1 files changed, 47 insertions, 0 deletions
diff --git a/internal/hexaicli/run_editor_behavior_test.go b/internal/hexaicli/run_editor_behavior_test.go
new file mode 100644
index 0000000..a934473
--- /dev/null
+++ b/internal/hexaicli/run_editor_behavior_test.go
@@ -0,0 +1,47 @@
+package hexaicli
+
+import (
+	"bytes"
+	"context"
+	"strings"
+	"testing"
+
+	"codeberg.org/snonux/hexai/internal/appconfig"
+	"codeberg.org/snonux/hexai/internal/editor"
+	"codeberg.org/snonux/hexai/internal/llm"
+)
+
+// fake client that returns a fixed response
+type okClient struct{}
+
+func (okClient) Chat(_ context.Context, _ []llm.Message, _ ...llm.RequestOption) (string, error) {
+	return "OK", nil
+}
+func (okClient) Name() string         { return "prov" }
+func (okClient) DefaultModel() string { return "m" }
+
+// Ensure that when stdin has content and args are empty, Run does not open the editor.
+func TestRun_DoesNotOpenEditorWhenStdinPresent(t *testing.T) {
+	// Guard: make editor invocation fatal if called
+	oldRunEd := editor.RunEditor
+	defer func() { editor.RunEditor = oldRunEd }()
+	editor.RunEditor = func(_ string, _ string) error {
+		t.Fatalf("editor should not be invoked when stdin has content")
+		return nil
+	}
+
+	// Stub client constructor to avoid hitting real providers
+	oldNew := newClientFromApp
+	defer func() { newClientFromApp = oldNew }()
+	newClientFromApp = func(_ appconfig.App) (llm.Client, error) { return okClient{}, nil }
+
+	var out, errb bytes.Buffer
+	restore, f := setStdin(t, "from-stdin")
+	defer restore()
+	if err := Run(context.Background(), nil, f, &out, &errb); err != nil {
+		t.Fatalf("Run: %v", err)
+	}
+	if !strings.Contains(out.String(), "OK") {
+		t.Fatalf("expected OK output, got %q", out.String())
+	}
+}