Finished

Test Name	Status
test_escaped_backslash_in_property_value_becomes_just_a_backslash	Fail
test_upper_and_lowercase_property	Fail
test_all_lowercase_property	Pass
test_empty_input	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 malformed or doesn't follow 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")
+    # Parse the tree and get the result along with the remaining string
+    tree, remaining = _parse_tree(input_string)
+    # Edge Case: There's remaining text after parsing the tree
+    if remaining:
+        raise ValueError("tree missing")
+    return tree
+def _parse_tree(s: str) -> tuple[SgfTree, str]:
+    """
+    Parse a tree from the input string.
+    Args:
+        s: Input string starting with '('
+    Returns:
+        tuple: (parsed SgfTree, remaining string)
+    """
+    # Edge Case: Missing opening parenthesis
+    if not s.startswith('('):
+        raise ValueError("tree missing")
+    s = s[1:]  # Remove the opening '('
+    # Edge Case: Empty tree
+    if not s:
+        raise ValueError("tree with no nodes")
+    # Parse the sequence of nodes
+    nodes = []
+    while s and not s.startswith(')') and not s.startswith('('):
+        node, s = _parse_node(s)
+        nodes.append(node)
+    # Edge Case: No nodes in tree
+    if not nodes:
+        raise ValueError("tree with no nodes")
+    # Handle variations (children)
+    children = []
+    while s and s.startswith('('):
+        child, s = _parse_tree(s)
+        children.append(child)
+    # Edge Case: Missing closing parenthesis
+    if not s or not s.startswith(')'):
+        raise ValueError("tree missing")
+    s = s[1:]  # Remove the closing ')'
+    # Build the tree structure - the first node is the root, others are its children chain
+    if not nodes:
+        raise ValueError("tree with no nodes")
+    # Create the root node
+    root = nodes[0]
+    # Chain the nodes - each node (except the last) has the next as its only child
+    current = root
+    for node in nodes[1:]:
+        current.children = [node]
+        current = node
+    # Add variations to the root
+    if children:
+        root.children.extend(children)
+    return root, s
+def _parse_node(s: str) -> tuple[SgfTree, str]:
+    """
+    Parse a single node from the input string.
+    Args:
+        s: Input string starting with ';'
+    Returns:
+        tuple: (parsed SgfTree node, remaining string)
+    """
+    # Edge Case: Missing semicolon
+    if not s.startswith(';'):
+        raise ValueError("tree missing")
+    s = s[1:]  # Remove the semicolon
+    properties = {}
+    # Check if there are any properties
+    if s and s[0].isalpha():
+        # If there's a character but it's not uppercase, it's an error
+        if not s[0].isupper():
+            raise ValueError("property must be in uppercase")
+    # Parse properties while we have uppercase letters
+    while s and s[0].isupper():
+        key, values, s = _parse_property(s)
+        properties[key] = values
+    # Edge Case: No properties in node (empty node)
+    if not properties and (not s or (s[0] != ')' and s[0] != '(' and s[0] != ';')):
+        # This is a bit tricky - we need to distinguish between an empty node and a node with children
+        # For now, let's check if we have a valid continuation
+        pass
+    return SgfTree(properties=properties), s
+def _parse_property(s: str) -> tuple[str, list[str], str]:
+    """
+    Parse a property (key with one or more values) from the input string.
+    Args:
+        s: Input string starting with an uppercase letter
+    Returns:
+        tuple: (property key, list of property values, remaining string)
+    """
+    # Edge Case: Property key is not uppercase
+    if not s or not s[0].isupper():
+        raise ValueError("property must be in uppercase")
+    # Parse the key (sequence of uppercase letters)
+    key_end = 0
+    while key_end < len(s) and s[key_end].isupper():
+        key_end += 1
+    key = s[:key_end]
+    s = s[key_end:]
+    # Edge Case: Missing opening bracket for value
+    if not s or s[0] != '[':
+        raise ValueError("properties without delimiter")
+    values = []
+    # Parse one or more values
+    while s and s.startswith('['):
+        value, s = _parse_value(s)
+        values.append(value)
+    return key, values, s
+def _parse_value(s: str) -> tuple[str, str]:
+    """
+    Parse a single value from the input string.
+    Args:
+        s: Input string starting with '['
+    Returns:
+        tuple: (parsed value, remaining string)
+    """
+    # Edge Case: Missing opening bracket
+    if not s or s[0] != '[':
+        raise ValueError("properties without delimiter")
+    s = s[1:]  # Remove the opening '['
+    value = []
+    i = 0
+    # Process characters until we find the closing bracket
+    while i < len(s):
+        char = s[i]
+        if char == ']' and (i == 0 or s[i-1] != '\\'):
+            # Found the end of the value (only if not escaped)
+            break
+        elif char == '\\':
+            # Handle escape sequences
+            i += 1
+            if i >= len(s):
+                # Edge Case: Escape character at end of string
+                raise ValueError("properties without delimiter")
+            next_char = s[i]
+            if next_char == '\n':
+                # Newline immediately after backslash - remove it
+                pass
+            elif next_char in (' ', '\t'):
+                # Escaped whitespace - convert to space
+                value.append(' ')
+            else:
+                # Any other escaped character - insert as-is
+                value.append(next_char)
+        elif char in (' ', '\t'):
+            # Convert all whitespace (except newlines) to spaces
+            value.append(' ')
+        else:
+            # Regular character
+            value.append(char)
+        i += 1
+    # Edge Case: Missing closing bracket
+    if i >= len(s) or s[i] != ']':
+        raise ValueError("properties without delimiter")
+    # Join the value and return with the remaining string
+    return ''.join(value), s[i+1:]
+# Handled Edge Cases: Empty input, missing opening parenthesis, empty tree, no nodes in tree, missing closing parenthesis, missing semicolon, property key not uppercase, missing opening bracket for value, missing opening bracket, escape character at end of string, missing closing bracket