Use a local copy of Kotlin Compile Testing

tschuchortdev/kotlin-compile-testing#394 works as needed, but isn't released. This unblocks Poko from that release.

Author: drewhamilton

gradle/libs.versions.toml

@@ -4,7 +4,8 @@
 androidx-compose-compiler = "1.5.4-dev-k1.9.20-Beta2-ac5f960bdaf"
 androidx-compose-runtime = "1.5.4"
 kotlin = "1.9.20-Beta2"
-kotlinCompileTesting = "1.5.0"
+# If this ends with "-local", we use a checked-in jar instead of the public artifact:
+kotlinCompileTesting = "1.5.1-pr394-local"
 kotlinCompileTestingFork = "0.3.2"
 # https://github.com/google/ksp/releases:
 ksp = "1.9.20-Beta2-1.0.13"

poko-compiler-plugin/build.gradle.kts

@@ -20,10 +20,21 @@ dependencies {
 
     testImplementation(project(":poko-annotations"))
     testImplementation(libs.kotlin.embeddableCompiler)
-    testImplementation(libs.kotlin.compileTesting)
     testImplementation(libs.junit)
     testImplementation(libs.assertk)
     testImplementation(libs.testParameterInjector)
+    val kctVersion = libs.versions.kotlinCompileTesting.get()
+    if (kctVersion.endsWith("-local")) {
+        // Include the local KCT jar and its copied dependencies
+        val kctName = libs.kotlin.compileTesting.get().name
+        testImplementation(files("libs/$kctName-$kctVersion.jar"))
+        // Copied from KCT's build.gradle:
+        testImplementation("com.squareup.okio:okio:3.3.0")
+        testImplementation("io.github.classgraph:classgraph:4.8.158")
+        testImplementation("org.jetbrains.kotlin:kotlin-annotation-processing-embeddable:${libs.versions.kotlin.get()}")
+    } else {
+        testImplementation(libs.kotlin.compileTesting)
+    }
 }
 
 tasks.withType<KotlinCompile>().configureEach {