Finished

Test Name	Status
test_empty_input	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_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_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 (Smart Game Format) string and return a tree structure of properties.
+    Args:
+        input_string: A string containing SGF formatted data
+    Returns:
+        SgfTree: A tree structure representing the SGF data
+    Raises:
+        ValueError: If the input is malformed according to SGF specifications
+    """
+    # Edge Case: Empty input should raise "tree with no nodes" per overlapping exception analysis
+    if not input_string:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Input that doesn't start with '('
+    if not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Input that starts with '(' but doesn't end with ')'
+    if not input_string.endswith(')'):
+        raise ValueError("tree missing")
+    # Edge Case: Input with just parentheses but no content
+    if len(input_string) <= 2:
+        raise ValueError("tree with no nodes")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    # Edge Case: Content is empty after removing parentheses
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Parse the content
+    return _parse_tree_content(content)
+def _parse_tree_content(content: str) -> SgfTree:
+    """
+    Parse the content inside the outer parentheses of an SGF string.
+    Args:
+        content: The content inside the outer parentheses
+    Returns:
+        SgfTree: A tree structure representing the SGF data
+    """
+    # Edge Case: Content that doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree with no nodes")
+    # Skip the first ';'
+    content = content[1:]
+    # Parse the first node
+    node_content, content = _split_node_content(content)
+    properties = _parse_node_properties(node_content)
+    children = []
+    # Parse any children
+    while content:
+        if content.startswith('('):
+            # Parse a subtree
+            subtree_content, content = _split_subtree_content(content)
+            children.append(_parse_tree_content(subtree_content[1:-1]))
+        else:
+            # Parse another node in the same sequence
+            node_content, content = _split_node_content(content)
+            node_properties = _parse_node_properties(node_content)
+            # Create a new tree node with these properties and any further children
+            new_node = SgfTree(properties=node_properties)
+            # Handle any children of this node
+            if content and content.startswith('('):
+                subtree_content, content = _split_subtree_content(content)
+                new_node.children = [_parse_tree_content(subtree_content[1:-1])]
+            children = [new_node]
+            break
+    return SgfTree(properties=properties, children=children)
+def _split_node_content(content: str) -> tuple[str, str]:
+    """
+    Split the content into the current node's content and the rest.
+    Args:
+        content: The remaining content to parse
+    Returns:
+        tuple: (current node content, remaining content)
+    """
+    # Find the end of this node - either end of string, ';' for next node, or '(' for child
+    i = 0
+    while i < len(content):
+        if content[i] in [';', '(']:
+            break
+        i += 1
+    return content[:i], content[i:]
+def _split_subtree_content(content: str) -> tuple[str, str]:
+    """
+    Split the content into a subtree and the rest.
+    Args:
+        content: The remaining content to parse, starting with '('
+    Returns:
+        tuple: (subtree content including parentheses, remaining content)
+    """
+    # Edge Case: Content doesn't start with '('
+    if not content.startswith('('):
+        raise ValueError("tree missing")
+    balance = 1
+    i = 1  # Skip the first '('
+    while i < len(content) and balance > 0:
+        if content[i] == '(':
+            balance += 1
+        elif content[i] == ')':
+            balance -= 1
+        i += 1
+    # Edge Case: Unbalanced parentheses
+    if balance != 0:
+        raise ValueError("tree missing")
+    return content[:i], content[i:]
+def _parse_node_properties(content: str) -> dict:
+    """
+    Parse the properties of a node.
+    Args:
+        content: The content of a node (without the leading ';')
+    Returns:
+        dict: A dictionary of properties
+    """
+    properties = {}
+    i = 0
+    while i < len(content):
+        # Skip any whitespace (though SGF spec says no optional whitespace)
+        while i < len(content) and content[i].isspace():
+            i += 1
+        if i >= len(content):
+            break
+        # Parse property key
+        key_start = i
+        # Edge Case: Property key that is not all uppercase
+        while i < len(content) and content[i].isalpha():
+            if not content[i].isupper():
+                raise ValueError("property must be in uppercase")
+            i += 1
+        # Edge Case: No key found
+        if i == key_start:
+            raise ValueError("properties without delimiter")
+        key = content[key_start:i]
+        # Edge Case: Key without value
+        if i >= len(content) or content[i] != '[':
+            raise ValueError("properties without delimiter")
+        # Parse property values
+        values = []
+        while i < len(content) and content[i] == '[':
+            i += 1  # Skip '['
+            value_start = i
+            # Parse value, handling escaping
+            while i < len(content):
+                if content[i] == ']':
+                    # Found the end of the value
+                    break
+                elif content[i] == '\\':
+                    i += 1  # Skip escape character
+                    if i < len(content):
+                        i += 1  # Skip escaped character
+                else:
+                    i += 1
+            # Edge Case: Unclosed value bracket
+            if i >= len(content):
+                raise ValueError("properties without delimiter")
+            value = content[value_start:i]
+            value = _unescape_value(value)
+            values.append(value)
+            i += 1  # Skip ']'
+        properties[key] = values
+    return properties
+    return properties
+def _unescape_value(value: str) -> str:
+    """
+    Unescape an SGF value according to SGF Text type rules.
+    Args:
+        value: The escaped value string
+    Returns:
+        str: The unescaped value string
+    """
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            i += 1  # Skip the escape character
+            # Edge Case: Escape at end of string
+            if i >= len(value):
+                # Treat backslash at end as literal backslash
+                result.append('\\')
+                break
+            char = value[i]
+            # Handle newline removal after backslash
+            if char == '\n':
+                # Newline character is removed if immediately after \
+                i += 1
+                continue
+            elif char in [' ', '\t', '\r', '\f', '\v']:  # All whitespace except newline
+                # Whitespace after \ is converted to space
+                result.append(' ')
+            else:
+                # Any non-whitespace character after \ is inserted as-is
+                result.append(char)
+        elif value[i] in [' ', '\t', '\r', '\f', '\v']:  # All whitespace except newline
+            # All whitespace characters other than newline are converted to spaces
+            result.append(' ')
+        else:
+            result.append(value[i])
+        i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, missing parentheses, content without nodes, missing semicolon, unbalanced parentheses, non-uppercase properties, missing delimiters, unclosed brackets, escape at end of string, newline handling, whitespace conversion
+# Handled Edge Cases: Empty input, missing closing parenthesis, content without nodes
+# Handled Edge Cases: Missing semicolon, content without nodes
+# Handled Edge Cases: Missing opening parenthesis, unbalanced parentheses
+# Handled Edge Cases: Missing key, non-uppercase key, missing opening bracket, unclosed bracket
+# Handled Edge Cases: Escape at end of string, newline handling, whitespace conversion