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_newline_in_property_value_is_converted_to_nothing_at_all	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_multiple_properties	Fail
test_multiple_property_values	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_single_node_tree	Fail
test_two_child_trees	Fail
test_two_nodes	Fail
test_within_property_values_newlines_remain_as_newlines	Fail
test_within_property_values_whitespace_characters_such_as_tab_are_converted_to_spaces	Fail
test_all_lowercase_property	Pass
test_empty_input	Pass
test_node_without_properties	Pass
test_node_without_tree	Pass
test_properties_without_delimiter	Pass
test_tree_with_no_nodes	Pass
test_upper_and_lowercase_property	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 doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    return _parse_tree(content)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse a tree from its content string.
+    Args:
+        content: The content of the tree without outer parentheses
+    Returns:
+        SgfTree: The parsed tree
+    """
+    # Skip the initial ';'
+    index = 1
+    # Parse properties of the current node
+    properties, index = _parse_properties(content, index)
+    # Parse children
+    children = []
+    # Edge Case: Handle multiple variations
+    while index < len(content) and content[index] == '(':
+        # Find the matching closing parenthesis
+        balance = 1
+        start = index + 1
+        index += 1
+        while index < len(content) and balance > 0:
+            if content[index] == '(':
+                balance += 1
+            elif content[index] == ')':
+                balance -= 1
+            index += 1
+        # Edge Case: Unmatched parenthesis
+        if balance != 0:
+            raise ValueError("tree missing")
+        # Parse the subtree
+        subtree_content = content[start:index-1]
+        child = _parse_tree(subtree_content)
+        children.append(child)
+    return SgfTree(properties, children)
+def _parse_properties(content: str, index: int) -> tuple[dict, int]:
+    """
+    Parse properties from the content string starting at index.
+    Args:
+        content: The content string
+        index: The starting index
+    Returns:
+        tuple: A tuple of (properties_dict, next_index)
+    """
+    properties = {}
+    while index < len(content) and content[index].isalpha():
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isalpha():
+            index += 1
+        key = content[key_start:index]
+        # Edge Case: Key is not uppercase
+        if key != key.upper():
+            raise ValueError("property must be in uppercase")
+        # Edge Case: No values for the property
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        # Parse values
+        values = []
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip '['
+            value_start = index
+            # Parse value, handling escapes
+            while index < len(content):
+                if content[index] == '\\':
+                    # Skip the escape character
+                    index += 1
+                    if index < len(content):
+                        # Skip the escaped character
+                        index += 1
+                    else:
+                        # Edge Case: Escape at end of string
+                        raise ValueError("properties without delimiter")
+                elif content[index] == ']':
+                    # End of value (only if not escaped)
+                    break
+                else:
+                    index += 1
+            # Edge Case: Unmatched bracket
+            if index >= len(content):
+                raise ValueError("properties without delimiter")
+            value = content[value_start:index]
+            value = _unescape_value(value)
+            values.append(value)
+            index += 1  # Skip ']'
+        properties[key] = values
+        # If we encounter a ';' or '(', stop parsing properties
+        if index < len(content) and (content[index] == ';' or content[index] == '('):
+            break
+    # If we encounter a ';', skip it for the next node
+    if index < len(content) and content[index] == ';':
+        index += 1
+    return properties, index
+def _unescape_value(value: str) -> str:
+    """
+    Unescape SGF text value according to SGF specification.
