Java Junit toString部分覆盖

我在NetBeans中对字符串类进行junit测试：

public String toString() {
        try {
            return "I am ContainerTruck " + getIdentifier() + ".\n\tI am at "
                    + getLocation() + " and am heading to " + getDestination()
                    + ".\n\tMy load is " + getCurrentLoadWeight() + " and my max load is "
                    + getMaxLoadWeight() + ".\n\tDistance to my destination is "
                    + String.format("%4.2f", distance(getDestination())) + ". "
                    + (atDestination() ? "I am there!" : "I'm not there yet");
        } catch (InvalidDataException ex) {
            return ex.getMessage();
        }
    }

netbeans一直说我的测试得到了部分覆盖：

public void testToString(){

                double lX = 1.0;
        double lY = 1.0;
        double lZ = 1.0;
        double dX = 1.0;
        double dY = 1.0;
        double dZ = 1.0;
        double spd = 1.0;
        double mxSpd = 1.0;
        double mlw = 1.0;
            try{
        ContainerTruck result = new ContainerTruck(lX, lY, lZ, dX, dY, dZ, spd, mxSpd, mlw);
                IdentifiableImpl imp = new IdentifiableImpl(result.getIdentifier());

        assertNotNull(result);
        assertEquals("I am ContainerTruck " + imp.getIdentifier() + ".\n\tI am at [1.00, 1.00, 1.00] and am heading to [1.00, 1.00, 1.00].\n\tMy load is 0.0 and my max load is 1.0.\n\tDistance to my destination is 0.00. I am there!", result.toString());
        assertEquals(imp.getIdentifier(),result.getIdentifier());
        assertEquals(0.0, result.getCurrentLoadWeight(), delta);
        assertEquals(1.0, result.getLocationZ(), delta);
        assertEquals(1.0, result.getLocationY(), delta);
        assertEquals(1.0, result.getLocationX(), delta);
        assertEquals(1.0, result.getMaxLoadWeight(), delta);
        assertEquals(1.0, result.getDestinationX(), delta);
        assertEquals(true, result.atDestination());
        assertEquals(1.0, result.getDestinationY(), delta);
        assertEquals(1.0, result.getDestinationZ(), delta);
        assertEquals(1.0, result.getSpeed(), delta);
        assertEquals(1.0, result.getMaxSpeed(), delta);
        }catch (InvalidDataException ex) {
            fail(ex.getMessage());
        } 
    }

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有人能给我解释一下为什么这仍然被认为是部分覆盖吗？

您的toString方法考虑的只是一个愉快的场景，您的一些方法不会抛出异常，因此它永远不会进入catch块

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您应该尝试调用该方法，以便进入catch块，在该块中可以返回异常的消息

啊，谢谢！，但我仍然认为我有部分保险问题。基于netbeans，部分覆盖在字符串行上，我不明白为什么会这样。