Finished

Test Name	Status
test_tree_with_no_nodes	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_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 (Smart Game Format) string and return a tree structure of properties.
+    Args:
+        input_string: A string containing SGF formatted data
+    Returns:
+        SgfTree: A tree structure representing the parsed SGF data
+    Raises:
+        ValueError: If the input string is invalid SGF format
+    """
+    # Edge Case: Empty input or doesn't start with '('
+    if not input_string or input_string[0] != '(':
+        raise ValueError("tree missing")
+    # Edge Case: Doesn't end with ')' - but check if it's just "(" which should be "tree with no nodes"
+    if input_string[-1] != ')':
+        if input_string == "(":  # Special case: just opening parenthesis
+            raise ValueError("tree with no nodes")
+        else:
+            raise ValueError("tree missing")
+    # Edge Case: Only parentheses with no content - this is "tree missing" not "tree with no nodes"
+    if len(input_string) <= 2:
+        raise ValueError("tree missing")
+    # Remove outer parentheses
+    content = input_string[1:-1]
+    return _parse_tree(content)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse the content inside the outer parentheses of an SGF string.
+    Args:
+        content: SGF content without outer parentheses
+    Returns:
+        SgfTree: Parsed tree structure
+    """
+    # Edge Case: Empty content after removing parentheses
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Doesn't start with semicolon (node marker)
+    if content[0] != ';':
+        raise ValueError("tree with no nodes")
+    i = 1  # Skip the initial semicolon
+    properties = {}
+    children = []
+    # Parse properties of the current node
+    while i < len(content) and content[i] != '(' and content[i] != ';':
+        # Parse property 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() or not key.isalpha():
+            raise ValueError("property must be in uppercase")
+        # Parse property values
+        values = []
+        # Edge Case: No values after key
+        if i >= len(content) or content[i] != '[':
+            raise ValueError("properties without delimiter")
+        while i < len(content) and content[i] == '[':
+            i += 1  # Skip '['
+            value_start = i
+            # Parse value, handling escapes
+            while i < len(content) and content[i] != ']':
+                if content[i] == '\\':
+                    i += 2  # Skip escape character and the escaped character
+                else:
+                    i += 1
+            # Edge Case: Unclosed value bracket
+            if i >= len(content):
+                raise ValueError("properties without delimiter")
+            value = content[value_start:i]
+            value = _unescape_value(value)
+            values.append(value)
+            i += 1  # Skip ']'
+        properties[key] = values
+    # Parse children - handle both variations (in parentheses) and sequential nodes (with semicolons)
+    while i < len(content):
+        if content[i] == '(':
+            # Find matching closing parenthesis for variation
+            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")
+            # Extract child content (excluding the closing parenthesis)
+            child_content = content[start:i-1]
+            children.append(_parse_tree(child_content))
+        elif content[i] == ';':
+            # Handle sequential node - create a new node with properties that follow
+            # For sequential nodes, we need to parse just the next node, not the rest
+            # This is a bit tricky - we need to find where this sequential node ends
+            # It ends when we hit another '(' or ';' or the end of content
+            node_end = i + 1
+            while node_end < len(content) and content[node_end] != '(' and content[node_end] != ';':
+                node_end += 1
+            # Parse just this node
+            node_content = content[i:node_end]
+            children.append(_parse_tree(node_content))
+            # Move to the end of this node
+            i = node_end
+            continue
+        else:
+            i += 1
+    return SgfTree(properties, children)
+def _unescape_value(value: str) -> str:
+    """
+    Process escape sequences in SGF text values according to SGF specification.
+    Args:
+        value: Raw SGF text value
+    Returns:
+        str: Processed text value
+    """
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            # Edge Case: Escape at end of string
+            if i + 1 >= len(value):
+                result.append('\\')
+                break
+            next_char = value[i + 1]
+            # Handle newline removal after backslash
+            if next_char == '\n':
+                # Skip the backslash and newline
+                i += 2
+                continue
+            # For escaped whitespace, convert to space (except newline)
+            if next_char.isspace() and next_char != '\n':
+                result.append(' ')
+                i += 2
+            else:
+                # Insert non-whitespace character as-is
+                result.append(next_char)
+                i += 2
+        else:
+            # Convert unescaped whitespace characters (except newlines) to spaces
+            if value[i].isspace() and value[i] != '\n':
+                result.append(' ')
+            else:
+                # Keep all other characters as they are
+                result.append(value[i])
+            i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis,
+#                     only parentheses with no content, empty content after removing parentheses,
+#                     missing semicolon at node start, no key found, key not uppercase,
+#                     no values after key, unclosed value bracket, unmatched parenthesis,
+#                     escape at end of string