examples/embedding: use new pytest testing scaffolding

Co-authored-by: Drew O'Meara <[email protected]>
Signed-off-by: Sebastien Binet <[email protected]>

examples/embedding/README.md

@@ -35,21 +35,21 @@ modules that are only available in CPython.
 
 ### Packing List
 
-|                       |                                                                   |
-|---------------------- | ------------------------------------------------------------------|
-| `main.go`             | if no args, runs in REPL mode, otherwise runs the given file      |
-| `lib/mylib.py`        | models a library that your application would expose for users     |
-| `lib/REPL-startup.py` | invoked by `main.go` when starting REPL mode                      |
-| `mylib-demo.py`       | models a user-authored script that consumes `mylib`               |
-| `mylib.module.go`     | Go implementation of `mylib_go` consumed by `mylib`               |
+|                          |                                                                   |
+|------------------------- | ------------------------------------------------------------------|
+| `main.go`                | if no args, runs in REPL mode, otherwise runs the given file      |
+| `lib/mylib.py`           | models a library that your application would expose for users     |
+| `lib/REPL-startup.py`    | invoked by `main.go` when starting REPL mode                      |
+| `testdata/mylib-demo.py` | models a user-authored script that consumes `mylib`               |
+| `mylib.module.go`        | Go implementation of `mylib_go` consumed by `mylib`               |
 
 
 ### Invoking a Python Script
 
 ```bash
 $ cd examples/embedding/
 $ go build .
-$ ./embedding mylib-demo.py
+$ ./embedding ./testdata/mylib-demo.py
 ```
 ```
 Welcome to a gpython embedded example, 

examples/embedding/main_test.go

@@ -5,58 +5,11 @@
 package main
 
 import (
-	"bytes"
-	"flag"
-	"os"
-	"os/exec"
-	"path/filepath"
 	"testing"
-)
 
-var regen = flag.Bool("regen", false, "regenerate golden files")
+	"github.com/go-python/gpython/pytest"
+)
 
 func TestEmbeddedExample(t *testing.T) {
-
-	tmp, err := os.MkdirTemp("", "go-python-embedding-")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(tmp)
-
-	exe := filepath.Join(tmp, "out.exe")
-	cmd := exec.Command("go", "build", "-o", exe, ".")
-	err = cmd.Run()
-	if err != nil {
-		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)
-	}
-
-	const fname = "testdata/embedding_out_golden.txt"
-
-	got := out.Bytes()
-
-	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)
-	}
+	pytest.RunScript(t, "./testdata/mylib-demo.py")
 }

examples/embedding/mylib.module.go

@@ -48,7 +48,7 @@ func init() {
 			"MYLIB_VERS": py.String("Vacation 1.0 by Fletch F. Fletcher"),
 		},
 		OnContextClosed: func(instance *py.Module) {
-			fmt.Print("<<< host py.Context of py.Module instance closing >>>\n+++\n")
+			py.Println(instance, "<<< host py.Context of py.Module instance closing >>>\n+++")
 		},
 	})
 }