Test for assertInstanceOf nullable upcast

Issue: junit-team#1866
awelless · Aug 27, 2023 · 43c08ea · 43c08ea
1 parent 437d29e
commit 43c08ea
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/junit-jupiter-engine/src/test/kotlin/org/junit/jupiter/api/KotlinAssertionsTests.kt b/junit-jupiter-engine/src/test/kotlin/org/junit/jupiter/api/KotlinAssertionsTests.kt
@@ -236,6 +236,14 @@ class KotlinAssertionsTests {
         assertFalse(string.isEmpty()) // smart cast to a String object
     }
 
+    @Test
+    fun `assertInstanceOf with compiler nullable smart cast`() {
+        val string: Any? = "string"
+
+        assertInstanceOf<String>(string)
+        assertFalse(string.isEmpty()) // smart cast to a non-null String object
+    }
+
     @Test
     fun `assertInstanceOf with a null value`() {
         val error = assertThrows<AssertionFailedError> {