Finished

Test Name	Status
test_escaped_tab_in_property_value_is_converted_to_space	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_child_trees	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_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_properties_without_delimiter	Pass
test_single_node_tree	Pass
test_tree_with_no_nodes	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 containing SGF formatted data
+    Returns:
+        SgfTree: A tree structure representing the SGF data
+    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(')'):
+        # Check if this might be a property without delimiter case
+        if '(' in input_string and ';' in input_string:
+            # Try to parse to see if it's a property without delimiter
+            try:
+                # Remove the outer parentheses
+                content = input_string[1:]
+                if content.startswith(';'):
+                    # Try to parse the properties
+                    node_end = _find_node_end(content, 1)
+                    node_content = content[1:node_end]
+                    _parse_properties(node_content)
+            except ValueError as e:
+                if "properties without delimiter" in str(e):
+                    raise ValueError("properties without delimiter")
+                elif "property must be in uppercase" in str(e):
+                    raise ValueError("property must be in uppercase")
+        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(content)
+def _parse_tree_content(content: str) -> SgfTree:
+    """
+    Parse the content of a tree (without the outer parentheses).
+    Args:
+        content: The content of the tree
+    Returns:
+        SgfTree: A tree structure representing the content
+    """
+    # Find the first node
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    # Parse the first node
+    node_end = _find_node_end(content, 1)
+    node_content = content[1:node_end]
+    properties = _parse_properties(node_content)
+    # Parse children
+    children_content = content[node_end:]
+    children = _parse_children(children_content)
+    return SgfTree(properties, children)
+def _find_node_end(content: str, start: int) -> int:
+    """
+    Find the end position of a node in the content.
+    Args:
+        content: The content to search in
+        start: The start position
+    Returns:
+        int: The end position of the node
+    """
+    i = start
+    while i < len(content):
+        # If we encounter a ';' or '(' or ')', it's the end of the current node
+        if content[i] in [';', '(', ')']:
+            break
+        i += 1
+    return i
+def _parse_properties(content: str) -> dict:
+    """
+    Parse properties from a node content.
+    Args:
+        content: The content of a node
+    Returns:
+        dict: A dictionary of properties
+    Raises:
+        ValueError: If properties are malformed
+    """
+    properties = {}
+    i = 0
+    while i < len(content):
+        # Skip whitespace
+        if content[i].isspace():
+            i += 1
+            continue
+        # Parse key
+        key_start = i
+        while i < len(content) and content[i].isalpha():
+            i += 1
+        # Edge Case: No key found
+        if i == key_start:
+            raise ValueError("properties without delimiter")
+        key = content[key_start:i]
+        # Edge Case: Key is not uppercase
+        if key != key.upper():
+            raise ValueError("property must be in uppercase")
+        # Parse values
+        if i >= len(content) or content[i] != '[':
+            raise ValueError("properties without delimiter")
+        values = []
+        while i < len(content) and content[i] == '[':
+            i += 1  # Skip '['
+            value_start = i
+            # Parse value according to SGF Text type rules
+            value_chars = []
+            while i < len(content) and content[i] != ']':
+                if content[i] == '\\':
+                    # Handle escape character
+                    i += 1
+                    if i < len(content):
+                        if content[i] == '\n':
+                            # Newlines are removed if they come immediately after a '\'
+                            i += 1
+                        else:
+                            # Any character after '\' is inserted as-is
+                            value_chars.append(content[i])
+                            i += 1
+                    else:
+                        # Edge Case: Escape at end of content
+                        raise ValueError("properties without delimiter")
+                else:
+                    # All whitespace characters other than newline are converted to spaces
+                    if content[i].isspace() and content[i] != '\n':
+                        value_chars.append(' ')
+                    else:
+                        value_chars.append(content[i])
+                    i += 1
+            # Edge Case: Unclosed bracket
+            if i >= len(content) or content[i] != ']':
+                raise ValueError("properties without delimiter")
+            value = ''.join(value_chars)
+            values.append(value)
+            i += 1  # Skip ']'
+        properties[key] = values
+    return properties
+def _parse_children(content: str) -> list:
+    """
+    Parse children from content after a node.
+    Args:
+        content: The content after a node
+    Returns:
+        list: A list of child SgfTree objects
+    """
+    children = []
+    i = 0
+    while i < len(content):
+        # Skip whitespace
+        if content[i].isspace():
+            i += 1
+            continue
+        if content[i] == '(':
+            # Find matching parenthesis
+            paren_count = 1
+            start = i + 1
+            i += 1
+            while i < len(content) and paren_count > 0:
+                if content[i] == '(':
+                    paren_count += 1
+                elif content[i] == ')':
+                    paren_count -= 1
+                i += 1
+            # Edge Case: Unmatched parenthesis
+            if paren_count != 0:
+                raise ValueError("tree missing")
+            # Parse the child tree
+            child_content = content[start:i-1]
+            # Edge Case: Empty child content
+            if not child_content:
+                raise ValueError("tree with no nodes")
+            # Edge Case: Child content doesn't start with ';'
+            if not child_content.startswith(';'):
+                raise ValueError("tree missing")
+            child = _parse_tree_content(';' + child_content)
+            children.append(child)
+        elif content[i] == ';':
+            # This is a sequential node, create a child with it and any of its children
+            node_end = _find_node_end(content, i+1)
+            node_content = content[i+1:node_end]
+            properties = _parse_properties(node_content)
+            # Parse any children of this sequential node
+            remaining_content = content[node_end:]
+            remaining_children = _parse_children(remaining_content)
+            # Create a single child node with the properties and any remaining children
+            child = SgfTree(properties, remaining_children)
+            children.append(child)
+            # We've processed the rest of the content, so we're done
+            break
+        else:
+            # Edge Case: Unexpected character
+            raise ValueError("tree missing")
+    return children
+# Handled Edge Cases: Empty input, missing parentheses, missing semicolon, empty content, invalid property format, lowercase properties, unclosed brackets, unmatched parentheses, empty child content, unexpected characters
+# Handled Edge Cases: Empty input, missing parentheses, missing semicolon, empty content after removing parentheses
+# Handled Edge Cases: No key found, key not uppercase, missing opening bracket, unclosed bracket, escape at end of content
+# Handled Edge Cases: Unmatched parenthesis, empty child content, child content not starting with semicolon, unexpected characters