Added test case validating LambdaTest works

See com-lihaoyi#553

contrib/testng/test/resources/demo/test/src/lambdatest/SimpleLambdaTest.java

@@ -0,0 +1,50 @@
+package lambdatest;
+
+import static de.tobiasroeser.lambdatest.Expect.*;
+
+import org.testng.annotations.*;
+import de.tobiasroeser.lambdatest.testng.FreeSpec;
+
+
+/**
+ * Test case taken from https://github.com/lefou/LambdaTest#writing-tests-with-lambda-test
+ */
+public class SimpleLambdaTest extends FreeSpec {
+  public SimpleLambdaTest() {
+
+    test("1 + 1 = 2", () -> {
+      expectEquals(1 + 1, 2);
+    });
+
+    test("a pending test", () -> pending());
+
+    test("divide by zero", () -> {
+      int a = 2;
+      int b = 0;
+      intercept(ArithmeticException.class, () -> {
+        int c = a / b;
+      });
+    });
+
+    section("A String should", () -> {
+      final String aString = "A string";
+
+      test("match certain criteria", () -> {
+        expectString(aString)
+          .contains("string")
+          .containsIgnoreCase("String")
+          .startsWith("A")
+          .endsWith("ng")
+          .hasLength(8);
+      });
+
+      test("be not longer than 2", () -> {
+        expectString(aString).isLongerThan(2);
+      });
+    });
+
+    test("demo of a fail", () -> {
+      "yes".equals("yes and no");
+    });
+  }
+}

contrib/testng/test/src/mill/testng/TestNGTests.scala

@@ -23,7 +23,9 @@ object TestNGTests extends TestSuite {
       override def runClasspath: Target[Seq[PathRef]] = T{super.runClasspath() ++ testngClasspath()}
       override def ivyDeps = T{
         super.ivyDeps() ++
-          Agg(ivy"org.testng:testng:6.11",
+          Agg(
+            ivy"org.testng:testng:6.11",
+            ivy"de.tototec:de.tobiasroeser.lambdatest:0.7.0"
           )
       }
       def testFrameworks = T {
@@ -54,14 +56,13 @@ object TestNGTests extends TestSuite {
           result == Seq("mill.testng.TestNGFramework"),
           evalCount > 0
         )
-        val evalRes = eval.apply(demo.test.test())
-        evalRes match {
-          case Left(Exception(ex, outerStack)) =>
-            println(outerStack.value.mkString("\t", "\n\t\t", ""))
-            println(ex.getMessage)
-            ex.printStackTrace()
-          case _ => ()
-        }
+      }
+      "Test case lookup from inherited annotations" - workspaceTest(demo) { eval =>
+        val Right((result, evalCount)) = eval.apply(demo.test.test())
+        val tres = result.asInstanceOf[(String, Seq[mill.scalalib.TestRunner.Result])]
+        assert(
+          tres._2.size == 8
+        )
       }
     }
   }