Test new, print, and free Config works

jvm/build.gradle

@@ -0,0 +1,40 @@
+plugins {
+    id 'org.jetbrains.kotlin.jvm' // version '1.3.71'
+    id 'java-library'
+    id 'maven-publish'
+}
+
+test {
+    systemProperty "java.library.path", file("${buildDir}/jniLibs/x86_64_linux").absolutePath
+    environment "LD_LIBRARY_PATH", file("${buildDir}/jniLibs/x86_64_linux").absolutePath
+//    testLogging {
+//        events "PASSED", "SKIPPED", "FAILED", "STANDARD_OUT", "STANDARD_ERROR"
+//    }
+}
+
+task buildRust(type: Exec) {
+    workingDir '../'
+    commandLine './build.sh'
+}
+
+dependencies {
+    implementation platform('org.jetbrains.kotlin:kotlin-bom')
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.5.10"
+    implementation "com.fasterxml.jackson.module:jackson-module-kotlin:2.9.+"
+    implementation "net.java.dev.jna:jna:5.8.0"
+    
+    testImplementation 'org.jetbrains.kotlin:kotlin-test'
+    testImplementation 'org.jetbrains.kotlin:kotlin-test-junit'
+}
+
+publishing {
+    publications {
+        maven(MavenPublication) {
+            groupId = 'org.bitcoindevkit.bdkjni'
+            artifactId = 'bdk-jvm-debug'
+            version = '0.2.1-dev'
+
+            from components.java
+        }
+    }
+}

jvm/src/test/java/org/bitcoindevkit/bdkjni/LibTest.kt

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+package org.bitcoindevkit.bdkjni
+
+import com.sun.jna.Native
+import com.sun.jna.NativeLong
+import org.junit.Test
+
+/**
+ * Library test, which will execute on linux host.
+ *
+ */
+class LibTest {
+
+    private val lib: Lib = Native.load("bdk_ffi", Lib::class.java)
+
+    @Test
+    fun print_string() {
+        lib.print_string("hello print string")
+    }
+
+    @Test
+    fun concat_print_free_string() {
+        val concat = lib.concat_string("hello", "concat")
+        lib.print_string(concat)
+        lib.free_string(concat)
+    }
+    
+    @Test
+    fun print_free_config() {
+        val config = Config_t()
+        config.name = "test"
+        config.count = NativeLong(101)
+        lib.print_config(config)
+        lib.free_config(config)
+    }
+
+    @Test
+    fun new_print_free_config() {
+        println("Long max value = ${Long.MAX_VALUE}")
+        val config = lib.new_config("test test", NativeLong(Long.MAX_VALUE))
+        lib.print_config(config)
+        lib.free_config(config)
+    }
+}