英文:
How would you create a test for a Constructor?
问题
我正在为一个已编译程序创建测试，但在获取100%覆盖率方面遇到了问题。
该类的构造函数如下：
public Contact(String name, String email){
if (name == null){
throw new IllegalAgrugmentException("name must not be null");
}
}
我创建的测试如下：
public void testForContactConstructor(){
Contact testContact = new Contact(null, null);
assertThrows(IllegalArgumentException.class, () -> {
testContact.getName();
});
}
这个测试在Eclipse中没有被覆盖。我该如何解决这个问题？
英文:
I'm creating tests for an already complied program, and I'm having trouble getting 100% coverage.
The constructor for a class is:
public Contact(String name, String email){
if (name == null){
throw new IllegalAgrugmentException("name must not be null");
}
}
The test I created reads:
public void testForContactConstructor(){
Contact testContact = new Contact(null, null);
assertThrows(IllegalArgumentException.class, () -> {
testContact.getName();
});
}
The test doesn't get covered in eclispe. How would I fix this?
答案1
得分: 2
你的断言似乎应该是这样的：
assertThrows(IllegalArgumentException.class, () -> {
contact = new Contact(null, null);
});
否则它会在达到你的断言之前抛出异常 
除此之外，我需要更多的信息，你使用的是什么测试框架？可能会缺少一些注解。
总的来说，你可以像这样做（取决于构造函数有多复杂）：
public void TestContactConstructorFail(){
assertThrows(IllegalArgumentException.class, () ->
new Contact(null, null));
}
public void TestContactConstructorSuccess(){
Contact c = new Contact(name, email);
assertNotNull(c); //将其余部分留给 get/set 测试
}
（还可以添加任何特定于框架的注解，例如 Junit 的 @Test）
如果构造函数中有复杂的验证或其他内容，我建议将这些内容委托给私有（或类似私有）的方法，并单独对这些方法进行测试。
英文:
Your assertion seems like it should be
assertThrows(IllegalArgumentException.class, () -> {
contact = new Contact(null, null);
});
Otherwise it will throw before getting to your assert
Other than that i need a little more information, what test framework are you using? There could be annotations missing
All in all you could do something like this (depending on how complex a constructor) :
public void TestContactConstructorFail(){
assertThrows(IllegalArgumentException.class, () ->
new Contact(null, null));
}
public void TestContactConstructorSuccess(){
Contact c = new Contact(name,email);
assertNotNull(c); //leave the rest for get/set test
}
(add any framework specific annotations as well, e.g. @Test for Junit)
IF you have complex validation or other things in your constructor, i would recommend delegating these to private(ish) methods and testing these separately.
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