Fix tests broken in c6fa3634

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt

@@ -514,8 +514,9 @@ abstract class BaseGradleIT {
         assertNull(regex.find(output), "Output should not contain '$regex'")
     }
 
-    fun CompiledProject.assertNoWarnings() {
-        val warnings = "w: .*".toRegex().findAll(output).map { it.groupValues[0] }
+    fun CompiledProject.assertNoWarnings(sanitize: (String) -> String = { it }) {
+        val clearedOutput = sanitize(output)
+        val warnings = "w: .*".toRegex().findAll(clearedOutput).map { it.groupValues[0] }
 
         if (warnings.any()) {
             val message = (listOf("Output should not contain any warnings:") + warnings).joinToString(SYSTEM_LINE_SEPARATOR)

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt

@@ -182,7 +182,7 @@ class KotlinGradleIT : BaseGradleIT() {
 
         project.build("build", options = options) {
             assertSuccessful()
-            assertNoWarnings()
+            assertNoWarnings { removeFirWarning(it) }
         }
 
         val greeterKt = project.projectDir.getFileByName("Greeter.kt")
@@ -192,7 +192,7 @@ class KotlinGradleIT : BaseGradleIT() {
 
         project.build("build", options = options) {
             assertSuccessful()
-            assertNoWarnings()
+            assertNoWarnings { removeFirWarning(it) }
             val affectedSources = project.projectDir.getFilesByNames(
                 "Greeter.kt", "KotlinGreetingJoiner.kt",
                 "TestGreeter.kt", "TestKotlinGreetingJoiner.kt"
@@ -201,6 +201,14 @@ class KotlinGradleIT : BaseGradleIT() {
         }
     }
 
+    private fun removeFirWarning(output: String): String {
+        return output.replace(
+            """w: ATTENTION!
+ This build uses in-dev FIR: 
+  -Xuse-fir""", ""
+        )
+    }
+
     @Test
     fun testManyClassesIC() {
         val project = Project("manyClasses")