Finished

Test Name	Status
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_newline_in_property_value_is_converted_to_nothing_at_all	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_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_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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 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: 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 tree with no nodes
+    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)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse the content of a tree (without outer parentheses).
+    Args:
+        content: The content of the tree
+    Returns:
+        SgfTree: The parsed tree
+    """
+    # Skip the initial semicolon
+    content = content[1:]
+    # Parse properties of the current node
+    properties, remaining = _parse_properties(content)
+    children = []
+    # Parse children
+    while remaining:
+        if remaining.startswith(';'):
+            # Parse a sequential child node
+            child_tree, remaining = _parse_sequential_node(remaining)
+            children.append(child_tree)
+        elif remaining.startswith('('):
+            # Parse a subtree (variation)
+            subtree, remaining = _parse_subtree(remaining)
+            children.append(subtree)
+        else:
+            # No more children
+            break
+    return SgfTree(properties=properties, children=children)
+def _parse_sequential_node(content: str) -> tuple[SgfTree, str]:
+    """
+    Parse a sequential node (starting with semicolon) and return both the tree and remaining content.
+    Args:
+        content: String starting with ';'
+    Returns:
+        tuple: (parsed tree, remaining string)
+    """
+    # Skip the initial semicolon
+    content = content[1:]
+    # Parse properties of the current node
+    properties, remaining = _parse_properties(content)
+    children = []
+    # Parse children
+    while remaining:
+        if remaining.startswith(';'):
+            # Parse a sequential child node
+            child_tree, remaining = _parse_sequential_node(remaining)
+            children.append(child_tree)
+        elif remaining.startswith('('):
+            # Parse a subtree (variation)
+            subtree, remaining = _parse_subtree(remaining)
+            children.append(subtree)
+        else:
+            # No more children
+            break
+    return SgfTree(properties=properties, children=children), remaining
+def _parse_properties(content: str) -> tuple[dict, str]:
+    """
+    Parse properties from the content string.
+    Args:
+        content: String containing properties
+    Returns:
+        tuple: (properties dict, remaining string)
+    """
+    properties = {}
+    remaining = content
+    while remaining and remaining[0] not in '();':
+        # Parse key
+        key_end = 0
+        while key_end < len(remaining) and remaining[key_end].isalpha() and remaining[key_end].isupper():
+            key_end += 1
+        # Edge Case: Property key is not in uppercase
+        if key_end == 0:
+            raise ValueError("property must be in uppercase")
+        key = remaining[:key_end]
+        remaining = remaining[key_end:]
+        # Edge Case: Missing opening bracket for property value
+        if not remaining.startswith('['):
+            raise ValueError("properties without delimiter")
+        # Parse all values for this key
+        values = []
+        while remaining.startswith('['):
+            remaining = remaining[1:]  # Skip opening bracket
+            value, remaining = _parse_value(remaining)
+            values.append(value)
+            # Edge Case: Missing closing bracket
+            if not remaining.startswith(']'):
+                raise ValueError("properties without delimiter")
+            remaining = remaining[1:]  # Skip closing bracket
+        properties[key] = values
+    return properties, remaining
+def _parse_value(content: str) -> tuple[str, str]:
+    """
+    Parse a single property value according to SGF Text type rules.
+    Args:
+        content: String containing the value (after opening bracket)
+    Returns:
+        tuple: (parsed value, remaining string)
+    """
+    value = []
+    i = 0
+    # Parse until we find an unescaped closing bracket
+    while i < len(content):
+        if content[i] == ']':
+            # Count how many consecutive backslashes precede this bracket
+            backslash_count = 0
+            j = i - 1
+            while j >= 0 and content[j] == '\\':
+                backslash_count += 1
+                j -= 1
+            # If even number of backslashes, the bracket is not escaped
+            # If odd number of backslashes, the bracket is escaped
+            if backslash_count % 2 == 0:
+                # Found an unescaped closing bracket
+                break
+            else:
+                # This bracket is escaped, treat it as a literal character
+                value.append(']')
+                i += 1
+                continue
+        elif content[i] == '\\':  # Escape character
+            i += 1
+            if i >= len(content):
+                # Edge Case: Escape character at end of content
+                value.append('\\')
+                break
+            char = content[i]
+            if char == '\n':
+                # Newline immediately after \ is removed
+                pass
+            elif char.isspace():
+                # Whitespace after \ is converted to space, except \n which is removed
+                value.append(' ')
+            else:
+                # Any non-whitespace character after \ is inserted as-is
+                value.append(char)
+        elif content[i] == '\n':
+            # Newlines are kept as newlines
+            value.append('\n')
+        elif content[i].isspace() and content[i] != '\n':
+            # All whitespace other than newline is converted to space
+            value.append(' ')
+        else:
+            # Regular character
+            value.append(content[i])
+        i += 1
+    # Edge Case: Unclosed value (this should be caught earlier but just in case)
+    if i >= len(content):
+        raise ValueError("properties without delimiter")
+    return ''.join(value), content[i:]
+def _parse_subtree(content: str) -> tuple[SgfTree, str]:
+    """
+    Parse a subtree enclosed in parentheses.
+    Args:
+        content: String starting with '('
+    Returns:
+        tuple: (parsed subtree, remaining string)
+    """
+    # Edge Case: Not starting with '('
+    if not content.startswith('('):
+        raise ValueError("tree missing")
+    # Find matching closing parenthesis
+    depth = 0
+    i = 0
+    for i, char in enumerate(content):
+        if char == '(':
+            depth += 1
+        elif char == ')':
+            depth -= 1
+            if depth == 0:
+                # Found the matching closing parenthesis
+                subtree_content = content[1:i]  # Exclude the parentheses
+                remaining = content[i+1:]
+                return _parse_tree(subtree_content), remaining
+    # Edge Case: Unmatched parentheses
+    raise ValueError("tree missing")
+# Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis, empty tree with no nodes, missing semicolon after opening parenthesis, property key is not in uppercase, missing opening bracket for property value, missing closing bracket, escape character at end of content, unclosed value, not starting with '(', unmatched parentheses