Finished

Test Name	Status
test_escaped_backslash_in_property_value_becomes_just_a_backslash	Fail
test_escaped_closing_bracket_within_property_value_becomes_just_a_closing_bracket	Fail
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_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	Fail
test_opening_bracket_within_property_value_doesn_t_need_to_be_escaped	Fail
test_all_lowercase_property	Pass
test_empty_input	Pass
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all	Pass
test_multiple_properties	Pass
test_multiple_property_values	Pass
test_node_without_properties	Pass
test_node_without_tree	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_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 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 main 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: The input string starting with '('
+    Returns:
+        tuple: A tuple containing the parsed SgfTree and the 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 first node
+    node, s = _parse_node(s)
+    children = []
+    # Parse any child trees (variations)
+    while s.startswith('('):
+        child, s = _parse_tree(s)
+        children.append(child)
+    # Parse single child nodes (shorthand notation)
+    if s.startswith(';'):
+        # For shorthand notation, we need to build a chain of children
+        child_nodes = []
+        while s.startswith(';'):
+            child_node, s = _parse_node(s)
+            child_nodes.append(child_node)
+        # Build the chain of children
+        if child_nodes:
+            # Create the first child
+            first_child = SgfTree(properties=child_nodes[0][0], children=[])
+            children.append(first_child)
+            # Chain the rest of the children
+            current_parent = first_child
+            for child_node in child_nodes[1:]:
+                child_tree = SgfTree(properties=child_node[0], children=[])
+                current_parent.children.append(child_tree)
+                current_parent = child_tree
+    # Edge Case: Missing closing parenthesis
+    if not s.startswith(')'):
+        raise ValueError("tree missing")
+    s = s[1:]  # Remove the closing ')'
+    return SgfTree(properties=node[0], children=children), s
+    # Edge Case: Missing closing parenthesis
+    if not s.startswith(')'):
+        raise ValueError("tree missing")
+    s = s[1:]  # Remove the closing ')'
+    return SgfTree(properties=node[0], children=children), s
+def _parse_node(s: str) -> tuple[tuple[dict, list], str]:
+    """
+    Parse a node from the input string.
+    Args:
+        s: The input string starting with ';'
+    Returns:
+        tuple: A tuple containing the parsed node (properties, children) and the remaining string
+    """
+    # Edge Case: Missing semicolon
+    if not s.startswith(';'):
+        raise ValueError("tree with no nodes")
+    s = s[1:]  # Remove the ';'
+    properties = {}
+    # Parse properties while we have letters (validation happens in _parse_property)
+    while s and s[0].isalpha():
+        key, values, s = _parse_property(s)
+        properties[key] = values
+    return (properties, []), s
+def _parse_property(s: str) -> tuple[str, list[str], str]:
+    """
+    Parse a property (key with values) from the input string.
+    Args:
+        s: The input string starting with a property key
+    Returns:
+        tuple: A tuple containing the key, list of values, and the remaining string
+    """
+    # Find the key (sequence of letters)
+    key_end = 0
+    while key_end < len(s) and s[key_end].isalpha():
+        key_end += 1
+    # Edge Case: Key is empty
+    if key_end == 0:
+        raise ValueError("property must be in uppercase")
+    key = s[:key_end]
+    s = s[key_end:]
+    # Edge Case: Key is not all uppercase
+    if not key.isupper():
+        raise ValueError("property must be in uppercase")
+    # Edge Case: Missing opening bracket
+    if not s.startswith('['):
+        raise ValueError("properties without delimiter")
+    values = []
+    # Parse all values for this key
+    while s.startswith('['):
+        value, s = _parse_value(s[1:])  # Skip the opening '['
+        values.append(value)
+    return key, values, s
+def _parse_value(s: str) -> tuple[str, str]:
+    """
+    Parse a value from the input string.
+    Args:
+        s: The input string starting with the value content
+    Returns:
+        tuple: A tuple containing the parsed value and the remaining string (after the closing ']')
+    """
+    result = []
+    i = 0
+    while i < len(s):
+        char = s[i]
+        if char == ']':
+            # End of value
+            break
+        elif char == '\\':
+            # Escape character
+            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 is removed
+                pass  # Do nothing, skip the newline
+            elif next_char == ']':
+                # Backslash before closing bracket is treated as literal backslash
+                result.append('\\')
+                # Don't consume the ']', let the main loop handle it
+                i -= 1
+            else:
+                # Any other character after backslash is inserted as-is
+                result.append('\\')  # Add the backslash
+                result.append(next_char)  # Add the escaped character
+        elif char == '\n':
+            # Newlines remain as newlines unless immediately after backslash
+            result.append(char)
+        elif char.isspace() and char != '\n':
+            # All whitespace other than newline converted to space
+            result.append(' ')
+        else:
+            # Regular character
+            result.append(char)
+        i += 1
+    # Edge Case: Missing closing bracket
+    if i >= len(s) or s[i] != ']':
+        raise ValueError("properties without delimiter")
+    # Return the parsed value and the remaining string after the closing ']'
+    return ''.join(result), s[i+1:]
+# Handled Edge Cases: Empty input, missing opening parenthesis, empty tree, missing closing parenthesis, missing semicolon, key is empty, missing opening bracket, escape character at end of string, missing closing bracket