feat(testing): add MVP TOML DSL adapter and test dsl CLI command

[AdityaShome]

Summary

This PR is rebased on #1447 and adds an MVP TOML based testing DSL to the root level tests/ crate and exposes it through a new mofa test-dsl CLI command.

The DSL is intentionally narrow. It is a thin adapter over the existing testing runner and report stack, so contributors can define and execute simple agent test cases without introducing a separate DSL execution framework.

This PR also adds optional report-file output for DSL runs, reusing the existing report types and formatters from the tests/ crate.

What Changed

• Added a minimal TOML DSL in the tests/ crate for simple agent test cases
• Added mofa test-dsl <file> to execute TOML test cases through the existing testing runner
• Added optional report output for DSL runs via --report-out and --report-format {json,text}
• Added example DSL files and focused unit/integration coverage

Files Changed

Core Files

crates/mofa-cli/src/cli.rs

• Added the test-dsl subcommand.
• Added --report-out and --report-format options.
• Added TestDslReportFormat with json and text.

crates/mofa-cli/src/commands/mod.rs

• Exported the new test_dsl command module.

crates/mofa-cli/src/commands/test_dsl.rs

• Implemented the mofa test-dsl command.
• Loads a TOML case, executes it through the tests/ crate, prints a text/JSON summary, and optionally writes a report file using the existing report formatters.

crates/mofa-cli/src/main.rs

• Wired the test-dsl subcommand into CLI dispatch.

tests/src/dsl.rs

• Added the minimal TOML DSL adapter.
• Defines the schema, parses TOML files, configures AgentTestRunner, and validates simple assertions.

tests/src/lib.rs

• Exported the new DSL types and helpers from the tests/ crate.

tests/tests/dsl_tests.rs

• Added coverage for simple DSL execution, bootstrap file support, and tool-backed runs.

Supporting Files

crates/mofa-cli/tests/test_dsl_integration_tests.rs: CLI integration coverage for DSL execution, JSON stdout output, and JSON/text report generation.

tests/examples/simple_agent.toml: Minimal example DSL case with a prompt, mocked LLM response, and text assertion.

tests/examples/bootstrap_agent.toml: DSL example covering bootstrap file loading and prompt bootstrap integration.

tests/examples/tool_agent.toml: Tool-aware example DSL case with agent metadata, mock tool setup, stepped LLM tool calls, and assertions.

DSL Scope

The initial DSL supports:

• prompt or input
• bootstrap files
• agent name/description
• mock tool registration with fixed results
• deterministic LLM responses
• simple stepped LLM flows, including tool calls
• lightweight assertions such as output containment and expected tool call

CLI Usage

Examples:

mofa test-dsl tests/examples/simple_agent.toml
mofa --output-format json test-dsl tests/examples/tool_agent.toml
mofa test-dsl tests/examples/simple_agent.toml --report-out dsl-report.json --report-format json

The command prints a run summary to stdout and can optionally write a structured report file in json or text format.

Flow

flowchart TD
    A[TOML DSL file] --> B[mofa test-dsl]
    B --> C[Parse DSL into TestCaseDsl]
    C --> D[Configure existing AgentTestRunner]
    D --> E[Apply bootstrap files]
    D --> F[Register mock tools]
    D --> G[Queue deterministic LLM responses or steps]
    E --> H[Execute test case]
    F --> H
    G --> H
    H --> I[Collect run result and metadata]
    I --> J[Apply DSL assertions]
    J --> K[Print CLI summary]
    J --> L[Build TestReport]
    L --> M[Optional report file<br/>json or text]

Loading

Example Output

mofa test-dsl tests/examples/simple_agent.toml

case: simple_agent_run
status: passed
output: hello from DSL
duration_ms: 0

Dependency Changes

• Added workspace-level toml dependency for shared TOML parsing
• Added toml to the tests/ crate
• Added the tests/ crate as a dependency of mofa-cli

Tests

• cargo test -p mofa-testing --test dsl_tests
• cargo test -p mofa-cli --test test_dsl_integration_tests

Notes

This keeps the DSL intentionally small and runner backed for now, so future DSL expansion can build on the same execution and reporting path.