Fix tests when kx-benchmark and KGP have the same minSupportedGradleVersion

Author: Abduqodiri Qurbonzoda

integration/src/test/kotlin/kotlinx/benchmark/integration/SupportedGradleVersionTest.kt

@@ -9,8 +9,10 @@ class SupportedGradleVersionTest : GradleTest() {
 
     /** The min supported version used in build scripts, provided as a system property. */
     private val minSupportedGradleVersion = System.getProperty("minSupportedGradleVersion")
-    private val warningMessage =
+    private val unsupportedGradleVersionWarningMessage =
         "JetBrains Gradle Benchmarks plugin requires Gradle version ${GradleTestVersion.MinSupportedGradleVersion.versionString}"
+    private val incompatibleKotlinAndGradleVersionsErrorMessage =
+        "The applied Kotlin Gradle is not compatible with the used Gradle version (Gradle ${GradleTestVersion.UnsupportedGradleVersion.versionString})"
 
     @Test
     fun `test MinSupportedGradleVersion matches the version used in build scripts`() {
@@ -31,16 +33,21 @@ class SupportedGradleVersionTest : GradleTest() {
         val runner = project("kotlin-multiplatform", gradleVersion = GradleTestVersion.MinSupportedGradleVersion)
 
         runner.runAndSucceed(":help", "-q") {
-            assertOutputDoesNotContain(warningMessage)
+            assertOutputDoesNotContain(unsupportedGradleVersionWarningMessage)
         }
     }
 
     @Test
     fun `when using unsupported Gradle version, expect warning`() {
         val runner = project("kotlin-multiplatform", gradleVersion = GradleTestVersion.UnsupportedGradleVersion)
 
-        runner.runAndSucceed(":help", "-q") {
-            assertOutputContains(warningMessage)
+        runner.run(":help", "-q") {
+            assertTrue(
+                // When kotlinx-benchmark-plugin has the same minimum supported Gradle version as KGP, reported by KGP
+                output.contains(incompatibleKotlinAndGradleVersionsErrorMessage) ||
+                // When kotlinx-benchmark-plugin has a newer minimum supported Gradle version than KGP, reported by kxb
+                output.contains(unsupportedGradleVersionWarningMessage)
+            )
         }
     }
 }