Ensure coverage of Xcode run command.

tests/platforms/macOS/xcode/test_run.py

@@ -1 +1,36 @@
-# skip since run uses the same code as app command
+# Xcode uses the same run implementation as the base app;
+# Run a basic test to ensure coverage, but fall back to
+# the app backend for exhaustive tests.
+from unittest import mock
+
+from briefcase.platforms.macOS.xcode import macOSXcodeRunCommand
+
+
+def test_run_app(first_app_config, tmp_path):
+    "A macOS Xcode app can be started"
+    command = macOSXcodeRunCommand(base_path=tmp_path)
+    command.subprocess = mock.MagicMock()
+
+    command.run_app(first_app_config)
+
+    # Calls were made to start the app and to start a log stream.
+    bin_path = command.binary_path(first_app_config)
+    command.subprocess.run.assert_has_calls([
+        mock.call(
+            ['open', '-n', str(bin_path)],
+            check=True
+        ),
+        mock.call(
+            [
+                'log', 'stream',
+                '--style', 'compact',
+                '--predicate',
+                'senderImagePath=="{sender}"'
+                ' OR (processImagePath=="{sender}"'
+                ' AND senderImagePath=="/usr/lib/libffi.dylib")'.format(
+                    sender=bin_path / "Contents" / "MacOS" / "First App"
+                )
+            ],
+            check=True,
+        )
+    ])