diff --git a/examples/embedding/lib/REPL-startup.py b/examples/embedding/lib/REPL-startup.py
index 6b27c415..4c84fb03 100644
--- a/examples/embedding/lib/REPL-startup.py
+++ b/examples/embedding/lib/REPL-startup.py
@@ -1,4 +1,6 @@
-
+# Copyright 2022 The go-python Authors.  All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
 
 # This file is called from main.go when in REPL mode		
 
diff --git a/examples/embedding/lib/mylib.py b/examples/embedding/lib/mylib.py
index dd5af499..b0105e7d 100644
--- a/examples/embedding/lib/mylib.py
+++ b/examples/embedding/lib/mylib.py
@@ -1,3 +1,7 @@
+# Copyright 2022 The go-python Authors.  All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
 import mylib_go as _go
 
 PY_VERSION  = _go.PY_VERSION
@@ -47,5 +51,3 @@ def PrintItinerary(self):
             i += 1
             
         print("###  Made with %s " % self._libVers)
-
-        
\ No newline at end of file
diff --git a/examples/embedding/main_test.go b/examples/embedding/main_test.go
index e5287be8..642867ec 100644
--- a/examples/embedding/main_test.go
+++ b/examples/embedding/main_test.go
@@ -1,3 +1,7 @@
+// Copyright 2022 The go-python Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package main
 
 import (
@@ -9,8 +13,6 @@ import (
 	"testing"
 )
 
-const embeddingTestOutput = "testdata/embedding_out_golden.txt"
-
 var regen = flag.Bool("regen", false, "regenerate golden files")
 
 func TestEmbeddedExample(t *testing.T) {
@@ -25,33 +27,36 @@ func TestEmbeddedExample(t *testing.T) {
 	cmd := exec.Command("go", "build", "-o", exe, ".")
 	err = cmd.Run()
 	if err != nil {
-		t.Fatalf("failed to compile embedding example: %v", err)
+		t.Fatalf("failed to compile embedding example: %+v", err)
 	}
 
 	out := new(bytes.Buffer)
 	cmd = exec.Command(exe, "mylib-demo.py")
 	cmd.Stdout = out
+	cmd.Stderr = out
 
 	err = cmd.Run()
 	if err != nil {
-		t.Fatalf("failed to run embedding binary: %v", err)
+		t.Fatalf("failed to run embedding binary: %+v", err)
 	}
 
-	testOutput := out.Bytes()
+	const fname = "testdata/embedding_out_golden.txt"
+
+	got := out.Bytes()
 
 	flag.Parse()
 	if *regen {
-		err = os.WriteFile(embeddingTestOutput, testOutput, 0644)
+		err = os.WriteFile(fname, got, 0644)
 		if err != nil {
-			t.Fatalf("failed to write test output: %v", err)
+			t.Fatalf("could not write golden file: %+v", err)
 		}
 	}
 
-	mustMatch, err := os.ReadFile(embeddingTestOutput)
+	want, err := os.ReadFile(fname)
 	if err != nil {
-		t.Fatalf("failed read %q", embeddingTestOutput)
+		t.Fatalf("could not read golden file: %+v", err)
 	}
-	if !bytes.Equal(testOutput, mustMatch) {
-		t.Fatalf("embedded test output did not match accepted output from %q", embeddingTestOutput)
+	if !bytes.Equal(got, want) {
+		t.Fatalf("stdout differ:\ngot:\n%s\nwant:\n%s\n", got, want)
 	}
 }
diff --git a/examples/embedding/mylib-demo.py b/examples/embedding/mylib-demo.py
index 4a461023..1785c307 100644
--- a/examples/embedding/mylib-demo.py
+++ b/examples/embedding/mylib-demo.py
@@ -1,3 +1,7 @@
+# Copyright 2022 The go-python Authors.  All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
 print('''
 Welcome to a gpython embedded example, 
     where your wildest Go-based python dreams come true!''')
diff --git a/examples/multi-context/main.go b/examples/multi-context/main.go
index e9f72212..7559d60e 100644
--- a/examples/multi-context/main.go
+++ b/examples/multi-context/main.go
@@ -36,7 +36,6 @@ func main() {
 		// Give each trial a fresh start
 		runtime.GC()
 	}
-
 }
 
 var jobScript = `
diff --git a/main.go b/main.go
index 5aca0dc1..77fe4927 100644
--- a/main.go
+++ b/main.go
@@ -41,10 +41,12 @@ Full options:
 func main() {
 	flag.Usage = syntaxError
 	flag.Parse()
-	args := flag.Args()
+	xmain(flag.Args())
+}
 
+func xmain(args []string) {
 	opts := py.DefaultContextOpts()
-	opts.SysArgs = flag.Args()
+	opts.SysArgs = args
 	ctx := py.NewContext(opts)
 
 	if *cpuprofile != "" {
@@ -77,5 +79,4 @@ func main() {
 			log.Fatal(err)
 		}
 	}
-
 }
diff --git a/main_test.go b/main_test.go
new file mode 100644
index 00000000..e41ed869
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,61 @@
+// Copyright 2022 The go-python Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"bytes"
+	"flag"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"testing"
+)
+
+var regen = flag.Bool("regen", false, "regenerate golden files")
+
+func TestGPython(t *testing.T) {
+
+	tmp, err := os.MkdirTemp("", "go-python-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmp)
+
+	exe := filepath.Join(tmp, "out.exe")
+	cmd := exec.Command("go", "build", "-o", exe, ".")
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err = cmd.Run()
+	if err != nil {
+		t.Fatalf("failed to compile embedding example: %+v", err)
+	}
+
+	got, err := exec.Command(exe, "testdata/hello.py").CombinedOutput()
+	if err != nil {
+		t.Fatalf("could not run gpython:\n%s\nerr: %+v", got, err)
+	}
+
+	const fname = "testdata/hello_golden.txt"
+
+	flag.Parse()
+	if *regen {
+		err = os.WriteFile(fname, got, 0644)
+		if err != nil {
+			t.Fatalf("could not write golden file: %+v", err)
+		}
+	}
+
+	want, err := os.ReadFile(fname)
+	if err != nil {
+		t.Fatalf("could not read golden file: %+v", err)
+	}
+	if !bytes.Equal(got, want) {
+		t.Fatalf("stdout differ:\ngot:\n%s\nwant:\n%s\n", got, want)
+	}
+}
+
+func TestRunFile(t *testing.T) {
+	xmain([]string{"./testdata/hello.py"})
+}
diff --git a/testdata/hello.py b/testdata/hello.py
new file mode 100644
index 00000000..e94acca7
--- /dev/null
+++ b/testdata/hello.py
@@ -0,0 +1 @@
+print("hello, world!")
diff --git a/testdata/hello_golden.txt b/testdata/hello_golden.txt
new file mode 100644
index 00000000..270c611e
--- /dev/null
+++ b/testdata/hello_golden.txt
@@ -0,0 +1 @@
+hello, world!