Update CONTRIBUTING

Author: rcosta358

CONTRIBUTING.md

@@ -7,26 +7,38 @@ Thanks for your interest in contributing! This guide covers the essentials.
 - Java 20+
 - Maven 3.6+
 
-## Build & test
+## Build and Run
+
+To build the project, run:
 
 ```bash
-mvn clean install   # build everything
-mvn test            # run the test suite
+mvn clean install
 ```
 
-Run a single test:
+Code formatting runs automatically via `formatter-maven-plugin` during the `validate` phase.
+
+To verify a single file from the CLI, run:
 
 ```bash
-mvn -pl liquidjava-verifier -Dtest=TestExamples#testMultiplePaths test
+./liquidjava path/to/File.java
 ```
 
-Verify a single file from the CLI:
+## Testing
+
+To run all tests, run:
 
 ```bash
-./liquidjava path/to/File.java
+mvn test
 ```
 
-Code formatting runs automatically via `formatter-maven-plugin` during the `validate` phase.
+To run specific tests, run:
+
+```bash
+mvn -pl liquidjava-verifier -Dtest=ExpressionFormatterTest test
+mvn -pl liquidjava-verifier -Dtest=ExpressionSimplifierTest test
+mvn -pl liquidjava-verifier -Dtest=RefinementsParserTest test
+mvn -pl liquidjava-verifier -Dtest=VariableResolverTest test
+```
 
 ## Release