#430: Add container initialization, run simple commant inside container and print the result of them

Author: DmitryNekrasov

core/jvm/test/testcontainers/TimeZoneTest.kt

@@ -5,25 +5,31 @@
 
 package testcontainers
 
-import kotlinx.datetime.*
+import org.testcontainers.junit.jupiter.Container
 import org.testcontainers.junit.jupiter.Testcontainers
 import java.nio.file.Paths
-import java.nio.file.Files
-import kotlin.test.Test
-import kotlin.test.assertNotEquals
+import org.junit.jupiter.api.Test
 
 @Testcontainers
 class TimeZoneTest {
 
-    @Test
-    fun test() {
-        val tz = TimeZone.currentSystemDefault()
-        assertNotEquals(TimeZone.UTC, tz)
-        println("System time zone: $tz")
+    @Container
+    val originalContainer = TimezoneTestContainer(
+        Paths.get("./jvm/test/testcontainers/original/Dockerfile"),
+        "ubuntu-arctic-longyearbyen"
+    )
 
-        val filePath = Paths.get("./jvm/test/testcontainers/original/Dockerfile")
-        val content = String(Files.readAllBytes(filePath), Charsets.UTF_8)
-        println("Dockerfile content: \n$content")
+    @Container
+    val modifiedContainer = TimezoneTestContainer(
+        Paths.get("./jvm/test/testcontainers/modified/Dockerfile"),
+        "ubuntu-new-longyearbyen-modified"
+    )
 
+    @Test
+    fun test() {
+        val originalExecResult = originalContainer.runTest()
+        val modifiedExecResult = modifiedContainer.runTest()
+        println(originalExecResult.stdout)
+        println(modifiedExecResult.stdout)
     }
 }

core/jvm/test/testcontainers/TimezoneTestContainer.kt

@@ -0,0 +1,23 @@
+/*
+ * 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 testcontainers
+
+import org.testcontainers.containers.Container.ExecResult
+import org.testcontainers.containers.GenericContainer
+import org.testcontainers.images.builder.ImageFromDockerfile
+import java.nio.file.Path
+
+class TimezoneTestContainer(dockerfilePath: Path, val imageName: String) :
+    GenericContainer<TimezoneTestContainer>(ImageFromDockerfile(imageName).withDockerfile(dockerfilePath)) {
+
+    init {
+        withCommand("tail -f /dev/null")
+    }
+
+    fun runTest(): ExecResult {
+        return execInContainer("bash", "-c", "echo Inside container $imageName, system time zone: $(date -R)")
+    }
+}