This is what I intend to do在为边界值分析设计Junit测试用例时，我遇到了问题。第一个类是基于层次结构执行逻辑排序的类。使用assertEquals时程序行为不正常。它不断重复先前的assertEquals所做的事情。因此，最终，任何进一步的评估都将被视为无用。
public class AssignCharges {
RandomGeneratorClass rgc = new RandomGeneratorClass();
// To test for cases less than 0
public double getCharges(int distance, int weight) {
// declaring the variable to be fit into the given situation
double charges = 0;
if(weight < 0 || distance < 0)
throw new IllegalArgumentException("Values cannot be negative.");
// Testing for valid first boundary values
// @ <300g, <10km, RM 5
else if(weight > 0 && weight < 300){
charges = 5;
}
// Testing for valid second boundary values @ 300-1000g
else if(weight >= 300 && weight < 1000){
// @ distance < 10km, RM 8
if(distance > 0 && distance < 10)
charges = 8;
// @ 10 < distance < 30, RM 10
else if(distance >= 10 && distance < 30)
charges = 10;
// @ distance >= 30, RM 20
else
charges = 20;
}
// Testing for valid third boundary values @ 1001-3000 g
else if(weight >= 1000 && weight <3000){
// @ < 10km, RM 8
if(distance > 0 && distance < 10)
charges = 8;
// @ 10 < distance < 30, RM 12
else if(distance >= 10 && distance < 30)
charges = 12;
// @ distance > 30, RM 30
else
charges = 30;
}
// Testing for valid fourth boundary values @ 3001-5000g
else if(weight >= 3000 && weight < 5000){
// @ < 10km, RM 10
if(distance > 0 && distance < 10)
charges = 10;
// @ 10 < distance < 30, RM 15
else if(distance >= 10 && distance < 30)
charges = 15;
// @ distance > 30, RM 40
else
charges = 40;
}
// Testing for valid fifth boundary values @ >5000g
else if(weight >= 5000){
// @ < 10km, RM 15
if(distance > 0 && distance < 10)
charges = 15;
// @ 10 < distance < 30, RM 20
else if(distance >= 10 && distance < 30)
charges = 20;
// @ distance > 30, RM 50
else
charges = 50;
}
// Testing for invalid negative boundary values
// The else is sufficient as the only invalid values = negative values
else if(weight == 0 && distance == 0)
charges = 0;
// replies the amount of corresponding charges
return charges;
}
这将是Junit代码：
public class AssignChargesTest {
@Test
public void testAssignWeightDistanceInvalidBoundary(){
AssignCharges ac = new AssignCharges();
double charges;
// invalid boundary
charges = ac.getCharges(0, 0);
assertEquals(0, charges, 0);
}
@Test
public void testAssignWeightDistanceFirstBoundary(){
AssignCharges ac = new AssignCharges();
double charges;
// first boundary
charges = ac.getCharges(299, 5);
assertEquals(5, charges, 0);
}
@Test
public void testAssignWeightDistanceSecondBoundary(){
AssignCharges ac = new AssignCharges();
double charges;
// second boundary
charges = ac.getCharges(999, 5);
assertEquals(8, charges, 0);
charges = ac.getCharges(999, 20);
assertEquals(10, charges, 0);
charges = ac.getCharges(999, 40);
assertEquals(20, charges, 0);
}
@Test
public void testAssignWeightDistanceThirdBoundary(){
AssignCharges ac = new AssignCharges();
double charges;
// third boundary
charges = ac.getCharges(2999, 5);
assertEquals(8, charges, 0);
charges = ac.getCharges(2999, 20);
assertEquals(12, charges, 0);
charges = ac.getCharges(2999, 40);
assertEquals(30, charges, 0);
}
@Test
public void testAssignWeightDistanceFourthBoundary(){
AssignCharges ac = new AssignCharges();
double charges;
// fourth boundary
charges = ac.getCharges(4999, 5);
assertEquals(10, charges, 0);
charges = ac.getCharges(4999, 20);
assertEquals(15, charges, 0);
charges = ac.getCharges(4999, 40);
assertEquals(40, charges, 0);
}
@Test
public void testAssignWeightDistanceFifthBoundary(){
AssignCharges ac = new AssignCharges();
double charges;
// fifth boundary
charges = ac.getCharges(5001, 5);
assertEquals(15, charges, 0);
charges = ac.getCharges(5001, 20);
assertEquals(20, charges, 0);
charges = ac.getCharges(5001, 40);
assertEquals(50, charges, 0);
}
@Test(expected = IllegalArgumentException.class)
public void testIllegalArgumentException(){
AssignCharges ac = new AssignCharges();
double charges;
// invalid arguments list in terms of negative values:
// below boundary @ negative weight, negative distance
charges = ac.getCharges(-5, -5);
// positive weight, negative distance
charges = ac.getCharges(299, -5);
charges = ac.getCharges(999, -5);
charges = ac.getCharges(2999, -5);
charges = ac.getCharges(4999, -5);
charges = ac.getCharges(5001, -5);
// negative weight, positive distance
charges = ac.getCharges(-1, 2);
charges = ac.getCharges(-2, 12);
charges = ac.getCharges(-3, 22);
charges = ac.getCharges(-4, 32);
}
}
答案 0 :(得分：0)
JUnit只不过是Java。一旦一个Java语句突然完成（例如抛出异常），后续的语句就不会被执行。
如果你有一系列这样的陈述：
charges = ac.getCharges(-5, -5);
charges = ac.getCharges(-5, -5);
charges = ac.getCharges(-5, -5);
// ...
（我知道他们和我刚刚复制+粘贴的一样）
一旦第一个失败，其他的就是多余的。
你需要做一些事情，比如在try / catch块中包装调用，以便允许执行超出失败：
try {
ac.getCharges(-5, -5);
fail();
} catch (IllegalArgumentException expected) {
}
try {
ac.getCharges(-5, -5);
fail();
} catch (IllegalArgumentException expected) {
}
// ...
所以执行将继续。
这显然非常冗长。相反，考虑编写一个这样的方法：
void assertGetChargesFails(int a, int b) {
try {
ac.getCharges(a, b);
fail();
} catch (IllegalArgumentException expected) {
}
}
然后调用：
assertGetChargesFails(-5, -5);
assertGetChargesFails(-5, -5);
assertGetChargesFails(-5, -5);
如果您正在使用JUnit 4.15或更高版本以及Java 8，那么assertThrows method可以更好地完成此任务：
assertThrows(IllegalArgumentException.class, () -> ac.getChanges(-5, -5));
assertThrows(IllegalArgumentException.class, () -> ac.getChanges(-5, -5));
如果未抛出异常，则每个assertThrows行都将失败。