Android: Unresolved reference when using junit 4.13

问题

After updating junit version to 4.13 in gradle dependencies, classes and annotations like Assert, @Test, etc. under the junit package are displayed as red when used in my code. Lint check says:

Unresolved reference: <any junit class>

However, when I build and run my tests, it will build and run just fine.

I have tried:

restarting Android Studio
Invalidate caches and restart
Clean and rebuild project
added testImplementation "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"

What works is downgrading junit to 4.12. How to get rid of this lint error, without downgrading version?

Update:

When I check ALT + ENTER options and select Inspection 'Unresolved reference, in wrong test scope' options > Suppress 'IncorrectScope' for file <name of file>, it gets rid of these lint errors for that particular file. I still like to solve this problem without using Suppress though.
According to this issue, it looks like this bug is not fixed yet. For now I'm downgrading to 4.12.
Removing both espresso and runner from dependencies also fixes the problem.

回答1:

Just add the following to your build.gradle (App) file:

configurations.all {
    resolutionStrategy.force "junit:junit:$junit_version"
}

dependencies {
...
}

回答2:

The first of all check your external dependencies In my case I found double jUnit versions which is

Junit 4.12
Junit 4.13

And the older version is come with androidx.test The solution is

1. exclude dependencies

2. remove `androidx.test`

3. add conflict startegy

回答3:

Borrowing from @VaheGharibyan's idea about duplicate junit versions, I discovered that the following code also fixes the problem.

configurations.all {
        resolutionStrategy.dependencySubstitution {
            substitute module('junit:junit:4.12') with module('junit:junit:4.13')
        }
    }

来源：https://stackoverflow.com/questions/59598124/android-unresolved-reference-when-using-junit-4-13

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android

gradle

junit