#430: Replace shouldRunTests check to Testcontainers.runIfAvailable

Author: DmitryNekrasov

core/linux/test/TestcontainersSupport.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2019-2025 JetBrains s.r.o. and contributors.
+ * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
+ */
+
+package kotlinx.datetime.test
+
+import kotlinx.cinterop.ExperimentalForeignApi
+import kotlinx.cinterop.toKString
+import platform.posix.getenv
+
+object Testcontainers {
+
+    @OptIn(ExperimentalForeignApi::class)
+    val available: Boolean
+        get() = getenv("INSIDE_TESTCONTAINERS")?.toKString()?.toBoolean() == true
+
+    inline fun runIfAvailable(block: () -> Unit) {
+        if (available) block() else println("Skipping test that requires testcontainers...")
+    }
+}

core/linux/test/TimeZoneLinuxNativeTest.kt

@@ -5,26 +5,13 @@
 
 package kotlinx.datetime.test
 
-import kotlinx.cinterop.ExperimentalForeignApi
-import kotlinx.cinterop.toKString
 import kotlinx.datetime.*
 import kotlin.test.*
-import platform.posix.getenv
 
 class TimeZoneLinuxNativeTest {
 
-    private var shouldRunTests = false
-
-    @OptIn(ExperimentalForeignApi::class)
-    @BeforeTest
-    fun setup() {
-        shouldRunTests = getenv("INSIDE_TESTCONTAINERS")?.toKString() != null
-    }
-
     @Test
-    fun defaultTimeZoneTest() {
-        if (!shouldRunTests) return
-
+    fun defaultTimeZoneTest() = Testcontainers.runIfAvailable {
         val tz = TimeZone.currentSystemDefault()
         println("TIMEZONE: $tz")
         assertEquals(TimeZone.of("Europe/Oslo"), tz)