From 17bbedbc50f90550d3c3e6ba1246ba5290009e9b Mon Sep 17 00:00:00 2001
From: Dmitriy Novozhilov <dmitriy.novozhilov@jetbrains.com>
Date: Mon, 2 Aug 2021 17:45:46 +0300
Subject: [PATCH] [Test] Fix FileComparisonFailureFirst comparator to keep
 sorting stability

---
 .../jetbrains/kotlin/test/services/JUnit5Assertions.kt   | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/services/JUnit5Assertions.kt b/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/services/JUnit5Assertions.kt
index 3f5ec7271cd..9ecc85f3f9f 100644
--- a/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/services/JUnit5Assertions.kt
+++ b/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/services/JUnit5Assertions.kt
@@ -76,8 +76,13 @@ object JUnit5Assertions : AssertionsService() {
     }
 
     private object FileComparisonFailureFirst : Comparator<Throwable> {
-        override fun compare(o1: Throwable?, o2: Throwable?): Int {
-            return if (o1 is FileComparisonFailure) -1 else 0
+        override fun compare(o1: Throwable, o2: Throwable): Int {
+            return when {
+                o1 is FileComparisonFailure && o2 is FileComparisonFailure -> 0
+                o1 is FileComparisonFailure -> -1
+                o2 is FileComparisonFailure -> 1
+                else -> 0
+            }
         }
     }
 }