Mockito when()... then()NullPointerException [英] Mockito when()...then() NullPointerException
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问题描述
productsInDatabse是一个hashMap,输出是枚举,scanCode来自经过测试的类
productsInDatabse is a hashMap, output is enum, scanCode is from class which is tested
public static boolean isInDataBase(int code) {
return productsInDatabse.containsKey(code);
}
我已经进行了测试:
@Test
public void testScanCodeForCodeNotFound() {
Database db = Mockito.mock(Database.class);
when(db.isInDataBase(444)).thenReturn(false);
output = scanner.scanCode("444");
assertTrue(output == ProductProcessing.PRODUCT_NOT_FOUND);
}
但是when()... then()随NPE返回.我在调用时看到的例子完全是这样的.所以我的问题是错误在哪里,因为我认为when()... then()就像那样工作.
But when()...then() returns with NPE. I saw examples when invoking was exactly like this. So my question is where is the bug, because I thought when()...then() works likes that.
Stacktrace:
Stacktrace:
Testcase: testScanCodeForCodeNotFound(iodevices.BarCodesScannerTest): Caused an ERROR
null
java.lang.NullPointerException
at database.Database.isInDataBase(Database.java:66)
at iodevices.BarCodesScannerTest.testScanCodeForCodeNotFound(BarCodesScannerTest.java:50)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
Test iodevices.BarCodesScannerTest FAILED
推荐答案
从isInDataBase()
声明中删除static
.
如果无法删除静态,请参见以下内容:用Mockito模拟静态方法
See this if you can't remove the static: Mocking static methods with Mockito
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