Set up Kotlin wrapper for test server (#63)

* Set up Kotlin wrapper for test server

* Add headers & Build gradle package

Author: jaycee-li

scripts/update-sdk-checksums/main.go

@@ -69,6 +69,13 @@ var sdksToUpdate = []SDKConfig{
 		ChecksumsJSONFile: "checksums.json",
 		VersionVarName:    "TEST_SERVER_VERSION",
 	},
+	{
+		Name:              "Kotlin",
+		SDKDir:            "sdks/kotlin",
+		InstallScriptFile: []string{"src/main/kotlin/com/google/testserver/BinaryInstaller.kt"},
+		ChecksumsJSONFile: "checksums.json",
+		VersionVarName:    "TEST_SERVER_VERSION",
+	},
 }
 
 func fetchChecksumsTxt(version string) (string, error) {

sdks/kotlin/build.gradle.kts

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+  kotlin("jvm") version "1.9.22"
+  kotlin("plugin.serialization") version "1.9.22"
+}
+
+kotlin {
+  jvmToolchain(21)
+}
+
+group = "com.google.testserver"
+
+version = "0.1.0-SNAPSHOT"
+
+repositories { mavenCentral() }
+
+dependencies {
+  implementation("org.yaml:snakeyaml:2.2")
+
+  testImplementation(kotlin("test"))
+  testImplementation("org.junit.jupiter:junit-jupiter:5.10.2")
+  testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+tasks.test {
+  useJUnitPlatform()
+  testLogging {
+    events("passed", "skipped", "failed", "standardOut", "standardError")
+    showExceptions = true
+    showCauses = true
+    showStackTraces = true
+    exceptionFormat = org.gradle.api.tasks.testing.logging.TestExceptionFormat.FULL
+  }
+}

sdks/kotlin/checksums.json

@@ -0,0 +1 @@
+{}

sdks/kotlin/gradle/wrapper/gradle-wrapper.jar

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists