WIP Add tests: CLI interface of export.Service

tests/export/test_service.py

@@ -1,6 +1,7 @@
 import unittest
-from unittest.mock import patch
+from unittest.mock import MagicMock, patch
 
+import pytest
 from PyQt5.QtTest import QSignalSpy
 
 from securedrop_client import export
@@ -60,4 +61,39 @@ def test_emits_printer_not_found_ready_when_printer_status_check_fails(
         assert len(printer_not_found_ready_emissions) == 1
         assert printer_not_found_ready_emissions[0] == [expected_error]
 
-    # FIXME Add disk API tests
+
+class TestExportServiceInterfaceWithCLI(unittest.TestCase):
+    def test_internal_printer_status_check_returns_without_errors_when_empty_response(self):
+        SUCCESS_STATUS = ""  # sd-devices API
+        export_service = export.Service()
+        valid_archive_path = "archive_path_13kn3"
+        export_service._create_archive = MagicMock()
+        export_service._export_archive = MagicMock(return_value=SUCCESS_STATUS)
+
+        export_service._check_printer_status(valid_archive_path)  # testing internal details
+
+        assert True  # no exception was raised
+
+    def test_internal_printer_status_check_exports_a_specifically_created_archive(self):
+        expected_archive_path = "archive_path_9f483f"
+        expected_archive_dir = "archive_dir_2i19c"
+        export_service = export.Service()
+        export_service._create_archive = MagicMock(return_value=expected_archive_path)
+        export_service._export_archive = MagicMock(return_value="")  # "magic" value
+
+        export_service._check_printer_status(expected_archive_dir)  # testing internal details
+
+        export_service._export_archive.assert_called_once_with(expected_archive_path)
+        export_service._create_archive.assert_called_once_with(
+            expected_archive_dir, "printer-preflight.sd-export", {"device": "printer-preflight"}
+        )
+
+    def test_internal_printer_status_check_raises_export_error_when_not_USB_CONNECTED(self):
+        not_USB_CONNECTED = "whatever"
+        valid_archive_path = "archive_path_034d3"
+        export_service = export.Service()
+        export_service._create_archive = MagicMock()
+        export_service._export_archive = MagicMock(return_value=not_USB_CONNECTED)
+
+        with pytest.raises(export.ExportError):
+            export_service._check_printer_status(valid_archive_path)  # testing internal details