Finished

Test Name	Status
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_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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Passed

 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 malformed or doesn't follow 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")
+    # Parse the content inside the outermost parentheses
+    content = input_string[1:-1]
+    # Edge Case: Empty tree with no nodes
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Content doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree with no nodes")
+    return _parse_tree(content)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse a tree from its content string.
+    Args:
+        content: The content of the tree (without outer parentheses)
+    Returns:
+        SgfTree: The parsed tree
+    """
+    # Edge Case: Empty content
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Content doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree with no nodes")
+    # Find the end of the current node's properties
+    i = 1  # Skip the initial ';'
+    properties = {}
+    # 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: Property key is not in uppercase
+        key = content[key_start:i]
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        # Edge Case: No property values
+        if i >= len(content) or content[i] != '[':
+            raise ValueError("properties without delimiter")
+        # Parse property 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
+                    # Count consecutive backslashes immediately before this position
+                    backslash_count = 0
+                    j = i - 1
+                    while j >= value_start and content[j] == '\\':
+                        backslash_count += 1
+                        j -= 1
+                    # If odd number of backslashes, this ] is escaped
+                    if backslash_count % 2 == 1:
+                        i += 1  # Skip the escaped ] and continue
+                    else:
+                        break  # This is the real closing bracket
+                elif content[i] == '\\':
+                    i += 1  # Skip escape character
+                    if i < len(content):
+                        i += 1  # Skip the escaped character
+                else:
+                    i += 1
+            # Edge Case: Unclosed property value
+            if i >= len(content) or content[i] != ']':
+                raise ValueError("properties without delimiter")
+            value = content[value_start:i]
+            values.append(_unescape_value(value))
+            i += 1  # Skip ']'
+        properties[key] = values
+        # Continue parsing if the next character is another property (alphabetic)
+        # This handles consecutive properties like A[...]B[...]
+        if i < len(content) and content[i].isalpha():
+            continue
+        else:
+            # Break if we encounter a structural element
+            break
+    # Parse children
+    children = []
+    # Handle multiple children
+    while i < len(content) and 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: Mismatched parentheses
+        if paren_count != 0:
+            raise ValueError("tree missing")
+        # Parse the child tree
+        child_content = content[start:i-1]
+        children.append(_parse_tree(child_content))
+    # Handle single child sequence (shorthand notation)
+    if i < len(content) and content[i] == ';':
+        # Parse the rest as a single child
+        child_content = content[i:]
+        children.append(_parse_tree(child_content))
+    return SgfTree(properties, children)
+def _unescape_value(value: str) -> str:
+    """
+    Unescape an SGF text value according to SGF specification.
+    Args:
+        value: The escaped SGF text value
+    Returns:
+        str: The unescaped value
+    """
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            i += 1
+            if i < len(value):
+                # If next character is newline, remove both \ and newline
+                if value[i] == '\n':
+                    i += 1
+                else:
+                    # Any non-whitespace character after \ is inserted as-is
+                    # Any whitespace character after \ is converted to space
+                    if value[i].isspace() and value[i] != '\n':
+                        result.append(' ')
+                        i += 1
+                    else:
+                        result.append(value[i])
+                        i += 1
+            else:
+                # Handle trailing backslash
+                result.append('\\')
+        else:
+            # All whitespace characters other than newline are converted 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, Input doesn't start with '(', Input doesn't end with ')',
+# Empty tree with no nodes, Content doesn't start with ';', Property key is not in uppercase,
+# No property values, Unclosed property value, Mismatched parentheses