Finished

Test Name	Status
test_all_lowercase_property	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_two_nodes	Fail
test_upper_and_lowercase_property	Fail
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_properties_without_delimiter	Pass
test_single_node_tree	Pass
test_tree_with_no_nodes	Pass
test_two_child_trees	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 only whitespace
+    if not input_string or input_string.isspace():
+        raise ValueError("tree missing")
+    # Edge Case: Missing opening parenthesis
+    if not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Missing closing parenthesis
+    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: Missing semicolon after opening parenthesis
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    return _parse_tree_content(content)
+def _parse_tree_content(content: str) -> SgfTree:
+    """
+    Parse the content inside the parentheses of an SGF string.
+    Args:
+        content: The content inside the outer parentheses
+    Returns:
+        SgfTree: A tree structure representing the SGF data
+    """
+    # Skip the initial semicolon
+    index = 1
+    # Parse properties of the current node
+    properties, index = _parse_properties(content, index)
+    # Parse children nodes
+    children = []
+    # Edge Case: Handle multiple variations (children)
+    while index < len(content) and content[index] == '(':
+        # Find the matching closing parenthesis for this child
+        paren_count = 1
+        start = index + 1
+        index += 1
+        while index < len(content) and paren_count > 0:
+            if content[index] == '(':
+                paren_count += 1
+            elif content[index] == ')':
+                paren_count -= 1
+            index += 1
+        # Edge Case: Unmatched parentheses in child
+        if paren_count != 0:
+            raise ValueError("tree missing")
+        # Parse the child content
+        child_content = content[start:index-1]
+        child_tree = _parse_tree_content(child_content)
+        children.append(child_tree)
+    return SgfTree(properties, children)
+def _parse_properties(content: str, start_index: int) -> tuple[dict, int]:
+    """
+    Parse properties from the content string starting at the given index.
+    Args:
+        content: The content string
+        start_index: The index to start parsing from
+    Returns:
+        tuple: A tuple containing the properties dictionary and the next index
+    """
+    properties = {}
+    index = start_index
+    # Edge Case: Parse multiple properties in the same node
+    while index < len(content) and content[index].isalpha() and content[index].isupper():
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isalpha() and content[index].isupper():
+            index += 1
+        key = content[key_start:index]
+        # Edge Case: Property key is not in uppercase
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        # Parse values
+        values = []
+        # Edge Case: Missing opening bracket for property value
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        # Edge Case: Parse multiple values for the same key
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip opening bracket
+            value_start = index
+            # Find the closing bracket
+            bracket_count = 1
+            while index < len(content) and bracket_count > 0:
+                if content[index] == '\\':
+                    index += 2  # Skip escape character and the next character
+                elif content[index] == '[':
+                    bracket_count += 1
+                    index += 1
+                elif content[index] == ']':
+                    bracket_count -= 1
+                    index += 1
+                else:
+                    index += 1
+            # Edge Case: Unmatched brackets
+            if bracket_count != 0:
+                raise ValueError("properties without delimiter")
+            value = content[value_start:index-1]
+            # Process the value according to SGF Text type rules
+            processed_value = _process_text_value(value)
+            values.append(processed_value)
+        properties[key] = values
+    return properties, index
+def _process_text_value(value: str) -> str:
+    """
+    Process a text value according to SGF Text type rules.
+    Args:
+        value: The raw text value
+    Returns:
+        str: The processed text value
+    """
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            # Edge Case: Handle escape sequences
+            i += 1
+            if i < len(value):
+                # According to SGF rules:
+                # - Newlines are removed if they come immediately after a backslash
+                # - All whitespace characters other than newline are converted to spaces
+                # - Any non-whitespace character after \ is inserted as-is
+                if value[i] == '\n':
+                    # Newline immediately after backslash is removed
+                    pass
+                elif value[i].isspace():
+                    # Other whitespace characters are converted to spaces
+                    result.append(' ')
+                else:
+                    # Non-whitespace character is inserted as-is
+                    result.append(value[i])
+                i += 1
+            else:
+                # Edge Case: Backslash at end of string
+                result.append('\\')
+        else:
+            # Edge Case: Convert non-newline whitespace to spaces
+            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, missing delimiters, invalid tree structure, property format errors, escape sequences, whitespace handling
+# Handled Edge Cases: Unmatched parentheses, property parsing, multiple children
+# Handled Edge Cases: Property key validation, bracket matching, multiple values
+# Handled Edge Cases: Escape sequences, whitespace conversion, newline handling