Finished

Test Name	Status
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all	Fail
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	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_t_and_n_in_property_value_are_just_letters_not_whitespace	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_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_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(')'):
+        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")
+    # Parse the tree
+    tree, remaining = _parse_tree(content)
+    # Edge Case: If there's remaining content after parsing, it's invalid
+    if remaining:
+        raise ValueError("tree missing")
+    return tree
+def _parse_tree(content: str) -> tuple[SgfTree, str]:
+    """
+    Parse a tree from the content string.
+    Args:
+        content: String content to parse
+    Returns:
+        tuple: (SgfTree, remaining_content)
+    """
+    # Edge Case: Content doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree with no nodes")
+    content = content[1:]  # Remove the ';'
+    # Parse properties
+    properties, content = _parse_properties(content)
+    children = []
+    # Parse children - handle both sequential nodes (;) and variations (())
+    while content:
+        if content.startswith('('):
+            # Handle variations in parentheses
+            child, content = _parse_tree_in_parentheses(content)
+            children.append(child)
+        elif content.startswith(';'):
+            # Handle sequential nodes
+            child, content = _parse_tree(content)
+            children.append(child)
+        else:
+            # No more children
+            break
+    return SgfTree(properties=properties, children=children), content
+def _parse_tree_in_parentheses(content: str) -> tuple[SgfTree, str]:
+    """
+    Parse a tree that's enclosed in parentheses.
+    Args:
+        content: String content starting with '('
+    Returns:
+        tuple: (SgfTree, remaining_content)
+    """
+    # Edge Case: Content doesn't start with '('
+    if not content.startswith('('):
+        raise ValueError("tree missing")
+    content = content[1:]  # Remove the '('
+    tree, remaining = _parse_tree(content)
+    # Edge Case: No closing parenthesis
+    if not remaining.startswith(')'):
+        raise ValueError("tree missing")
+    return tree, remaining[1:]  # Remove the ')'
+def _parse_properties(content: str) -> tuple[dict, str]:
+    """
+    Parse properties from the content string.
+    Args:
+        content: String content to parse properties from
+    Returns:
+        tuple: (properties_dict, remaining_content)
+    """
+    properties = {}
+    while content and content[0].isalpha():
+        # Parse key
+        key_end = 0
+        while key_end < len(content) and content[key_end].isalpha():
+            key_end += 1
+        key = content[:key_end]
+        content = content[key_end:]
+        # Edge Case: Property key is not uppercase
+        if key != key.upper():
+            raise ValueError("property must be in uppercase")
+        # Edge Case: No values for the property
+        if not content.startswith('['):
+            raise ValueError("properties without delimiter")
+        values = []
+        # Parse values
+        while content.startswith('['):
+            content = content[1:]  # Remove the '['
+            value, content = _parse_value(content)
+            # Edge Case: No closing ']' for value
+            if not content.startswith(']'):
+                raise ValueError("properties without delimiter")
+            content = content[1:]  # Remove the ']'
+            values.append(value)
+        properties[key] = values
+    return properties, content
+def _parse_value(content: str) -> tuple[str, str]:
+    """
+    Parse a value from the content string, handling SGF text escaping rules.
+    Args:
+        content: String content to parse value from
+    Returns:
+        tuple: (parsed_value, remaining_content)
+    """
+    result = []
+    i = 0
+    while i < len(content):
+        char = content[i]
+        if char == ']':
+            # End of value
+            break
+        elif char == '\\':
+            # Escape character
+            i += 1
+            if i >= len(content):
+                # Edge Case: Escape character at end of content
+                result.append('\\')
+                break
+            next_char = content[i]
+            if next_char == '\n':
+                # Newline immediately after \ is removed
+                # But if there's content before and after, add a space
+                if result and i + 1 < len(content) and content[i + 1] != ']':
+                    result.append(' ')
+            elif next_char.isspace() and next_char != '\n':
+                # Other whitespace after \ is converted to space
+                result.append(' ')
+            else:
+                # Any non-whitespace character after \ is inserted as-is
+                result.append(next_char)
+        elif char.isspace() and char != '\n':
+            # All whitespace characters other than newline are converted to spaces
+            result.append(' ')
+        elif char == '\n':
+            # Newlines remain as newlines unless immediately after \
+            result.append(char)
+        else:
+            result.append(char)
+        i += 1
+    return ''.join(result), content[i:]
+# Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis, empty content after parentheses removal, missing semicolon, property key not uppercase, missing property delimiter, missing closing bracket for value, escape character at end of content
+# Handled Edge Cases: Missing opening parenthesis for child tree, missing closing parenthesis for child tree, remaining content after parsing
+# Handled Edge Cases: Property key not uppercase, missing property delimiter, missing closing bracket for value
+# Handled Edge Cases: Escape character at end of content, special handling for \n, whitespace conversion rules, newlines removal after \