Question

请参阅我创建的以下单元测试：

import android.graphics.PointF
import org.junit.Assert.assertEquals
import org.junit.Test


class SimpleTest {
    data class A(val x: Float, val y: Float) {
        val origin = PointF(x, y)
        val origin1 by lazy { PointF(x, y) }
    }

    val sut = A(10f, 10f)

    @Test fun succeed() {
        assertEquals(10f, sut.x)
        assertEquals(10f, sut.y)
    }

    @Test fun failed() {
        assertEquals(10f, sut.origin.x)
        assertEquals(10f, sut.origin.y)
    }

    @Test fun failed1() {
        assertEquals(10f, sut.origin1.x)
        assertEquals(10f, sut.origin1.y)
    }
}

第二个和第三个测试用例失败并出现错误：

java.lang.AssertionError: 
Expected :10.0
Actual   :0.0

显然，当用于初始化PointF时，原始浮点数变为0，如果用于初始化RectF，则同样适用。

这个错误彻底打动了我的脑海，这是Kotlin的一个错误吗？

更新：

我已经确认这三个测试用例是作为检测测试传递的，这证明了Android类的存根是导致测试失败的原因。但是，我仍然在我的应用程序中观察到同样的问题 - 这不是单元测试......

data class Viewport(val x: Float, val y: Float, val w: Int, val h: Int, val scale: Float) {
    val origin = Point2D(x, y)

    val bound = RectF(x, y, x + w * scale, y + h * scale)
    ....
 }

在应用程序的某个地方，我有以下logcat语句：

Log.d(TAG, "viewport=$viewport, origin=${viewport!!.origin}, bound=${viewport!!.bound}")

我得到的logcat输出是：

01-05 12:53:17.376 10870-10870/com.quirklogic.ink D/Painter: viewport=Viewport(x=-292.81342, y=-39.189453, w=720, h=1280, scale=1.0), origin=Point2D(x=-292.81342, y=-39.189453), bound=RectF(0.0, 0.0, 720.0, 1280.0)
01-05 12:53:17.412 10870-10870/com.quirklogic.ink D/Painter: viewport=Viewport(x=-292.81342, y=-39.189453, w=720, h=1280, scale=1.0), origin=Point2D(x=-292.81342, y=-39.189453), bound=RectF(0.0, 0.0, 720.0, 1280.0)
01-05 12:53:17.431 10870-10870/com.quirklogic.ink D/Painter: viewport=Viewport(x=-292.81342, y=-39.189453, w=720, h=1280, scale=1.0), origin=Point2D(x=-292.81342, y=-39.189453), bound=RectF(0.0, 0.0, 720.0, 1280.0)
01-05 12:53:17.448 10870-10870/com.quirklogic.ink D/Painter: viewport=Viewport(x=-292.81342, y=-39.189453, w=720, h=1280, scale=1.0), origin=Point2D(x=-292.81342, y=-39.189453), bound=RectF(0.0, 0.0, 720.0, 1280.0)
01-05 12:53:17.468 10870-10870/com.quirklogic.ink D/Painter: viewport=Viewport(x=-292.81342, y=-39.189453, w=720, h=1280, scale=1.0), origin=Point2D(x=-292.81342, y=-39.189453), bound=RectF(0.0, 0.0, 720.0, 1280.0)
01-05 12:53:17.487 10870-10870/com.quirklogic.ink D/Painter: viewport=Viewport(x=-292.81342, y=-39.189453, w=720, h=1280, scale=1.0), origin=Point2D(x=-292.81342, y=-39.189453), bound=RectF(0.0, 0.0, 720.0, 1280.0)
01-05 12:53:17.501 10870-10870/com.quirklogic.ink D/Painter: viewport=Viewport(x=-292.81342, y=-39.189453, w=720, h=1280, scale=1.0), origin=Point2D(x=-292.81342, y=-39.189453), bound=RectF(0.0, 0.0, 720.0, 1280.0)

UPDATE2：

我发现确实是我自己的错，我改变了将其重置为（0,0）原点的界限。不是Kotlin的问题。

Answer 1

这适用于一个简单的自构数据类-f FILE而没有错误：

PointF

此处android.graphics.PointF无效。

当用于在Kotlin Android中初始化PointF或RectF时，Float原始神奇地变为0

1 个答案: