1 files changed, 17 insertions, 0 deletions
diff --git a/testApi/src/main/kotlin/org/jetbrains/dokka/testApi/utils/assertIsInstance.kt b/testApi/src/main/kotlin/org/jetbrains/dokka/testApi/utils/assertIsInstance.kt
new file mode 100644
index 00000000..00c00ebb
--- /dev/null
+++ b/testApi/src/main/kotlin/org/jetbrains/dokka/testApi/utils/assertIsInstance.kt
@@ -0,0 +1,17 @@
+package org.jetbrains.dokka.testApi.utils
+
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.contract
+
+@OptIn(ExperimentalContracts::class)
+inline fun <reified T> assertIsInstance(obj: Any?): T {
+    contract {
+        returns() implies (obj is T)
+    }
+
+    if (obj is T) {
+        return obj
+    }
+
+    throw AssertionError("Expected instance of type ${T::class.qualifiedName} but found $obj")
+}