.println(c.nickname);assertNotNull(c.logFormat);for(String s: c.logFormat) System.out.print(s + " ");System.out.println();}}

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