Invoke Diffblue Cover to generate unit tests for Java code.

This tool executes the dcover CLI to automatically generate JUnit tests for the specified Java classes, methods, or packages. It supports various configuration options to control the test generation process.

Args: path: Path to the dcover executable. If not provided, searches system PATH and the DIFFBLUE_COVER_CLI environment variable. working_directory: Root directory of the Java project to test. Defaults to the current working directory. dcover_timeout: Maximum execution time in seconds. Defaults to 600. Set to None for no timeout (not recommended). entry_points: List of fully-qualified Java targets (packages, classes, or methods) to generate tests for. Examples: ['com.example.MyClass', 'com.example.MyClass.myMethod']. If None, tests entire project. args: Additional arguments to pass to dcover. Defaults to None. ctx: MCP server context for logging and progress reporting (auto-injected by FastMCP).

Returns: dict: Execution result containing: - return_code (int): Exit code (0 for success) - status (str): "success" if completed without errors - output (str): Complete stdout/stderr from dcover - command (list[str]): The exact command that was executed - working_directory (Path): Directory where command was run

Raises: ToolError: If dcover executable not found, command fails, or timeout exceeded. The error includes the partial output collected before failure.

Note: If DIFFBLUE_COVER_OPTIONS environment variable is set, it overrides all option parameters (batch, skip_verification, etc.) except path, working_directory, timeout, and entry_points.

This tool requires a valid Diffblue Cover license. See:
https://docs.diffblue.com/features/cover-cli/commands-and-arguments#create-tests

Invoke Diffblue Cover to refactor the project (aliased as 'fix-build').

This tool executes the dcover refactor command to apply automated refactorings, such as fixing build issues or adding missing dependencies.

Args: path: Path to the dcover executable. If not provided, searches system PATH and the DIFFBLUE_COVER_CLI environment variable. working_directory: Root directory of the Java project to test. Defaults to the current working directory. dcover_timeout: Maximum execution time in seconds. Defaults to 600. Set to None for no timeout (not recommended). dry_run: If True, passes the '--dry-run' flag to check for readiness without applying changes. args: Additional arguments to pass to dcover. Defaults to None. ctx: MCP server context for logging and progress reporting (auto-injected by FastMCP).

Returns: dict: Execution result containing: - return_code (int): Exit code (0 for success) - status (str): "success" if completed without errors - output (str): Complete stdout/stderr from dcover - command (list[str]): The exact command that was executed - working_directory (Path): Directory where command was run

Raises: ToolError: If dcover executable not found, command fails, or timeout exceeded. The error includes the partial output collected before failure.

Invoke Diffblue Cover to identify project issues.

This tool executes the dcover issues command to output a prioritized list of project issues that may prevent test generation.

Args: path: Path to the dcover executable. If not provided, searches system PATH and the DIFFBLUE_COVER_CLI environment variable. working_directory: Root directory of the Java project to test. Defaults to the current working directory. dcover_timeout: Maximum execution time in seconds. Defaults to 600. Set to None for no timeout (not recommended). limit: Limit the number of issues to output. skip: Skip the first N issues from the report. prompt: If True, outputs a suggested prompt for each actionable issue. cover_json: Location of the JSON-formatted test-writing summary report. dry_run: If True, passes the '--dry-run' flag to check for readiness. args: Additional arguments to pass to dcover. Defaults to None. ctx: MCP server context for logging and progress reporting (auto-injected by FastMCP).

Returns: dict: Execution result containing: - return_code (int): Exit code (0 for success) - status (str): "success" if completed without errors - output (str): Complete stdout/stderr from dcover - command (list[str]): The exact command that was executed - working_directory (Path): Directory where command was run

Raises: ToolError: If dcover executable not found, command fails, or timeout exceeded. The error includes the partial output collected before failure.