進行集成測驗時如何正確使用mockito？

我有一個函式，我想在其中替換某些組件部分（余弦、正弦、...）的行為，我正在嘗試為這些部分創建一個模擬并將它們傳遞給函式。

class Function1Test {
private static final double accuracy = 10e-5;
static Function1 firstFunction;
static Function2 secondFunction;
static TrFunc.MyCos cos;
static TrFunc.MySin sin;
static TrFunc.MyTan tan;
static TrFunc.MySec sec;
static LgFunc.Log2 log2;
static LgFunc.Log3 log3;
static LgFunc.Log5 log5;
static LgFunc.Log10 log10;
static Func_System sys;
@BeforeAll
static void setUp() {
    cos = mock(TrFunc.MyCos.class);
    sin = mock(TrFunc.MySin.class);
    tan = mock(TrFunc.MyTan.class);
    sec = mock(TrFunc.MySec.class);
    firstFunction = new Function1(cos, sin, tan, sec);
    log2 = mock(LgFunc.Log2.class);
    log3 = mock(LgFunc.Log3.class);
    log5 = mock(LgFunc.Log5.class);
    log10 = mock(LgFunc.Log10.class);
    secondFunction = new Function2(log2, log3, log5, log10);
    sys = new Func_System(firstFunction, secondFunction);
}

static Stream<Arguments> valuesRangeProvider(){
    return Stream.of(
            arguments(-6.282185307179586, 1001001.3330000667),
            arguments(-0.161592653589793, 33.496935752492160)
    );
}
@DisplayName("Integration Test with Mocks")
@ParameterizedTest(name = "{index}: Check range of values, x = {0}")
@MethodSource("valuesRangeProvider")
void test_0(double value, double expected) throws Exception {
    when(firstFunction.sin.mySin(value, accuracy)).thenReturn(sin(value));
    when(firstFunction.cos.myCos(value, accuracy)).thenReturn(cos(value));
    when(firstFunction.tang.myTan(value, accuracy)).thenReturn(sin(value)/cos(value));
    when(firstFunction.sec.mySec(value, accuracy)).thenReturn(1/cos(value));
    assertEquals(expected, firstFunction.calculate(value, accuracy), accuracy);
}

問題是，我收到以下訊息：

*org.mockito.exceptions.misusing.MissingMethodInvocationException: when() 需要一個引數，該引數必須是“模擬方法呼叫”。例如：when(mock.getArticles()).thenReturn(articles); 此外，可能會出現此錯誤，因為：

1. 你存根其中之一：final/private/equals()/hashCode() 方法。這些方法不能被存根/驗證。不支持在非公共父類上宣告的模擬方法。
2. 在 when() 中，您不會在模擬上呼叫方法，而是在其他物件上呼叫方法。*

這些方法都不是私有的或最終的

public class TrFunc {
public static class MyCos {
    public static double myCos(double x, double accuracy) throws Exception {
        if (accuracy < 0){
            throw new Exception("The accuracy below zero");
        }
        double theta_norm = Math.abs(x);
        theta_norm -= Math.floor(theta_norm/Math.PI/2)*2*Math.PI;
        double result = 1;
        double step = 1;
        int i;
        for (i = 1; step > accuracy && i != Integer.MAX_VALUE; i  ){
            step = step*theta_norm*theta_norm/(2*i-1)/(2*i);
            if (i % 2 == 1){
                result -= step;
            } else {
                result  = step;
            }
        }
        if (!Double.isFinite(result) || i == Integer.MAX_VALUE-1){
            throw new Exception("Too many iterations");
        }
        return result;
    }


    private static double factorial(int numer) {
        double factorial = 1.0d;

        while (numer != 0) {
            factorial *= numer--;
        }

        return factorial;
    }
}

public static class MySin {
    public static double mySin(double x, double accuracy) throws Exception {
        return MyCos.myCos(Math.PI/2 - x, accuracy);
    }
}

public static class MyTan {
    public static double myTan(double x, double accuracy) throws Exception {
        double divisor =  MyCos.myCos(x, accuracy);
        if (Math.abs(divisor) <= accuracy) throw new Exception("Division by zero");
        return MySin.mySin(x, accuracy) / divisor;
    }
}

public static class MySec {
    public static double mySec(double x, double accuracy) throws Exception {
        double divisor =  MyCos.myCos(x, accuracy);
        if (Math.abs(divisor) <= accuracy) throw new Exception("Division by zero");
        if ((x   Math.PI / 2) / Math.PI % 1 == 0) throw new Exception("x can't be Pi*n-Pi/2");
        return 1 / divisor;
    }
}
}

uj5u.com熱心網友回復：

在這種情況下，您試圖在實用程式類上模擬靜態方法，而 Mockito 不允許這樣做。有關更多詳細資訊，請參閱使用 Mockito 模擬靜態方法。

如果您在這里嘗試測驗的是數學的有效性，您可以簡單地使用基本斷言對它們進行單元測驗。如果您想在測驗中使用模擬，您可以探索上述帖子中建議的替代方案，或者重組您的代碼以依賴非靜態方法。

假設 Function1 只是傳遞給它的變數的持有者，對于您要更改的每個內部類：

public static class MySin {
    public static double mySin(double x, double accuracy) throws Exception {
        return MyCos.myCos(Math.PI/2 - x, accuracy);
    }
}

到

public static class MySin {
    public double mySin(double x, double accuracy) throws Exception {
        return MyCos.myCos(Math.PI/2 - x, accuracy);
    }
}

注意方法上洗掉的靜態修飾符。

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