Add an example for running a singular test invocation:

Concerning the change at tremor-rs/tremor-runtime#1283

Signed-off-by: Mordecai Malignatus <mordecai@malignat.us>

community/development/testing.md

@@ -10,10 +10,18 @@ cargo test --all
 
 ## Running Integration Tests
 
+Running all integration tests:
+
 ```bash
 cargo run -p tremor-cli -- test all tremor-cli/tests
 ```
 
+You can also run a singular test or benchmark by referring to the folder:
+
+```bash
+cargo run -p tremor-cli -- test bench ./tremor-cli/tests/bench/specific-benchmark
+```
+
 ## EQC
 
 EQC or 'QuickCheck' is a specification-based testing tool for Erlang supporting a test methodology called property-based testing. Programs are tested by writing properties - preconditions, postconditions and invariants. QuickCheck uses random generation to create constructive ( should pass ) and destructive ( should fail ) tests given the specified properties. This allows suitably defined specifications to cover a far greater set of use cases than would ordinarily be possible to write manually.