test: refactor tests for a leaner test setup

internal/miro/testhelpers_test.go

@@ -0,0 +1,80 @@
+package miro
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"miro/internal/testutil"
+)
+
+func assertRecordShell(t *testing.T, path string) {
+	t.Helper()
+
+	info, err := os.Stat(path)
+	if err != nil {
+		t.Fatalf("Stat(%q) error = %v", path, err)
+	}
+	if info.Mode().Perm()&0o111 == 0 {
+		t.Fatalf("%q mode = %o, want executable", path, info.Mode().Perm())
+	}
+
+	if got := testutil.ReadFile(t, path); got != buildRecordShellScript() {
+		t.Fatalf("shell = %q, want generated recorder shell", got)
+	}
+}
+
+func withRecordStreams[T any](t *testing.T, input string, fn func(recordIO) T) T {
+	t.Helper()
+
+	path := filepath.Join(t.TempDir(), "stdin.txt")
+	testutil.WriteFile(t, path, input)
+
+	file, err := os.Open(path)
+	if err != nil {
+		t.Fatalf("Open(%q) error = %v", path, err)
+	}
+
+	t.Cleanup(func() {
+		if err := file.Close(); err != nil {
+			t.Fatalf("close record input: %v", err)
+		}
+	})
+
+	return fn(recordIO{
+		in:  file,
+		out: ioDiscard{},
+		err: &bytes.Buffer{},
+	})
+}
+
+type ioDiscard struct{}
+
+func (ioDiscard) Write(p []byte) (int, error) {
+	return len(p), nil
+}
+
+func mustWriteRecordShell(t *testing.T, testDir string) {
+	t.Helper()
+
+	if err := writeRecordShell(testDir); err != nil {
+		t.Fatalf("writeRecordShell(%q) error = %v", testDir, err)
+	}
+}
+
+func defaultSandboxConfig() map[string]string {
+	return map[string]string{
+		"visible_home": "/home/test",
+	}
+}
+
+func containsEnvEntry(env []string, want string) bool {
+	for _, entry := range env {
+		if entry == want {
+			return true
+		}
+	}
+
+	return false
+}