1 files changed, 61 insertions, 0 deletions
diff --git a/test/test/InterfaceEntryPointTest.scala b/test/test/InterfaceEntryPointTest.scala
new file mode 100644
index 000000000..b193b5f64
--- /dev/null
+++ b/test/test/InterfaceEntryPointTest.scala
@@ -0,0 +1,61 @@
+package test
+
+import org.junit.Test
+import org.junit.Assert._
+import dotty.tools.dotc.interfaces._
+import scala.collection.mutable.ListBuffer
+
+/** Test that demonstrates how to use dotty-interfaces
+ *
+ *  This test requires:
+ *  - dotty-interfaces to be present at compile-time
+ *  - dotty-interfaces and dotty to be present at run-time
+ *
+ *  Since the ABI of dotty-interfaces is stable, this means that users can write
+ *  code that works with multiple versions of dotty without recompilation.
+ *
+ *  @see [[OtherEntryPointsTest]]
+ */
+class InterfaceEntryPointTest {
+  @Test def runCompilerFromInterface = {
+    val sources = List("./tests/pos/HelloWorld.scala")
+    val args = sources ++ List("-d", "./out/")
+
+    val mainClass = Class.forName("dotty.tools.dotc.Main")
+    val process = mainClass.getMethod("process",
+      classOf[Array[String]], classOf[SimpleReporter], classOf[CompilerCallback])
+
+    val reporter = new CustomSimpleReporter
+    val callback = new CustomCompilerCallback
+
+    // Run the compiler by calling dotty.tools.dotc.Main.process
+    process.invoke(null, args.toArray, reporter, callback)
+
+    assertEquals("Number of errors", 0, reporter.errorCount)
+    assertEquals("Number of warnings", 0, reporter.warningCount)
+    assertEquals("Compiled sources", sources, callback.paths)
+  }
+
+  private class CustomSimpleReporter extends SimpleReporter {
+    var errorCount = 0
+    var warningCount = 0
+
+    def report(diag: Diagnostic): Unit = {
+      if (diag.level == Diagnostic.ERROR)
+        errorCount += 1
+      if (diag.level == Diagnostic.WARNING)
+        warningCount += 1
+    }
+  }
+
+  private class CustomCompilerCallback extends CompilerCallback {
+    private val pathsBuffer = new ListBuffer[String]
+    def paths = pathsBuffer.toList
+
+    override def onSourceCompiled(source: SourceFile): Unit = {
+      if (source.jfile.isPresent)
+        pathsBuffer += source.jfile.get.getPath
+    }
+  }
+}
+