+    Args:
+        value: The escaped value string
+    Returns:
+        str: The unescaped value
+    """
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            i += 1
+            if i < len(value):
+                # If next character is newline, remove both \ and newline
+                if value[i] == '\n':
+                    i += 1
+                else:
+                    # For other characters, insert as-is
+                    # But still apply whitespace conversion rules
+                    if value[i] != '\n' and value[i].isspace():
+                        result.append(' ')
+                    else:
+                        result.append(value[i])
+                    i += 1
+        else:
+            # Convert whitespace (except newline) to space
+            if value[i] != '\n' and value[i].isspace():
+                result.append(' ')
+            else:
+                result.append(value[i])
+            i += 1
+    return ''.join(result)
+    def __init__(self, properties: dict | None = None, children: list["SgfTree"] | None = None):
+        self.properties = properties or {}
+        self.children = children or []
+    def __eq__(self, other):
+        if not isinstance(other, SgfTree):
+            return False
+        for key, value in self.properties.items():
+            if key not in other.properties:
+                return False
+            if other.properties[key] != value:
+                return False
+        for key in other.properties.keys():
+            if key not in self.properties:
+                return False
+        if len(self.children) != len(other.children):
+            return False
+        for child, other_child in zip(self.children, other.children):
+            if child != other_child:
+                return False
+        return True
+    def __ne__(self, other):
+        return not self == other
+def parse(input_string: str) -> SgfTree:
+    """
+    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 doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    return _parse_tree(content)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse a tree from its content string.
+    Args:
+        content: The content of the tree without outer parentheses
+    Returns:
+        SgfTree: The parsed tree
+    """
+    # Skip the initial ';'
+    index = 1
+    # Parse properties of the current node
+    properties, index = _parse_properties(content, index)
+    # Parse children
+    children = []
+    # Edge Case: Handle multiple variations
+    while index < len(content) and content[index] == '(':
+        # Find the matching closing parenthesis
+        balance = 1
+        start = index + 1
+        index += 1
+        while index < len(content) and balance > 0:
+            if content[index] == '(':
+                balance += 1
+            elif content[index] == ')':
+                balance -= 1
+            index += 1
+        # Edge Case: Unmatched parenthesis
+        if balance != 0:
+            raise ValueError("tree missing")
+        # Parse the subtree
+        subtree_content = content[start:index-1]
+        child = _parse_tree(subtree_content)
+        children.append(child)
+    return SgfTree(properties, children)
+def _parse_properties(content: str, index: int) -> tuple[dict, int]:
+    """
+    Parse properties from the content string starting at index.
+    Args:
+        content: The content string
+        index: The starting index
+    Returns:
+        tuple: A tuple of (properties_dict, next_index)
+    """
+    properties = {}
+    while index < len(content) and content[index].isalpha():
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isalpha():
+            index += 1
+        key = content[key_start:index]
+        # Edge Case: Key is not uppercase
+        if key != key.upper():
+            raise ValueError("property must be in uppercase")
+        # Edge Case: No values for the property
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        # Parse values
+        values = []
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip '['
+            value_start = index
+            # Edge Case: Unmatched bracket
+            if index >= len(content):
+                raise ValueError("properties without delimiter")
+            value = content[value_start:index]
+            value = _unescape_value(value)
+            values.append(value)
+            index += 1  # Skip ']'
+        properties[key] = values
+        # If we encounter a ';' or '(', stop parsing properties
+        if index < len(content) and (content[index] == ';' or content[index] == '('):
+            break
+    # If we encounter a ';', skip it for the next node
+    if index < len(content) and content[index] == ';':
+        index += 1
+    return properties, index
+def _unescape_value(value: str) -> str:
+    """
+    Unescape SGF text value according to SGF specification.
+    Args:
+        value: The escaped value string
+    Returns:
+        str: The unescaped value
+    """
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            i += 1
+            if i < len(value):
+                # If next character is newline, remove both \ and newline
+                if value[i] == '\n':
+                    i += 1
+                else:
+                    # For other characters, insert as-is
+                    # But still apply whitespace conversion rules
+                    if value[i] != '\n' and value[i].isspace():
+                        result.append(' ')
+                    else:
+                        result.append(value[i])
+                    i += 1
+        else:
+            # Convert whitespace (except newline) to space
+            if value[i] != '\n' and value[i].isspace():
+                result.append(' ')
+            else:
+                result.append(value[i])
+            i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, Input doesn't start with '(', Input doesn't end with ')', Empty tree with no nodes, Tree doesn't start with ';', Unmatched parenthesis, Key is not uppercase, No values for the property, Unmatched bracket"