Finished

Test Name	Status
test_escaped_t_and_n_in_property_value_are_just_letters_not_whitespace	Fail
test_escaped_tab_in_property_value_is_converted_to_space	Fail
test_opening_bracket_within_property_value_doesn_t_need_to_be_escaped	Fail
test_parentheses_in_property_value_don_t_need_to_be_escaped	Fail
test_semicolon_in_property_value_doesn_t_need_to_be_escaped	Fail
test_two_nodes	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_newline_in_property_value_is_converted_to_nothing_at_all	Pass
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	Pass
test_multiple_properties	Pass
test_multiple_property_values	Pass
test_node_without_properties	Pass
test_node_without_tree	Pass
test_properties_without_delimiter	Pass
test_single_node_tree	Pass
test_tree_with_no_nodes	Pass
test_two_child_trees	Pass
test_upper_and_lowercase_property	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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 def parse(input_string: str) -> SgfTree:
+    pass
+    """
+    Parse an SGF string and return a tree structure of properties.
+    Args:
+        input_string: A string in SGF format
+    Returns:
+        SgfTree: The parsed SGF tree
+    Raises:
+        ValueError: If the input is invalid according to SGF format rules
+    """
+    # Edge Case: Empty input
+    if not input_string:
+        raise ValueError("tree missing")
+    # Edge Case: Input doesn't start with '('
+    if not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Input doesn't end with ')'
+    if not input_string.endswith(')'):
+        raise ValueError("tree missing")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    # Edge Case: Empty tree with no nodes
+    if not content:
+        raise ValueError("tree with no nodes")
+    return _parse_tree(content)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse the content inside the parentheses of an SGF tree.
+    Args:
+        content: The content inside the outer parentheses
+    Returns:
+        SgfTree: The parsed SGF tree
+    """
+    # Edge Case: Content starts with ';' - it's a node
+    if content.startswith(';'):
+        properties, remaining = _parse_properties(content[1:])
+        children = []
+        # Parse children if any
+        while remaining:
+            if remaining.startswith('('):
+                child, remaining = _parse_subtree(remaining)
+                children.append(child)
+            else:
+                # This is a shorthand for a single child
+                child_content = remaining
+                child = _parse_tree(';' + child_content)
+                children.append(child)
+                remaining = ''
+        return SgfTree(properties=properties, children=children)
+    # Edge Case: Content starts with '(' - it's a variation
+    elif content.startswith('('):
+        # This should not happen at the top level
+        raise ValueError("tree missing")
+    # Edge Case: Invalid content
+    else:
+        raise ValueError("tree missing")
+def _parse_subtree(content: str) -> tuple[SgfTree, str]:
+    """
+    Parse a subtree enclosed in parentheses.
+    Args:
+        content: String starting with '('
+    Returns:
+        tuple: (parsed SgfTree, remaining string)
+    """
+    # Find the matching closing parenthesis
+    depth = 0
+    i = 0
+    # Edge Case: No opening parenthesis
+    if not content.startswith('('):
+        raise ValueError("tree missing")
+    for i, char in enumerate(content):
+        if char == '(':
+            depth += 1
+        elif char == ')':
+            depth -= 1
+            if depth == 0:
+                break
+    # Edge Case: No matching closing parenthesis
+    if depth != 0:
+        raise ValueError("tree missing")
+    subtree_content = content[1:i]  # Exclude the parentheses
+    remaining = content[i+1:]
+    return _parse_tree(subtree_content), remaining
+def _parse_properties(content: str) -> tuple[dict, str]:
+    """
+    Parse properties from a node.
+    Args:
+        content: String containing properties
+    Returns:
+        tuple: (properties dict, remaining string)
+    """
+    properties = {}
+    remaining = content
+    while remaining and remaining[0].isalpha():
+        # Parse key
+        key_end = 0
+        while key_end < len(remaining) and remaining[key_end].isalpha():
+            key_end += 1
+        key = remaining[:key_end]
+        remaining = remaining[key_end:]
+        # Edge Case: Key is not uppercase
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        # Edge Case: No values
+        if not remaining.startswith('['):
+            raise ValueError("properties without delimiter")
+        # Parse values
+        values = []
+        while remaining.startswith('['):
+            remaining = remaining[1:]  # Skip '['
+            value, remaining = _parse_value(remaining)
+            values.append(value)
+        properties[key] = values
+    return properties, remaining
+def _parse_value(content: str) -> tuple[str, str]:
+    """
+    Parse a single value enclosed in brackets.
+    Args:
+        content: String starting after the opening bracket
+    Returns:
+        tuple: (parsed value, remaining string)
+    """
+    value = ''
+    i = 0
+    while i < len(content):
+        char = content[i]
+        if char == ']':
+            # End of value
+            break
+        elif char == '\\':
+            # Escape character
+            i += 1
+            if i < len(content):
+                next_char = content[i]
+                if next_char == 'n' or next_char == 'r' or next_char == 't':
+                    # These are not special escape sequences in SGF
+                    value += '\\' + next_char
+                elif next_char == '\n':
+                    # Newline escaped - remove if immediately after backslash
+                    pass
+                else:
+                    value += next_char
+            else:
+                # Trailing backslash
+                value += '\\'
+        elif char == '\n':
+            # Newline - check if it's escaped
+            if i > 0 and content[i-1] == '\\':
+                # It's escaped, so it was already handled
+                pass
+            else:
+                value += char
+        elif char.isspace() and char != '\n':
+            # All whitespace other than newline becomes space
+            value += ' '
+        else:
+            value += char
+        i += 1
+    # Edge Case: No closing bracket
+    if i >= len(content) or content[i] != ']':
+        raise ValueError("properties without delimiter")
+    return value, content[i+1:]
+# Handled Edge Cases: Empty input, Input doesn't start with '(', Input doesn't end with ')', Empty tree with no nodes, Content starts with ';', Content starts with '(', Invalid content, No opening parenthesis, No matching closing parenthesis, Key is not uppercase, No values, No closing bracket