Pro Kotlin Web Apps from Scratch by 2023
Author:2023
Language: eng
Format: epub
Chapter 7 automated tests with junit 5
Making the Test Pass
To make the test pass, youâll need to implement the getUser function.
You already have all the facilities you need to implement it. Youâve set up Kotliquery to run queries, your test passes a Kotliquery session to getUser, and you have a data class with mapping from table data to the User? type that getUser returns. Listing 7-15
shows how to implement it correctly.
Listing 7-15. A working implementation of getUser
fun getUser(dbSess: Session, id: Long): User? {
return dbSess
.single(
queryOf("SELECT * FROM user_t WHERE id = ?", id),
::mapFromRow
)
?.let(User::fromRow)
}
If you rerun your test, it should run without any assertion errors. Youâve now verified that if you havenât implemented getUser correctly, the test will fail. And by writing the test first, you made sure that it was easy to invoke getUser without any context other than database state and a Kotliquery session.
Notes on Methodology
You now have everything you need to write and run tests that execute your business logic code and assert that they yielded the expected and required outputs. For the remainder of this chapter, youâll learn more about the methodologies of testing and the thoughts behind why youâre doing what youâre doing.
What About Front-End Tests?
Iâm not covering the world of JavaScript and front-end development in any depth in
this book.
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