test(06-01): add failing test for icon inclusion in .intunewin export

- test_intunewin_includes_icon: uploads PNG icon, asserts icon.png in staged files
- test_intunewin_without_icon_succeeds: baseline no-icon export passes (already green)

tests/test_packages.py

@@ -189,3 +189,58 @@ class TestCommandPreview:
         html = resp.text
         assert f"/printers/{printer.id}/icon" in html
         assert "icon-status" in html
+
+
+# ---------------------------------------------------------------------------
+# Icon inclusion in .intunewin export
+# ---------------------------------------------------------------------------
+
+
+class TestIntunewinIconInclusion:
+    def test_intunewin_includes_icon(self, client, setup_printer_with_driver, tmp_data_dir, monkeypatch):
+        """When a printer has an uploaded icon, icon.png must appear in the .intunewin staging directory."""
+        import io as _io
+        import os
+
+        from PIL import Image
+
+        printer, _ = setup_printer_with_driver
+
+        # Upload a 256x256 PNG icon for the printer
+        buf = _io.BytesIO()
+        Image.new("RGBA", (256, 256), color="red").save(buf, format="PNG")
+        buf.seek(0)
+        upload_resp = client.post(
+            f"/printers/{printer.id}/icon",
+            files={"file": ("icon.png", buf, "image/png")},
+        )
+        assert upload_resp.status_code == 200
+
+        # Monkeypatch build_intunewin to capture staged files and write a fake output
+        staged_files: list[str] = []
+
+        def fake_build(source_dir, setup_file, output_path):
+            staged_files.extend(os.listdir(source_dir))
+            with open(output_path, "wb") as f:
+                f.write(b"FAKE")
+
+        monkeypatch.setattr("imptune.api.packages.build_intunewin", fake_build)
+
+        resp = client.get(f"/printers/{printer.id}/packages/intunewin")
+        assert resp.status_code == 200
+        assert "icon.png" in staged_files
+
+    def test_intunewin_without_icon_succeeds(self, client, setup_printer_with_driver, monkeypatch):
+        """When a printer has no icon, .intunewin export must succeed without error."""
+        import os
+
+        # Monkeypatch build_intunewin to write a fake output
+        def fake_build(source_dir, setup_file, output_path):
+            with open(output_path, "wb") as f:
+                f.write(b"FAKE")
+
+        monkeypatch.setattr("imptune.api.packages.build_intunewin", fake_build)
+
+        printer, _ = setup_printer_with_driver
+        resp = client.get(f"/printers/{printer.id}/packages/intunewin")
+        assert resp.status_code == 200