Finished

Test Name	Status
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_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")
+    # Edge Case: Tree missing semicolon
+    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 the 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 - can be either semicolon nodes or parenthesized variations
+    while remaining:
+        if remaining.startswith(';'):
+            # Parse a child node created by semicolon
+            child_tree = _parse_tree(remaining)
+            children.append(child_tree)
+            remaining = ""  # All remaining content is consumed by the child
+        elif remaining.startswith('('):
+            # Parse a variation in parentheses
+            # Find the matching parenthesis for this child
+            balance = 1
+            i = 1
+            while i < len(remaining) and balance > 0:
+                if remaining[i] == '(':
+                    balance += 1
+                elif remaining[i] == ')':
+                    balance -= 1
+                i += 1
+            # Edge Case: Unmatched parenthesis
+            if balance != 0:
+                raise ValueError("tree missing")
+            # Parse the child tree
+            child_content = remaining[1:i-1]
+            child_tree = _parse_tree(child_content)
+            children.append(child_tree)
+            # Move to the next potential child
+            remaining = remaining[i:]
+        else:
+            # No more children
+            break
+    return SgfTree(properties, children)
+def _parse_properties(content: str) -> tuple[dict, str]:
+    """
+    Parse properties from the content string.
+    Args:
+        content: String containing properties
+    Returns:
+        tuple: (properties dictionary, 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]
+        # Edge Case: Property key is not uppercase
+        if key != key.upper():
+            raise ValueError("property must be in uppercase")
+        remaining = remaining[key_end:]
+        # Edge Case: Missing opening bracket
+        if not remaining.startswith('['):
+            raise ValueError("properties without delimiter")
+        # Parse values
+        values = []
+        while remaining.startswith('['):
+            remaining = remaining[1:]  # Skip opening bracket
+            # Parse value
+            value, remaining = _parse_value(remaining)
+            # Edge Case: Missing closing bracket
+            if not remaining.startswith(']'):
+                raise ValueError("properties without delimiter")
+            remaining = remaining[1:]  # Skip closing bracket
+            values.append(value)
+        properties[key] = values
+    return properties, remaining
+def _parse_value(content: str) -> tuple[str, str]:
+    """
+    Parse a value from the content string.
+    Args:
+        content: String containing a value
+    Returns:
+        tuple: (parsed value, remaining string)
+    """
+    value = []
+    i = 0
+    while i < len(content):
+        if content[i] == ']':
+            # End of value
+            break
+        if content[i] == '\\':
+            # Handle escape character
+            i += 1
+            # Edge Case: Escape at end of value
+            if i >= len(content):
+                raise ValueError("properties without delimiter")
+            char = content[i]
+            # If next character is newline, remove the backslash and newline
+            if char == '\n':
+                # Do nothing - remove the backslash and newline
+                pass
+            elif char.isspace():
+                # Any whitespace character after \ follows the normal rules
+                # All whitespace characters other than newline are converted to spaces
+                value.append(' ')
+            else:
+                # Any non-whitespace character after \ is inserted as-is
+                value.append(char)
+        else:
+            char = content[i]
+            if char == '\n':
+                # Newlines remain as newlines
+                value.append(char)
+            elif char.isspace() and char != '\n':
+                # All whitespace characters other than newline are converted to spaces
+                value.append(' ')
+            else:
+                value.append(char)
+        i += 1
+    return ''.join(value), content[i:]
+# Handled Edge Cases: Empty input, Input doesn't start with '(', Input doesn't end with ')', Empty tree with no nodes, Tree missing semicolon, Unmatched parenthesis, Property key is not uppercase, Missing opening bracket, Missing closing bracket, Escape at end of value