diff --git a/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/AbstractFirDiagnosticsSmokeTest.kt b/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/AbstractFirDiagnosticsSmokeTest.kt
index 524c127335d..adda35d6cea 100644
--- a/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/AbstractFirDiagnosticsSmokeTest.kt
+++ b/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/AbstractFirDiagnosticsSmokeTest.kt
@@ -132,17 +132,7 @@ abstract class AbstractFirDiagnosticsSmokeTest : BaseDiagnosticsTest() {
     private val builtInsModuleInfo = BuiltInModuleInfo(Name.special("<built-ins>"))
 
     protected open fun createModule(moduleName: String): TestModuleInfo {
-        val nameSuffix = moduleName.substringAfterLast("-", "").toUpperCase()
-        @Suppress("UNUSED_VARIABLE")
-        val platform =
-            when {
-                nameSuffix.isEmpty() -> null // TODO(dsavvinov): this leads to 'null'-platform in ModuleDescriptor
-                nameSuffix == "COMMON" -> CommonPlatforms.defaultCommonPlatform
-                nameSuffix == "JVM" -> JvmPlatforms.unspecifiedJvmPlatform // TODO(dsavvinov): determine JvmTarget precisely
-                nameSuffix == "JS" -> JsPlatforms.defaultJsPlatform
-                nameSuffix == "NATIVE" -> KonanPlatforms.defaultKonanPlatform
-                else -> throw IllegalStateException("Can't determine platform by name $nameSuffix")
-            }
+        parseModulePlatformByName(moduleName)
         return TestModuleInfo(Name.special("<$moduleName>"))
     }
 
diff --git a/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsTest.kt b/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsTest.kt
index c1375b9fd97..9e622c4b2a0 100644
--- a/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsTest.kt
+++ b/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsTest.kt
@@ -589,16 +589,7 @@ abstract class AbstractDiagnosticsTest : BaseDiagnosticsTest() {
         emptyList()
 
     protected open fun createModule(moduleName: String, storageManager: StorageManager): ModuleDescriptorImpl {
-        val nameSuffix = moduleName.substringAfterLast("-", "").toUpperCase()
-        val platform =
-            when {
-                nameSuffix.isEmpty() -> null // TODO(dsavvinov): this leads to 'null'-platform in ModuleDescriptor
-                nameSuffix == "COMMON" -> CommonPlatforms.defaultCommonPlatform
-                nameSuffix == "JVM" -> JvmPlatforms.unspecifiedJvmPlatform // TODO(dsavvinov): determine JvmTarget precisely
-                nameSuffix == "JS" -> JsPlatforms.defaultJsPlatform
-                nameSuffix == "NATIVE" -> KonanPlatforms.defaultKonanPlatform
-                else -> throw IllegalStateException("Can't determine platform by name $nameSuffix")
-            }
+        val platform = parseModulePlatformByName(moduleName)
         val builtIns = JvmBuiltIns(storageManager, JvmBuiltIns.Kind.FROM_CLASS_LOADER)
         return ModuleDescriptorImpl(Name.special("<$moduleName>"), storageManager, builtIns, platform)
     }
diff --git a/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt b/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt
index 16414726051..38031c01f1a 100644
--- a/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt
+++ b/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt
@@ -42,15 +42,20 @@ import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
 import org.jetbrains.kotlin.diagnostics.*
 import org.jetbrains.kotlin.load.java.InternalFlexibleTypeTransformer
 import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.platform.CommonPlatforms
 import org.jetbrains.kotlin.psi.KtDeclaration
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.platform.TargetPlatform
+import org.jetbrains.kotlin.platform.js.JsPlatforms
+import org.jetbrains.kotlin.platform.jvm.JvmPlatforms
+import org.jetbrains.kotlin.platform.konan.KonanPlatforms
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValueFactoryImpl
 import org.jetbrains.kotlin.test.KotlinTestUtils
 import org.jetbrains.kotlin.utils.addIfNotNull
 import org.junit.Assert
 import java.io.File
+import java.lang.IllegalStateException
 import java.util.*
 import java.util.regex.Pattern
 import kotlin.reflect.jvm.javaField
@@ -473,4 +478,17 @@ abstract class BaseDiagnosticsTest : KotlinMultiFileTestWithJava<TestModule, Tes
     }
 
     private fun parseJvmTarget(directiveMap: Map<String, String>) = directiveMap[JVM_TARGET]?.let { JvmTarget.fromString(it) }
+
+    protected fun parseModulePlatformByName(moduleName: String): TargetPlatform? {
+        val nameSuffix = moduleName.substringAfterLast("-", "").toUpperCase()
+        return when {
+            nameSuffix == "COMMON" -> CommonPlatforms.defaultCommonPlatform
+            nameSuffix == "JVM" -> JvmPlatforms.unspecifiedJvmPlatform // TODO(dsavvinov): determine JvmTarget precisely
+            nameSuffix == "JS" -> JsPlatforms.defaultJsPlatform
+            nameSuffix == "NATIVE" -> KonanPlatforms.defaultKonanPlatform
+            nameSuffix.isEmpty() -> null // TODO(dsavvinov): this leads to 'null'-platform in ModuleDescriptor
+            else -> throw IllegalStateException("Can't determine platform by name $nameSuffix")
+        }
+    }
+
 }