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_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_escaped_tab_in_property_value_is_converted_to_space	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 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
+    index = 1
+    # Parse properties of the current node
+    properties, index = _parse_properties(content, index)
+    # Parse children
+    children = []
+    while index < len(content):
+        if content[index] == '(':  # Start of a child tree
+            child_tree, consumed = _parse_subtree(content[index:])
+            children.append(child_tree)
+            index += consumed
+        else:
+            # If we encounter a semicolon, it's a shorthand for a child node
+            if content[index] == ';':
+                # Parse the remaining as a single child
+                child_content = content[index:]
+                child_tree = _parse_tree(child_content)
+                children.append(child_tree)
+                break
+            else:
+                # Unexpected character
+                raise ValueError("tree missing")
+    return SgfTree(properties=properties, children=children)
+def _parse_subtree(content: str) -> tuple[SgfTree, int]:
+    """
+    Parse a subtree enclosed in parentheses.
+    Args:
+        content: The content starting with '('
+    Returns:
+        tuple: (parsed tree, number of characters consumed)
+    """
+    # Edge Case: Empty subtree
+    if len(content) < 2 or content[0] != '(':
+        raise ValueError("tree missing")
+    # Find matching closing parenthesis
+    depth = 1
+    index = 1
+    while index < len(content) and depth > 0:
+        if content[index] == '(':
+            depth += 1
+        elif content[index] == ')':
+            depth -= 1
+        index += 1
+    # Edge Case: Unmatched parentheses
+    if depth != 0:
+        raise ValueError("tree missing")
+    # Parse the content inside the parentheses
+    inner_content = content[1:index-1]
+    # Edge Case: Empty subtree content
+    if not inner_content:
+        raise ValueError("tree with no nodes")
+    tree = _parse_tree(inner_content)
+    return tree, index
+def _parse_properties(content: str, start_index: int) -> tuple[dict, int]:
+    """
+    Parse properties from the content starting at start_index.
+    Args:
+        content: The content to parse
+        start_index: The index to start parsing from
+    Returns:
+        tuple: (properties dictionary, next index to parse)
+    """
+    properties = {}
+    index = start_index
+    while index < len(content):
+        char = content[index]
+        # If we encounter a parenthesis or semicolon, it means properties are done
+        if char in '();':
+            break
+        # Parse property key
+        key_start = index
+        while index < len(content) and content[index].isalpha():
+            index += 1
+        key = content[key_start:index]
+        # Edge Case: Empty key
+        if not key:
+            raise ValueError("properties without delimiter")
+        # Edge Case: Key not in uppercase
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        # Parse values
+        values = []
+        # There must be at least one value
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip '['
+            value_start = index
+            # Parse value until closing bracket
+            while index < len(content) and content[index] != ']':
+                index += 1
+            # Edge Case: Unclosed bracket
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            value = content[value_start:index]
+            value = _unescape_value(value)
+            values.append(value)
+            index += 1  # Skip ']'
+        properties[key] = values
+    return properties, index
+def _unescape_value(value: str) -> str:
+    """
+    Unescape an SGF value according to SGF text type rules.
+    Args:
+        value: The escaped value
+    Returns:
+        str: The unescaped value
+    """
+    result = []
+    index = 0
+    while index < len(value):
+        if value[index] == '\\':
+            # Look at the next character
+            if index + 1 < len(value):
+                next_char = value[index + 1]
+                # If next character is a newline, remove the backslash and newline
+                if next_char == '\n':
+                    index += 2  # Skip backslash and newline
+                    continue
+                elif next_char.isspace():
+                    # For whitespace characters (except newline), convert to space
+                    result.append(' ')
+                    index += 2
+                else:
+                    # For non-whitespace characters, preserve the backslash and insert the character
+                    result.append('\\')
+                    result.append(next_char)
+                    index += 2
+            else:
+                # Backslash at end of string, just add the backslash
+                result.append('\\')
+                index += 1
+        else:
+            # Convert whitespace (except newline) to space
+            if value[index] != '\n' and value[index].isspace():
+                result.append(' ')
+            else:
+                result.append(value[index])
+            index += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis, empty tree, missing semicolon, unmatched parentheses, empty subtree content, empty key, key not in uppercase, missing delimiter for properties, unclosed bracket