From d0d14b87e155ee6a4e2fef3bdb04cb5548b22bc4 Mon Sep 17 00:00:00 2001
From: Dor-bl <59066376+Dor-bl@users.noreply.github.com>
Date: Mon, 19 Oct 2026 04:41:24 +0000
Subject: [PATCH 1/4] test: add unit tests for format_stacktrace

Add unit tests for `format_stacktrace` in `test/unit/webdriver/errorhandler_test.py` covering empty inputs, string stack traces, sequence of frame dicts with optional keys, non-dict elements, and non-iterable inputs.
---
 test/unit/webdriver/errorhandler_test.py | 67 ++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 test/unit/webdriver/errorhandler_test.py

diff --git a/test/unit/webdriver/errorhandler_test.py b/test/unit/webdriver/errorhandler_test.py
new file mode 100644
index 00000000..f5220156
--- /dev/null
+++ b/test/unit/webdriver/errorhandler_test.py
@@ -0,0 +1,67 @@
+import pytest
+
+from appium.webdriver.errorhandler import format_stacktrace
+
+
+class TestFormatStacktrace:
+    @pytest.mark.parametrize(
+        ('input_data', 'expected'),
+        [
+            (None, []),
+            ('', []),
+            ([], []),
+            ({}, []),
+        ],
+    )
+    def test_format_stacktrace_empty(self, input_data: None | str | list | dict, expected: list[str]) -> None:
+        assert format_stacktrace(input_data) == expected
+
+    def test_format_stacktrace_string(self) -> None:
+        stack = 'Error: Something went wrong\n    at foo (file.js:10)\n    at bar (file.js:20)'
+        expected = [
+            'Error: Something went wrong',
+            '    at foo (file.js:10)',
+            '    at bar (file.js:20)',
+        ]
+        assert format_stacktrace(stack) == expected
+
+    def test_format_stacktrace_sequence_dicts(self) -> None:
+        frames = [
+            {
+                'lineNumber': 42,
+                'fileName': 'index.js',
+                'methodName': 'handleClick',
+                'className': 'MyComponent',
+            },
+            {
+                'fileName': 'utils.js',
+                'methodName': 'helper',
+            },
+            {},
+        ]
+        expected = [
+            '    at MyComponent.handleClick (index.js:42)',
+            '    at helper (utils.js)',
+            '    at <anonymous> (<anonymous>)',
+        ]
+        assert format_stacktrace(frames) == expected
+
+    def test_format_stacktrace_sequence_with_non_dict_elements(self) -> None:
+        frames = [
+            'not a dict',
+            123,
+            None,
+            {
+                'lineNumber': 5,
+                'fileName': 'main.py',
+                'methodName': 'run',
+            },
+        ]
+        expected = [
+            '    at run (main.py:5)',
+        ]
+        assert format_stacktrace(frames) == expected
+
+    def test_format_stacktrace_non_iterable_type_error(self) -> None:
+        assert format_stacktrace(123) == []
+        assert format_stacktrace(True) == []

From 2b852b2260fbbd6293262b729e30c67904970559 Mon Sep 17 00:00:00 2001
From: Dor-bl <59066376+Dor-bl@users.noreply.github.com>
Date: Mon, 19 Oct 2026 05:15:51 +0000
Subject: [PATCH 2/4] test: add unit tests for format_stacktrace

Add unit tests for `format_stacktrace` in `test/unit/webdriver/errorhandler_test.py` covering empty inputs, string stack traces, sequence of frame dicts with optional keys, non-dict elements, and non-iterable inputs.

From c16ec020ca428fd47c9caa69c68f12ccdf353cf2 Mon Sep 17 00:00:00 2001
From: Dor-bl <59066376+Dor-bl@users.noreply.github.com>
Date: Mon, 19 Oct 2026 05:51:42 +0000
Subject: [PATCH 3/4] test: add unit tests for format_stacktrace

Add unit tests for `format_stacktrace` in `test/unit/webdriver/errorhandler_test.py` covering empty inputs, string stack traces, sequence of frame dicts with optional keys, non-dict elements, and non-iterable inputs.

From 166bd904932b6f2f060eb9ef4cf8462a47952903 Mon Sep 17 00:00:00 2001
From: Dor-bl <59066376+Dor-bl@users.noreply.github.com>
Date: Mon, 19 Oct 2026 06:42:59 +0000
Subject: [PATCH 4/4] test: add unit tests for format_stacktrace

Add unit tests for `format_stacktrace` in `test/unit/webdriver/errorhandler_test.py` covering empty inputs, string stack traces, sequence of frame dicts with optional keys, non-dict elements, and non-iterable inputs.