Add a test case

Author: pomadchin

plugin/src/sbt-test/sbt-jni/simple cargo with space/README.md

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+Very basic Rust/Cargo test.

plugin/src/sbt-test/sbt-jni/simple cargo with space/build.sbt

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+ivyLoggingLevel := UpdateLogging.Quiet
+
+lazy val root = (project in file(".")).aggregate(core, native)
+
+lazy val core = project
+  .settings(
+    libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.17" % Test,
+    sbtJniCoreScope := Compile
+  )
+  .dependsOn(native % Runtime)
+
+lazy val native = project
+  .settings(nativeCompile / sourceDirectory := baseDirectory.value) // `baseDirectory`, not `sourceDirectory`
+  .enablePlugins(JniNative)

plugin/src/sbt-test/sbt-jni/simple cargo with space/core/src/main/scala/simplecargo/Adder.scala

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+package simplecargo
+
+import com.github.sbt.jni.syntax.NativeLoader
+
+class Adder(val base: Int) extends NativeLoader("adder") {
+  @native def plus(term: Int): Int // implemented in libadder.so
+}

plugin/src/sbt-test/sbt-jni/simple cargo with space/core/src/main/scala/simplecargo/Main.scala

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+package simplecargo
+
+object Main {
+
+  def main(args: Array[String]): Unit = {
+    println("hello")
+    val adder = new Adder(1)
+    val sum = adder.plus(2)
+    println(s"sum: $sum")
+  }
+
+}

plugin/src/sbt-test/sbt-jni/simple cargo with space/core/src/test/scala/simplecargo/Test.scala

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+package simplecargo
+
+import org.scalatest.flatspec._
+
+class SimpleSpec extends AnyFlatSpec {
+
+  "Calling native methods in tests" should "work" in {
+    assert(new Adder(12).plus(34) == 46)
+  }
+
+}

plugin/src/sbt-test/sbt-jni/simple cargo with space/native/Cargo.toml

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+[package]
+name = "adder"
+version = "0.1.0"
+authors = ["John Doe <[email protected]>"]
+edition = "2018"
+
+[dependencies]
+jni = "0.19"
+
+[lib]
+crate_type = ["cdylib"]

plugin/src/sbt-test/sbt-jni/simple cargo with space/native/src/lib.rs

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+// This is the interface to the JVM that we'll call the majority of our
+// methods on.
+use jni::JNIEnv;
+
+// These objects are what you should use as arguments to your native
+// function. They carry extra lifetime information to prevent them escaping
+// this context and getting used after being GC'd.
+use jni::objects::JObject;
+
+use jni::sys::jint;
+
+// This keeps Rust from "mangling" the name and making it unique for this
+// crate.
+#[no_mangle]
+pub extern "system" fn Java_simplecargo_Adder_plus(
+  env: JNIEnv,
+  object: JObject,
+  term: jint,
+) -> jint {
+  let base = env.get_field(object, "base", "I").unwrap().i().unwrap();
+  println!("Printing from rust library. base: {}", base);
+  println!("Printing from rust library. term: {}", term);
+  base + term
+}

plugin/src/sbt-test/sbt-jni/simple cargo with space/project/ScriptedHelper.scala

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+import sbt._
+import sbt.Keys._
+
+object ScriptedHelper extends AutoPlugin {
+
+  override def requires = empty
+  override def trigger = allRequirements
+
+  override def projectSettings = Seq(
+    scalacOptions ++= Seq("-feature", "-deprecation"),
+    crossScalaVersions := Seq("2.13.12", "2.12.18"),
+    scalaVersion := crossScalaVersions.value.head
+  )
+
+}

plugin/src/sbt-test/sbt-jni/simple cargo with space/project/build.properties

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+sbt.version=1.9.6

plugin/src/sbt-test/sbt-jni/simple cargo with space/project/plugins.sbt

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+ivyLoggingLevel := UpdateLogging.Quiet
+
+addSbtPlugin("com.github.sbt" % "sbt-jni" % System.getProperty("plugin.version"))

plugin/src/sbt-test/sbt-jni/simple cargo with space/test

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+> nativeInit cargo adder
+> +test
+> +core/run