1 files changed, 44 insertions, 0 deletions
diff --git a/examples/scala-js/sbt-plugin/src/test/scala/scala/scalajs/sbtplugin/test/env/JSEnvTest.scala b/examples/scala-js/sbt-plugin/src/test/scala/scala/scalajs/sbtplugin/test/env/JSEnvTest.scala
new file mode 100644
index 0000000..2a44c80
--- /dev/null
+++ b/examples/scala-js/sbt-plugin/src/test/scala/scala/scalajs/sbtplugin/test/env/JSEnvTest.scala
@@ -0,0 +1,44 @@
+package scala.scalajs.sbtplugin.test.env
+
+import scala.scalajs.tools.env.JSEnv
+import scala.scalajs.tools.io.MemVirtualJSFile
+import scala.scalajs.tools.classpath.PartialClasspath
+import scala.scalajs.tools.logging.NullLogger
+import scala.scalajs.tools.env.NullJSConsole
+
+import org.junit.Assert._
+
+abstract class JSEnvTest {
+
+  protected def newJSEnv: JSEnv
+
+  implicit class RunMatcher(codeStr: String) {
+
+    val emptyCP = PartialClasspath.empty.resolve()
+    val code    = new MemVirtualJSFile("testScript.js").withContent(codeStr)
+
+    def hasOutput(expectedOut: String): Unit = {
+
+      val console = new StoreJSConsole()
+      val logger  = new StoreLogger()
+
+      newJSEnv.jsRunner(emptyCP, code, logger, console).run()
+
+      val log = logger.getLog
+
+      assertTrue("VM shouldn't produce log. Log:\n" +
+          log.mkString("\n"), log.isEmpty)
+      assertEquals("Output should match", expectedOut, console.getLog)
+    }
+
+    def fails(): Unit = {
+      try {
+        newJSEnv.jsRunner(emptyCP, code, NullLogger, NullJSConsole).run()
+        assertTrue("Code snipped should fail", false)
+      } catch {
+        case e: Exception =>
+      }
+    }
+  }
+
+}