chore: import upstream snapshot with attribution

tests/test_encoding.py

@@ -0,0 +1,78 @@
+"""Encoding stress tests for code_analyzer and scraper modules.
+
+Tests that the system gracefully handles non-standard encodings,
+byte order marks, mixed newlines, and binary files.
+"""
+
+from skill_seekers.cli.code_analyzer import CodeAnalyzer
+
+
+class TestEncodingEdgeCases:
+    def setup_method(self):
+        self.analyzer = CodeAnalyzer(depth="deep")
+
+    def test_utf8_bom_file(self):
+        content = "\ufeff# -*- coding: utf-8 -*-\ndef hello():\n    return 'world'\n"
+        result = self.analyzer.analyze_file("test.py", content, "Python")
+        if result:
+            assert "functions" in result
+            funcs = result.get("functions", [])
+            if funcs:
+                assert any(f["name"] == "hello" for f in funcs)
+
+    def test_latin1_escaped(self):
+        content = "# coding: latin-1\ndef greet():\n    return 'héllo'\n"
+        result = self.analyzer.analyze_file("test.py", content, "Python")
+        if result:
+            assert "functions" in result
+
+    def test_crlf_newlines(self):
+        content = "class Foo:\r\n    def bar(self):\r\n        return 1\r\n"
+        result = self.analyzer.analyze_file("test.py", content, "Python")
+        if result:
+            assert "classes" in result
+
+    def test_mixed_newlines(self):
+        content = "class Foo:\r\n    def bar(self):\r        return 1\n"
+        result = self.analyzer.analyze_file("test.py", content, "Python")
+        if result:
+            assert "classes" in result
+
+    def test_binary_file_skipped(self):
+        content = "\x00\x01\x02\x03\x04binary content\x00\x00"
+        result = self.analyzer.analyze_file("test.bin", content, "Python")
+        assert result is None or isinstance(result, dict)
+
+    def test_null_bytes_in_code(self):
+        content = "def valid():\n    return None\n\ndef also_valid():\n    pass\n"
+        result = self.analyzer.analyze_file("test.py", content, "Python")
+        if result:
+            assert "functions" in result
+
+    def test_tabs_as_indentation(self):
+        content = "def tabbed():\n\tx = 1\n\ty = 2\n\treturn x + y\n"
+        result = self.analyzer.analyze_file("test.py", content, "Python")
+        if result:
+            assert "functions" in result
+
+    def test_very_long_identifier(self):
+        long_name = "a" * 100
+        content = f"def {long_name}():\n    pass\n"
+        result = self.analyzer.analyze_file("test.py", content, "Python")
+        if result:
+            assert "functions" in result
+
+    def test_single_long_line(self):
+        """Single very long line should not crash."""
+        content = "x = " + '"' + "a" * 5000 + '"\n'
+        result = self.analyzer.analyze_file("test.py", content, "Python")
+        assert result is None or isinstance(result, dict)
+
+    def test_deeply_nested_code(self):
+        """Deeply nested structures should not hit recursion limits."""
+        nested = "def outer():\n"
+        for i in range(50):
+            nested += f"    def inner_{i}():\n"
+        nested += "        pass\n"
+        result = self.analyzer.analyze_file("test.py", nested, "Python")
+        assert isinstance(result, dict)