test: add unit tests for errorhandler format_stacktrace

test/unit/webdriver/errorhandler_test.py

@@ -0,0 +1,87 @@
+#!/usr/bin/env python
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+from appium.webdriver.errorhandler import format_stacktrace
+
+
+@pytest.mark.parametrize('falsy_input', [None, '', [], ()])
+def test_format_stacktrace_falsy_input(falsy_input: None | str | tuple | list) -> None:
+    assert format_stacktrace(falsy_input) == []
+
+
+def test_format_stacktrace_single_line_str() -> None:
+    assert format_stacktrace('Error: something failed') == ['Error: something failed']
+
+
+def test_format_stacktrace_multi_line_str() -> None:
+    trace = 'Error: something failed\n  at func1 (file1.js:10)\n  at func2 (file2.js:20)'
+    expected = ['Error: something failed', '  at func1 (file1.js:10)', '  at func2 (file2.js:20)']
+    assert format_stacktrace(trace) == expected
+
+
+def test_format_stacktrace_sequence_full_frame() -> None:
+    frames = [
+        {
+            'className': 'com.example.MyClass',
+            'methodName': 'myMethod',
+            'fileName': 'MyClass.java',
+            'lineNumber': 42,
+        }
+    ]
+    assert format_stacktrace(frames) == ['    at com.example.MyClass.myMethod (MyClass.java:42)']
+
+
+def test_format_stacktrace_sequence_missing_optional_fields() -> None:
+    frames = [
+        # Missing className and lineNumber
+        {
+            'methodName': 'onClick',
+            'fileName': 'app.js',
+        },
+        # Missing fileName and methodName, with className
+        {
+            'className': 'MyComponent',
+            'lineNumber': 10,
+        },
+        # Missing all optional fields
+        {},
+    ]
+    expected = [
+        '    at onClick (app.js)',
+        '    at MyComponent.<anonymous> (<anonymous>:10)',
+        '    at <anonymous> (<anonymous>)',
+    ]
+    assert format_stacktrace(frames) == expected
+
+
+def test_format_stacktrace_sequence_non_dict_elements() -> None:
+    frames = [
+        {'methodName': 'validFunc', 'fileName': 'valid.js', 'lineNumber': 5},
+        'invalid_string_frame',
+        123,
+        None,
+        {'methodName': 'anotherValidFunc', 'fileName': 'valid.js', 'lineNumber': 15},
+    ]
+    expected = [
+        '    at validFunc (valid.js:5)',
+        '    at anotherValidFunc (valid.js:15)',
+    ]
+    assert format_stacktrace(frames) == expected
+
+
+def test_format_stacktrace_type_error_handling() -> None:
+    # Non-iterable type passed as sequence (bypassing static typing)
+    assert format_stacktrace(12345) == []  # type: ignore[arg-type]