chore(tool): tests for code coverage tool

Author: yashverma2110

README.md

@@ -328,7 +328,9 @@ If you run into any issues, checkout our [troubleshooting guide](./docs/troubles
 - **Emulation** (2 tools)
   - [`emulate`](docs/tool-reference.md#emulate)
   - [`resize_page`](docs/tool-reference.md#resize_page)
-- **Performance** (3 tools)
+- **Performance** (5 tools)
+  - [`coverage_start`](docs/tool-reference.md#coverage_start)
+  - [`coverage_stop`](docs/tool-reference.md#coverage_stop)
   - [`performance_analyze_insight`](docs/tool-reference.md#performance_analyze_insight)
   - [`performance_start_trace`](docs/tool-reference.md#performance_start_trace)
   - [`performance_stop_trace`](docs/tool-reference.md#performance_stop_trace)