Use k6 return code to check test result

Signed-off-by: Pablo Chacin <pablochacin@gmail.com>

modules/k6/examples_test.go

@@ -2,6 +2,7 @@ package k6_test
 
 import (
 	"context"
+	"fmt"
 	"path/filepath"
 
 	"github.com/testcontainers/testcontainers-go/modules/k6"
@@ -11,7 +12,7 @@ func ExampleRunContainer() {
 	// runK6Container {
 	ctx := context.Background()
 
-	absPath, err := filepath.Abs("./scripts/test.js")
+	absPath, err := filepath.Abs("./scripts/pass.js")
 	if err != nil {
 		panic(err)
 	}
@@ -26,5 +27,14 @@ func ExampleRunContainer() {
 			panic(err)
 		}
 	}()
+
+	// assert the result of the test
+	state, err := container.State(ctx)
+	if err != nil {
+		panic(err)
+	}
+	if state.ExitCode != 0 {
+		panic(fmt.Errorf("test failed with exit code %d", state.ExitCode))
+	}
 	// }
 }