让我们假装 OPERATOR 代码的路径将这些布尔值设置为false：

@Test
fun `must show toast message when onValidationSucceeded is called and signature is Operator`() {
    // Given
    signatureSigned("unusedName", "unusedSig", null, SignatureType.OPERATOR) 
`when`(app.getString(R.string.quality_control_signatures_not_complete)).thenReturn("Operator and Engineer signature required")
    // When
    presenter.onValidationSucceeded()
    // Then
    verify(view).showToastMessage("Operator and Engineer signature required")
}

（不得不假装，因为现在你共享的代码只会将布尔值设为真）。
现在您正在对类行为进行单元测试，而不是测试该行为是如何编码的。例如，现在如果那些布尔值被重构为int值。这次考试你不用碰它也能通过，这是件好事！
或者如果你的代码保持原样。你可以这样测试：

@Test
fun `must show toast message when onValidationSucceeded is called and has not been signature signed`() {
    // Given
    // We haven't signature signed (see verify)
   `when`(app.getString(R.string.quality_control_signatures_not_complete)).thenReturn("Operator and Engineer signature required")
    // When
    presenter.onValidationSucceeded()
    // Then
    verify(view).showToastMessage("Operator and Engineer signature required")
    verify(view, never()).operatorSignatureSigned()
    verify(view, never()).engineerSignatureSigned()
}

如何模拟静态方法（提示您不需要，请将其移动到系统边缘，稍后再考虑）。
你现在的班级：

class MyClass {

    override fun signatureSigned(name: String, svgSignature: String, bitmapSignature: Bitmap, signatureType: SignatureType) {
        val svgSignatureGzipped = CompressionTools.gzipCompress(svgSignature)
        ...
    }

}

所以您需要删除静态调用，对于另一个可以作为依赖项执行静态调用的类。

interface SignatureCompressor {
    fun compress(signature: String)
}

class GZipSignatureCompressor : SignatureCompressor {
    override fun compress(signature: String) {
        return CompressionTools.gzipCompress(signature)
    } 
}

现在你的班级变成：

class MyClass(private val compressor: SignatureCompressor) {

    override fun signatureSigned(name: String, svgSignature: String, bitmapSignature: Bitmap, signatureType: SignatureType) {
        val svgSignatureGzipped = compressor.compress(svgSignature)
        ...
    }

}

你可以模拟压缩机：

val cut = MyClass(mockk())

如果只有一个压缩实现，那么也不需要接口