Finished

Test Name	Status
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all	Fail
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	Fail
test_upper_and_lowercase_property	Fail
test_all_lowercase_property	Pass
test_empty_input	Pass
test_escaped_backslash_in_property_value_becomes_just_a_backslash	Pass
test_escaped_closing_bracket_within_property_value_becomes_just_a_closing_bracket	Pass
test_escaped_t_and_n_in_property_value_are_just_letters_not_whitespace	Pass
test_escaped_tab_in_property_value_is_converted_to_space	Pass
test_multiple_properties	Pass
test_multiple_property_values	Pass
test_node_without_properties	Pass
test_node_without_tree	Pass
test_opening_bracket_within_property_value_doesn_t_need_to_be_escaped	Pass
test_parentheses_in_property_value_don_t_need_to_be_escaped	Pass
test_properties_without_delimiter	Pass
test_semicolon_in_property_value_doesn_t_need_to_be_escaped	Pass
test_single_node_tree	Pass
test_tree_with_no_nodes	Pass
test_two_child_trees	Pass
test_two_nodes	Pass
test_within_property_values_newlines_remain_as_newlines	Pass
test_within_property_values_whitespace_characters_such_as_tab_are_converted_to_spaces	Pass

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sn62

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 def parse(input_string: str) -> SgfTree:
+    pass
+    """
+    Parse an SGF (Smart Game Format) string and return a tree structure of properties.
+    Args:
+        input_string: A string containing SGF formatted data
+    Returns:
+        SgfTree: A tree structure representing the SGF data
+    Raises:
+        ValueError: If the input is invalid according to SGF format rules
+    """
+    # Edge Case: Empty input or only whitespace
+    if not input_string or input_string.isspace():
+        raise ValueError("tree missing")
+    # Edge Case: Missing opening parenthesis
+    if not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Missing closing parenthesis
+    if not input_string.endswith(')'):
+        raise ValueError("tree missing")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    # Edge Case: Empty content after removing parentheses
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Missing semicolon after opening parenthesis
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    return _parse_tree_content(content)
+def _parse_tree_content(content: str) -> SgfTree:
+    """
+    Parse the content of a tree (without the outer parentheses).
+    Args:
+        content: The content of the tree, starting with ';'
+    Returns:
+        SgfTree: A tree structure representing the content
+    """
+    # Skip the initial semicolon
+    index = 1
+    # Parse properties of the current node
+    properties, index = _parse_properties(content, index)
+    # Parse children
+    children = []
+    while index < len(content):
+        char = content[index]
+        if char == '(':  # Start of a child tree
+            child_tree, consumed = _parse_subtree(content[index:])
+            children.append(child_tree)
+            index += consumed
+        else:
+            # If we encounter a semicolon, it's a shorthand for a single child
+            if char == ';':
+                # Parse the next node as a child
+                child_content = content[index:]
+                child_tree = _parse_tree_content(child_content)
+                children.append(child_tree)
+                break  # The rest is handled in the recursive call
+            else:
+                # Unexpected character
+                raise ValueError("tree missing")
+    return SgfTree(properties=properties, children=children)
+def _parse_subtree(content: str) -> tuple[SgfTree, int]:
+    """
+    Parse a subtree enclosed in parentheses.
+    Args:
+        content: String starting with '('
+    Returns:
+        tuple: (SgfTree, number of characters consumed)
+    """
+    if not content.startswith('('):
+        raise ValueError("tree missing")
+    # Find matching closing parenthesis
+    depth = 0
+    index = 0
+    for i, char in enumerate(content):
+        if char == '(':
+            depth += 1
+        elif char == ')':
+            depth -= 1
+            if depth == 0:
+                index = i
+                break
+    else:
+        # No matching closing parenthesis
+        raise ValueError("tree missing")
+    # Parse the content inside the parentheses
+    inner_content = content[1:index]
+    # Edge Case: Empty subtree
+    if not inner_content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Missing semicolon
+    if not inner_content.startswith(';'):
+        raise ValueError("tree missing")
+    tree = _parse_tree_content(inner_content)
+    return tree, index + 1
+def _parse_properties(content: str, start_index: int) -> tuple[dict, int]:
+    """
+    Parse properties from the content starting at start_index.
+    Args:
+        content: The string content to parse
+        start_index: The index to start parsing from
+    Returns:
+        tuple: (properties dictionary, next index to parse)
+    """
+    properties = {}
+    index = start_index
+    while index < len(content):
+        char = content[index]
+        # If we encounter a parenthesis or semicolon, we're done with properties
+        if char in '();':
+            break
+        # Parse property key
+        if not char.isalpha() or not char.isupper():
+            raise ValueError("property must be in uppercase")
+        key_start = index
+        while index < len(content) and content[index].isalpha() and content[index].isupper():
+            index += 1
+        key = content[key_start:index]
+        # Edge Case: Key with no values
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        # Parse values
+        values = []
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip opening bracket
+            value_start = index
+            # Parse value, handling escapes
+            while index < len(content) and content[index] != ']':
+                if content[index] == '\\':
+                    index += 2  # Skip escape and next character
+                else:
+                    index += 1
+            # Edge Case: Unclosed bracket
+            if index >= len(content):
+                raise ValueError("properties without delimiter")
+            value = content[value_start:index]
+            value = _unescape_text(value)
+            values.append(value)
+            index += 1  # Skip closing bracket
+        properties[key] = values
+    return properties, index
+def _unescape_text(text: str) -> str:
+    """
+    Process escape sequences in SGF text according to SGF specification.
+    Args:
+        text: The text to process
+    Returns:
+        str: The processed text
+    """
+    result = []
+    i = 0
+    while i < len(text):
+        if text[i] == '\\':
+            i += 1
+            if i < len(text):
+                # Check if next character is newline
+                if text[i] == '\n':
+                    # Newline immediately after \ is converted to space
+                    result.append(' ')
+                    i += 1
+                else:
+                    # Any character after \ follows the whitespace rules
+                    # All whitespace other than newline is converted to space
+                    if text[i].isspace():
+                        result.append(' ')
+                    else:
+                        result.append(text[i])
+                    i += 1
+        else:
+            # Convert all whitespace other than newline to spaces
+            if text[i].isspace() and text[i] != '\n':
+                result.append(' ')
+            else:
+                result.append(text[i])
+            i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, missing parentheses, missing semicolon, empty content, invalid property keys, missing delimiters, unclosed brackets, escape sequences
+# Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis, empty content after removing parentheses, missing semicolon after opening parenthesis
+# Handled Edge Cases: Empty subtree, missing semicolon in subtree
+# Handled Edge Cases: Key with no values, unclosed bracket
+# Handled Edge Cases: Newlines after backslash, whitespace conversion, escape character handling