Finished

Test Name	Status
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_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_properties_without_delimiter	Fail
test_semicolon_in_property_value_doesn_t_need_to_be_escaped	Fail
test_two_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_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_single_node_tree	Pass
test_tree_with_no_nodes	Pass
test_two_child_trees	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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Failed

 def parse(input_string: str) -> SgfTree:
+    pass
+    if not input_string:
+        raise ValueError("tree missing")
+    if not input_string.startswith('(') or not input_string.endswith(')'):
+        raise ValueError("tree missing")
+    # Edge Case: Empty tree with just parentheses
+    if input_string == '()':
+        raise ValueError("tree with no nodes")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    if not content:
+        raise ValueError("tree with no nodes")
+    return parse_tree(content)
+def parse_tree(content: str) -> SgfTree:
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Malformed tree that doesn't start with a semicolon or parenthesis
+    if not content.startswith(';') and not content.startswith('('):
+        raise ValueError("tree missing")
+    nodes, remainder = parse_nodes(content)
+    # Edge Case: Extra content after parsing
+    if remainder:
+        raise ValueError("tree missing")
+    return nodes[0] if nodes else SgfTree()
+# Parse a sequence of nodes and return the first node in the chain
+# Parse a sequence of nodes and return the first node in the chain
+def parse_nodes(content: str) -> tuple[list[SgfTree], str]:
+    if not content:
+        return [], ""
+    # If this is a variation group (starts with parenthesis)
+    if content.startswith('('):
+        nodes = []
+        while content.startswith('('):
+            child_content, content = extract_parenthesized_content(content)
+            child_nodes, _ = parse_nodes(child_content[1:-1])  # Remove parentheses
+            # Only add the first node of each variation
+            if child_nodes:
+                nodes.append(child_nodes[0])
+        return nodes, content
+    # Parse sequential nodes (separated by semicolons)
+    nodes = []
+    while content.startswith(';'):
+        # Parse one node
+        node, content = parse_node(content[1:])  # Skip the semicolon
+        nodes.append(node)
+    # Link sequential nodes as a chain
+    # Each node (except the last) has the next node as its first child
+    for i in range(len(nodes) - 1):
+        nodes[i].children.insert(0, nodes[i + 1])
+    # Check for variations that belong to the first node in the sequence
+    if nodes:
+        children = []
+        while content.startswith('('):
+            child_content, content = extract_parenthesized_content(content)
+            child_nodes, _ = parse_nodes(child_content[1:-1])  # Remove parentheses
+            # Only add the first node of each variation
+            if child_nodes:
+                children.append(child_nodes[0])
+        # Add variations as children of the first node
+        if children:
+            nodes[0].children.extend(children)
+    return nodes, content
+def parse_node(content: str) -> tuple[SgfTree, str]:
+    properties = {}
+    while content:
+        # Skip optional semicolons that separate properties within the same node
+        if content.startswith(';'):
+            content = content[1:]
+            continue
+        # Check if we have a property (alphabetic characters followed by '[')
+        i = 0
+        while i < len(content) and content[i].isalpha():
+            i += 1
+        # If we have alphabetic characters followed by '[', it's a property
+        if i > 0 and i < len(content) and content[i] == '[':
+            # Parse a property
+            key, values, content = parse_property(content)
+            # Edge Case: Property key not in uppercase
+            if not key.isupper():
+                raise ValueError("property must be in uppercase")
+            properties[key] = values
+        else:
+            # No more properties in this node
+            # Stop at semicolon (next node), parenthesis (variation), or end of content
+            break
+    return SgfTree(properties), content
+def parse_property(content: str) -> tuple[str, list[str], str]:
+    # Parse the key
+    key = ""
+    i = 0
+    while i < len(content) and content[i].isalpha():
+        key += content[i]
+        i += 1
+    # Edge Case: Properties without delimiter (no key or no opening bracket)
+    if not key or i >= len(content) or content[i] != '[':
+        raise ValueError("properties without delimiter")
+    # Parse the values
+    values = []
+    i += 1  # Skip the opening bracket
+    while True:
+        value, i = parse_value(content, i)
+        values.append(value)
+        # Check if there's another value for the same key
+        if i < len(content) and content[i] == '[':
+            i += 1  # Skip the opening bracket
+        else:
+            break
+    return key, values, content[i:]
+def parse_value(content: str, start_index: int) -> tuple[str, int]:
+    value = ""
+    i = start_index
+    while i < len(content) and content[i] != ']':
+        if content[i] == '\\':
+            # Handle escape sequences
+            i += 1
+            if i < len(content):
+                # According to SGF spec, any character after \ is inserted as-is
+                # But whitespace other than newline is converted to space
+                char = content[i]
+                if char != '\n' and char.isspace():
+                    value += ' '
+                else:
+                    value += char
+                i += 1
+            else:
+                # Edge Case: Escape character at end of input
+                raise ValueError("properties without delimiter")
+        elif content[i] == '\n':
+            # Edge Case: Newline handling - if immediately after \, remove it
+            # But this case should be handled by the escape check above
+            # If we get here, it's a standalone newline
+            value += content[i]
+            i += 1
+        else:
+            # Convert other whitespace to spaces
+            if content[i] != '\n' and content[i].isspace():
+                value += ' '
+            else:
+                value += content[i]
+            i += 1
+    # Edge Case: Missing closing bracket
+    if i >= len(content) or content[i] != ']':
+        raise ValueError("properties without delimiter")
+    return value, i + 1  # Skip the closing bracket
+def extract_parenthesized_content(content: str) -> tuple[str, str]:
+    if not content.startswith('('):
+        raise ValueError("tree missing")
+    balance = 0
+    for i, char in enumerate(content):
+        if char == '(':
+            balance += 1
+        elif char == ')':
+            balance -= 1
+            if balance == 0:
+                return content[:i+1], content[i+1:]
+    # Edge Case: Unbalanced parentheses
+    raise ValueError("tree missing")