Finished

Test Name	Status
test_upper_and_lowercase_property	Fail
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_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 or input that doesn't start with '('
+    if not input_string or not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Input that 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 content after removing parentheses
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Content that doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    return _parse_tree(content)
+    # Handled Edge Cases: Empty input, input without proper delimiters, input without starting '(', input without ending ')', empty content after parentheses removal, content not starting with ';'
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse the content of an SGF tree.
+    Args:
+        content: The content inside the outer parentheses
+    Returns:
+        SgfTree: The parsed SGF 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, index = _parse_subtree(content, index)
+            children.append(child_tree)
+        else:
+            # If we encounter a semicolon, it's a shorthand for a child node
+            if content[index] == ';':
+                # Parse the next node as a child
+                child_content = content[index:]
+                child_tree = _parse_tree(child_content)
+                children.append(child_tree)
+                break  # The rest is handled by the child
+            else:
+                # Unexpected character
+                raise ValueError("tree missing")
+    return SgfTree(properties=properties, children=children)
+    # Handled Edge Cases: Unexpected characters in tree structure
+def _parse_subtree(content: str, start_index: int) -> tuple[SgfTree, int]:
+    """
+    Parse a subtree enclosed in parentheses.
+    Args:
+        content: The content to parse
+        start_index: The index where the subtree starts (at the opening parenthesis)
+    Returns:
+        tuple: A tuple containing the parsed SgfTree and the index after the subtree
+    """
+    # Edge Case: Not starting with '('
+    if content[start_index] != '(':
+        raise ValueError("tree missing")
+    # Find the matching closing parenthesis
+    depth = 1
+    index = start_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")
+    # Extract the subtree content
+    subtree_content = content[start_index + 1:index - 1]
+    # Edge Case: Empty subtree
+    if not subtree_content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Subtree not starting with ';'
+    if not subtree_content.startswith(';'):
+        raise ValueError("tree missing")
+    # Parse the subtree
+    tree = _parse_tree(subtree_content)
+    return tree, index
+    # Handled Edge Cases: Not starting with '(', unmatched parentheses, empty subtree, subtree not starting with ';'
+def _parse_properties(content: str, start_index: int) -> tuple[dict, int]:
+    """
+    Parse properties from the content.
+    Args:
+        content: The content to parse
+        start_index: The index to start parsing from
+    Returns:
+        tuple: A tuple containing the parsed properties dictionary and the index after the properties
+    """
+    properties = {}
+    index = start_index
+    while index < len(content) and content[index] not in ['(', ')', ';']:
+        # Parse property key
+        key_start = index
+        # Edge Case: Key not in uppercase
+        if not content[index].isalpha() or not content[index].isupper():
+            raise ValueError("property must be in uppercase")
+        while index < len(content) and content[index].isalpha() and content[index].isupper():
+            index += 1
+        # Edge Case: Key with no value
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        key = content[key_start:index]
+        # Parse property values
+        values = []
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip the opening bracket
+            value_start = index
+            # Parse value
+            while index < len(content):
+                if content[index] == ']':
+                    break
+                elif content[index] == '\\':
+                    # Skip the escape character and the next character
+                    index += 2
+                else:
+                    index += 1
+            # Edge Case: Unclosed value bracket
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            value = content[value_start:index]
+            value = _unescape_text(value)
+            values.append(value)
+            index += 1  # Skip the closing bracket
+        # Edge Case: No values for a property
+        if not values:
+            raise ValueError("properties without delimiter")
+        properties[key] = values
+    return properties, index
+    # Handled Edge Cases: Key not in uppercase, key with no value, unclosed value bracket, no values for a property
+def _unescape_text(text: str) -> str:
+    """
+    Unescape SGF text according to SGF specifications.
+    Args:
+        text: The text to unescape
+    Returns:
+        str: The unescaped text
+    """
+    result = []
+    i = 0
+    while i < len(text):
+        if text[i] == '\\':
+            i += 1  # Skip the escape character
+            if i < len(text):
+                # If the next character is a newline, remove it
+                if text[i] == '\n':
+                    i += 1  # Skip the newline
+                # If the next character is any other whitespace, convert to space
+                elif text[i].isspace():
+                    result.append(' ')
+                    i += 1
+                # Otherwise, insert the character as-is
+                else:
+                    result.append(text[i])
+                    i += 1
+            # Edge Case: Escape character at end of string
+            else:
+                result.append('\\')
+        else:
+            # Convert all whitespace characters (except newline) to spaces
+            if text[i] != '\n' and text[i].isspace():
+                result.append(' ')
+            else:
+                result.append(text[i])
+            i += 1
+    return ''.join(result)
+    # Handled Edge Cases: Escape character at end of string