为什么没有“从不分配字段"? @Mock警告 [英] Why no "field is never assigned" warning with @Mock
问题描述
如果在测试类中声明私有字段:
If you declare a private field in a test class:
private Foo foo;
这已被使用，但从未分配，当我将鼠标悬停在声明上时，IntelliJ IDEA(可能还有其他IDE)会显示警告，并且将其呈现为灰色
That gets used but is never assigned, IntelliJ IDEA (and presumably other IDEs) show a warning when I hover over the declaration, and it renders it gray
私有字段"foo"从未分配
但是，如果我使用Mockito并像这样注释字段:
But if I'm using Mockito and annotate the field like:
@Mock
private Foo foo;
@Mock
private Foo foo;
警告消失，并以紫色显示该字段以表示已分配该字段. IDE如何知道@Mock的含义?我浏览了Mockito源代码，注释定义似乎没有任何内容，我的IDE也没有Mockito插件.
The warning disappears and renders the field in purple to indicate that it is assigned. How does the IDE know what @Mock implies? I've had a look through the Mockito source code and there doesn't seem to be anything on the annotation definition and my IDE doesn't have a Mockito plugin.
我正在编写一个类似于Mockito的带有等效注释的库，我很想知道让IDE删除警告.
I'm writing a library similar to Mockito with an equivilant annotation and I'd love to know to get the IDE to remove the warning.
(我不是Java开发人员，所以如果我说错了，请纠正我)
(I'm not a Java developer, so if I've said anything wrong please correct me)
编辑 我已经在Eclipse中进行了尝试，实际上它删除了带有任何批注的警告，这就是@nikpon的建议.
EDIT I've tried this in Eclipse and it actually removes the warning with any annotation, which is what @nikpon was suggesting.
推荐答案
IntelliJ IDEA中的未使用符号"检查对此注释进行了特殊配置.
The "unused symbol" inspection in IntelliJ IDEA has special configuration for this annotation.
在 intellij-社区代码库显示了
A quick search for "org.mockito.Mock" in the intellij-community code base reveals the JUnitEntryPoint class, which plugs into the "deadCode" extension point.
The entry points contributed through this mechanism are in turn queried by inspections like UnusedDeclarationInspection.
请注意，检查具有配置窗格，您可以在其中配置其他自定义注释，这些注释应防止将字段标记为未使用.
Note that the inspection has a configuration pane where you can configure additional custom annotations that should prevent a field from being marked as unused.
您可以从 Settings-> Inspections 访问此配置，然后按名称搜索未使用的符号"检查: 未使用符号"检查配置的屏幕截图
You can access this configuration from Settings->Inspections, then search for the "unused symbol" inspection by name: screenshot of the "unused symbol" inspection configuration
为方便起见，您也可以直接输入以下设置，方法是:当插入符号位于IDEA标记为未使用的字段上时，调用 Alt-Enter : 通过在未使用的字段上调用Alt-Enter来访问未使用的符号"设置的屏幕截图
For convenience, you can also navigate to these settings directly, by invoking Alt-Enter while the caret is on a field marked as unused by IDEA: screenshot of accessing the "unused symbol" settings by invoking Alt-Enter on an unused field
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