add a test for kotlinCompiler version setting

src/test/kotlin/com/beust/kobalt/internal/KotlinCompilerVersionTest.kt

@@ -0,0 +1,58 @@
+package com.beust.kobalt.internal
+
+import com.beust.kobalt.BaseTest
+import com.beust.kobalt.BuildFile
+import com.beust.kobalt.ProjectFile
+import com.beust.kobalt.ProjectInfo
+import com.beust.kobalt.misc.KFiles
+import org.assertj.core.api.Assertions.assertThat
+import org.testng.annotations.Test
+import java.io.File
+
+class KotlinCompilerVersionTest : BaseTest() {
+
+    @Test
+    fun shouldCompileWithExternalKotlin() {
+        val projectInfo = ProjectInfo(
+                BuildFile(
+                        listOf("com.beust.kobalt.plugin.packaging.*", "com.beust.kobalt.plugin.kotlin.kotlinCompiler"),
+                        """
+                            kotlinCompiler {
+                                version = "1.2.60"
+                                args("-jvm-target", "1.8")
+                            }
+                            assemble{ jar{} }
+                            """
+                ),
+                listOf(
+                        ProjectFile("src/main/kotlin/A.kt", "val a = Bob()"),
+                        ProjectFile("src/main/kotlin/Bob.java", "class Bob {  }")
+                )
+        )
+
+        val result = launchProject(projectInfo, arrayOf("assemble"))
+
+        val project = result.projectDescription
+        val jarFile = File(KFiles.joinDir(project.file.absolutePath, "kobaltBuild/libs", project.name + "-"
+                + project.version + ".jar"))
+
+        assertThat(jarFile).exists()
+    }
+
+    @Test
+    fun shouldFailWhenKotlinVersionDoesNotExist() {
+        val projectInfo = ProjectInfo(
+                BuildFile(
+                        listOf("com.beust.kobalt.plugin.packaging.*", "com.beust.kobalt.plugin.kotlin.kotlinCompiler"),
+                        """
+                            kotlinCompiler { version = "1.1.20" }
+                            assemble{ jar{} }
+                            """
+                ),
+                listOf(ProjectFile("src/main/kotlin/A.kt", "val a = \"foo\"")))
+
+        val result = launchProject(projectInfo, arrayOf("assemble"))
+
+        assertThat(result).isEqualTo(1)
+    }
+}