Skip to content

KT-83131: Add contract to assertNull #5601

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
hfhbd wants to merge 2 commits into
base: master
Choose a base branch
from
Open

KT-83131: Add contract to assertNull #5601

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
5a4c3ec
KT-83131: Add contract to assertNull
hfhbd Dec 16, 2025
f448fac
Add unit test
hfhbd Dec 19, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions libraries/kotlin.test/common/src/main/kotlin/kotlin/test/Assertions.kt
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,7 @@ public inline fun <T : Any, R> assertNotNull(actual: T?, message: String? = null

/** Asserts that the [actual] value is `null`, with an optional [message]. */
public fun assertNull(actual: Any?, message: String? = null) {
contract { returns() implies (actual == null) }
asserter.assertNull(message, actual)
}

Expand Down
5 changes: 4 additions & 1 deletion libraries/kotlin.test/common/src/test/kotlin/kotlin/test/tests/BasicAssertionsTest.kt
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -286,7 +286,10 @@ class BasicAssertionsTest {

@Test
fun testAssertNull() {
assertNull(null)
val s: String? = null
assertNull(s)
// Smart cast to Nothing?
val kt83131: Nothing? = s
}

@Test
Expand Down