gradle-plugin: Add a test for default values

tools/kotlin-native-gradle-plugin/src/test/groovy/org/jetbrains/kotlin/gradle/plugin/test/DefaultSpecification.groovy

@@ -0,0 +1,28 @@
+package org.jetbrains.kotlin.gradle.plugin.test
+
+import org.gradle.testkit.runner.TaskOutcome
+import org.junit.Rule
+import org.junit.rules.TemporaryFolder
+import spock.lang.Specification
+
+
+class DefaultSpecification extends Specification {
+
+    @Rule
+    TemporaryFolder tmpFolder = new TemporaryFolder()
+
+    def 'Plugin should build a project without additional settings'() {
+        when:
+        def project = KonanInteropProject.create(tmpFolder) { KonanInteropProject it ->
+            it.buildFile.write("""
+            plugins { id 'konan' }
+            konanInterop { stdio {} }
+            konanArtifacts { main {} }
+            """.stripIndent())
+        }
+        def result = project.createRunner().withArguments('build').build()
+
+        then:
+        !result.tasks.collect { it.outcome }.contains(TaskOutcome.FAILED)
+    }
+}