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 (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 SGF data
+    Raises:
+        ValueError: If the input string is malformed or doesn't conform to SGF format
+    """
+    # Edge Case: Empty input string
+    if not input_string:
+        raise ValueError("tree missing")
+    # Edge Case: Input doesn't start with '('
+    if not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Input doesn't end with ')'
+    if not input_string.endswith(')'):
+        raise ValueError("tree missing")
+    # Edge Case: Input is just parentheses with no content
+    if input_string == "()":
+        raise ValueError("tree with no nodes")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    # Edge Case: Content is empty after removing parentheses
+    if not content:
+        raise ValueError("tree with no nodes")
+    return _parse_tree(content)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse the content of a tree (without the outer parentheses).
+    """
+    # Edge Case: Content doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    # Find the first node and any subsequent variations
+    i = 1  # Skip the initial ';'
+    # Parse the first node's properties
+    properties, i = _parse_properties(content, i)
+    # Parse children (if any)
+    children = []
+    # Look for variations (subtrees in parentheses)
+    while i < len(content):
+        if content[i] == '(':
+            # Find matching closing 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 subtree
+            subtree_content = content[start:i-1]
+            children.append(_parse_tree(subtree_content))
+        elif content[i] == ';':
+            # Another node in the same sequence
+            node_properties, i = _parse_properties(content, i + 1)
+            # Create a new node and make it a child of the last child (chain)
+            new_node = SgfTree(node_properties, [])
+            if children:
+                # Add to the last child's children to create a chain
+                last_child = children[-1]
+                while last_child.children:
+                    last_child = last_child.children[-1]
+                last_child.children.append(new_node)
+            else:
+                # No existing children, add as direct child
+                children.append(new_node)
+        else:
+            # Unexpected character
+            raise ValueError("tree missing")
+    return SgfTree(properties, children)
+def _parse_properties(content: str, start_index: int) -> tuple[dict, int]:
+    """
+    Parse properties from a node.
+    Returns:
+        Tuple of (properties_dict, next_index)
+    """
+    properties = {}
+    i = start_index
+    # Parse properties while we're not at the end or a special character
+    while i < len(content) and content[i] not in '();':
+        # Parse property key
+        key_start = i
+        # Edge Case: Key is not uppercase
+        if not content[i].isalpha() or not content[i].isupper():
+            raise ValueError("property must be in uppercase")
+        while i < len(content) and content[i].isalpha() and content[i].isupper():
+            i += 1
+        # Edge Case: Key with no values
+        if i >= len(content) or content[i] != '[':
+            raise ValueError("properties without delimiter")
+        key = content[key_start:i]
+        # Parse values
+        values = []
+        while i < len(content) and content[i] == '[':
+            i += 1  # Skip '['
+            value_start = i
+            # Parse value, handling escapes
+            while i < len(content):
+                if content[i] == ']':
+                    # Check if this ] is escaped by counting backslashes before it
+                    backslash_count = 0
+                    j = i - 1
+                    while j >= value_start and content[j] == '\\':
+                        backslash_count += 1
+                        j -= 1
+                    # If even number of backslashes, the ] is NOT escaped
+                    if backslash_count % 2 == 0:
+                        break  # Found unescaped closing bracket
+                    # If odd number of backslashes, the ] is escaped, continue parsing
+                i += 1
+            # Edge Case: Unmatched bracket
+            if i >= len(content):
+                raise ValueError("properties without delimiter")
+            value = _unescape_text(content[value_start:i])
+            values.append(value)
+            i += 1  # Skip ']'
+        # Edge Case: No values for a property
+        if not values:
+            raise ValueError("properties without delimiter")
+        properties[key] = values
+    return properties, i
+def _unescape_text(text: str) -> str:
+    """
+    Process escape sequences in SGF text according to SGF specification.
+    """
+    result = []
+    i = 0
+    while i < len(text):
+        if text[i] == '\\':
+            i += 1  # Skip the backslash
+            # Edge Case: Backslash at end of text
+            if i >= len(text):
+                # According to SGF spec, trailing backslash is just ignored
+                break
+            char = text[i]
+            # Handle newline removal after backslash
+            if char == '\n':
+                # Newline is removed if immediately after backslash
+                pass
+            else:
+                # All other characters after backslash are inserted as-is
+                # All whitespace (except newline) is converted to space
+                if char.isspace() and char != '\n':
+                    result.append(' ')
+                else:
+                    result.append(char)
+        else:
+            char = text[i]
+            # All whitespace characters other than newline are converted to spaces
+            if char.isspace() and char != '\n':
+                result.append(' ')
+            else:
+                result.append(char)
+        i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input string, Input doesn't start with '(', Input doesn't end with ')', Input is just parentheses with no content, Content is empty after removing parentheses, Content doesn't start with ';', Unmatched parenthesis, Key is not uppercase, Key with no values, Unmatched bracket, No values for a property, Backslash at end of text