dependency error

[BlackWhite7]

URL of codelab:
https://developer.android.com/codelabs/basic-android-kotlin-compose-add-repository?continue=https%3A%2F%2Fdeveloper.android.com%2Fcourses%2Fpathways%2Fandroid-basics-compose-unit-5-pathway-2%23codelab-https%3A%2F%2Fdeveloper.android.com%2Fcodelabs%2Fbasic-android-kotlin-compose-add-repository&_gl=1*4ahl6p*_up*MQ..*_ga*MTY4ODkyMjI1OS4xNzMyMjYwMjI4*_ga_6HH9YJMN9M*MTczMjI2MDIyOC4xLjAuMTczMjI2MDIyOC4wLjAuMjEwNzczNjUwNw..#6

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In which task and step of the codelab can this issue be found?
[7. Get setup for local tests]

Describe the problem
When you add the local test dependencies, the document suggests like this.
testImplementation("junit:junit:4.13.2")
testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.1")

But, in the code, when you use runTest() lambda function,
JavaStudio can not import kotlinx.coroutines.test package for runTest.

To get around this problem, I have to change the second dependency to real 'implementaion' like this.
testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.1")
---> implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.1")

Steps to reproduce?

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Versions
Android Studio version:
API version of the emulator:

Additional information
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[BlackWhite7]

I have checked my test file location. It is in the src/androidTest/java/ < my_ package> . I have changed the location to src/test/java/<my_package> .   My test is for unit tests not for instrumented tests.  There is no more problem.I have checked my test file location. It is in the src/androidTest/java/ < my_ package> . I have changed the location to src/test/java/<my_package> .   My test is for unit tests not for instrumented tests.  There is no more problem.