ViewAssertion

public interface ViewAssertion

负责在View元素上执行断言。

这被认为是测试框架公共API的一部分 - 只要满足以下要求，开发人员可以自由编写自己的断言：

• Do not mutate the passed in view.
• Throw junit.framework.AssertionError when the view assertion does not hold.
• Implementation runs on the UI thread - so it should not do any blocking operations
• Downcasting the view to a specific type is allowed, provided there is a test that view is an instance of that type before downcasting. If not, an AssertionError should be thrown.
• It is encouraged to access non-mutating methods on the view to perform assertion.

在编写自己的断言之前，请强烈考虑通过ViewAssertions实用程序类使用现有的ViewAssertion。

Summary

Public methods

void check (View view, 
                NoMatchingViewException noViewFoundException)