Finished

Test Name	Status
test_escaped_backslash_in_property_value_becomes_just_a_backslash	Fail
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_upper_and_lowercase_property	Fail
test_all_lowercase_property	Pass
test_empty_input	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_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 in SGF format
+    Returns:
+        SgfTree: The parsed SGF tree
+    Raises:
+        ValueError: If the input is invalid according to SGF format rules
+    """
+    # Edge Case: Empty input
+    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")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    # Edge Case: Empty tree
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Parse the tree
+    tree, _ = _parse_tree_with_sequential(content, 0)
+    return tree
+def _parse_tree_with_sequential(content: str, index: int) -> tuple[SgfTree, int]:
+    """
+    Parse a tree from the content string starting at index, handling sequential nodes.
+    Args:
+        content: The SGF content string
+        index: The starting index to parse from
+    Returns:
+        tuple: (SgfTree, new_index)
+    """
+    # Parse the first node
+    tree, index = _parse_tree(content, index)
+    # Parse sequential nodes (parent-child relationships)
+    while index < len(content) and content[index] == ';':
+        child, index = _parse_tree(content, index)
+        tree.children.append(child)
+    return tree, index
+def _parse_tree(content: str, index: int) -> tuple[SgfTree, int]:
+    """
+    Parse a tree from the content string starting at index.
+    Args:
+        content: The SGF content string
+        index: The starting index to parse from
+    Returns:
+        tuple: (SgfTree, new_index)
+    """
+    # Edge Case: Missing semicolon at start of node
+    if index >= len(content) or content[index] != ';':
+        raise ValueError("tree missing")
+    index += 1  # Skip the semicolon
+    # Parse properties of the current node
+    properties = {}
+    while index < len(content) and content[index] not in '();':
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isupper():
+            index += 1
+        # Edge Case: Key is not uppercase
+        if index == key_start:
+            raise ValueError("property must be in uppercase")
+        key = content[key_start:index]
+        # Edge Case: Missing opening bracket for property value
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        # Parse all values for this key
+        values = []
+        # Parse the first value
+        if index < len(content) and content[index] == '[':
+            index += 1  # Skip opening bracket
+            # Parse value, handling escapes
+            value_chars = []
+            while index < len(content):
+                if content[index] == ']':
+                    # Found closing bracket, end of value
+                    break
+                elif content[index] == '\\':
+                    index += 1
+                    if index >= len(content):
+                        raise ValueError("properties without delimiter")
+                    # In SGF, escape the next character as-is
+                    value_chars.append(content[index])
+                else:
+                    value_chars.append(content[index])
+                index += 1
+            # Edge Case: Missing closing bracket
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            value = ''.join(value_chars)
+            # Process value according to SGF text rules
+            processed_value = _process_text_value(value)
+            values.append(processed_value)
+            index += 1  # Skip closing bracket
+            # Parse additional values for the same key (only if they start with [)
+            while index < len(content) and content[index] == '[':
+                index += 1  # Skip opening bracket
+                # Parse value, handling escapes
+                value_chars = []
+                while index < len(content):
+                    if content[index] == ']':
+                        # Found closing bracket, end of value
+                        break
+                    elif content[index] == '\\':
+                        index += 1
+                        if index >= len(content):
+                            raise ValueError("properties without delimiter")
+                        # In SGF, escape the next character as-is
+                        value_chars.append(content[index])
+                    else:
+                        value_chars.append(content[index])
+                    index += 1
+                # Edge Case: Missing closing bracket
+                if index >= len(content) or content[index] != ']':
+                    raise ValueError("properties without delimiter")
+                value = ''.join(value_chars)
+                # Process value according to SGF text rules
+                processed_value = _process_text_value(value)
+                values.append(processed_value)
+                index += 1  # Skip closing bracket
+        properties[key] = values
+    # Parse children
+    children = []
+    while index < len(content) and content[index] == '(':
+        child, index = _parse_tree(content, index + 1)  # Skip opening parenthesis
+        children.append(child)
+        # Skip closing parenthesis
+        if index >= len(content) or content[index] != ')':
+            raise ValueError("tree missing")
+        index += 1
+    return SgfTree(properties, children), index
+def _process_text_value(value: str) -> str:
+    """
+    Process a text value according to SGF text rules.
+    Args:
+        value: The raw text value
+    Returns:
+        str: The processed text value
+    """
+    # Process according to SGF text rules:
+    # 1. Newlines are removed if they come immediately after a `\`
+    # 2. All whitespace characters other than newline are converted to spaces
+    # 3. `\` is the escape character - any character after `\` is inserted as-is
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            # This is an escape character
+            i += 1
+            if i < len(value):
+                # Check if the next character is a newline
+                if value[i] == '\n':
+                    # Remove the newline (skip it)
+                    i += 1
+                else:
+                    # Insert the next character as-is
+                    result.append(value[i])
+                    i += 1
+            # If we're at the end, just ignore the trailing backslash
+        else:
+            # Non-escaped character
+            # Convert all whitespace (except newlines) to spaces
+            if value[i].isspace() and value[i] != '\n':
+                result.append(' ')
+            else:
+                result.append(value[i])
+            i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, missing parentheses, missing semicolon, empty tree, key not uppercase, missing brackets, trailing backslash
+# Handled Edge Cases: Missing semicolon, missing opening bracket, missing closing bracket, key not uppercase
+# Handled Edge Cases: Missing closing parenthesis, missing opening parenthesis