Executing Groovy Test Scripts Dynamically from Java: A Practical Guide

Purpose

This component enables a Java‑based HTTP client test framework to execute test cases written in Groovy. It loads a Groovy source file, creates an instance of the generated class, and invokes selected methods without relying on external build tools.

Design constraints

GroovyClassLoader must be instantiated as a non‑static object; a static loader would share state across executions and break isolation.

File discovery is limited to a single directory (non‑recursive) – recursion can be added later if required.

Core class: ExcuteGroovy

Located in com.fission.source.source, this class extends an abstract SourceCode base and encapsulates all responsibilities for script handling.

Member fields

private String path;

– absolute path of the Groovy script. private String name; – method name to invoke when excuteMethodByName is used. private String[] args; – placeholder for future argument support. private List<String> files = new ArrayList<>(); – collection of discovered .groovy files.

private GroovyClassLoader loader = new GroovyClassLoader(getClass().getClassLoader());

– non‑static loader that uses the current class loader as parent. private GroovyObject groovyObject; – runtime instance of the loaded Groovy class. private Class<?> groovyClass; – the compiled Groovy class.

Construction

The constructor stores path and name, then immediately calls getGroovyObject() to compile the script and instantiate the object.

Primary operations

excuteAllMethod(String path) – discovers all .groovy files under path (non‑recursive) and invokes excuteMethodByPath on each file.

excuteMethodByName() – validates that path points to a file, then calls groovyObject.invokeMethod(name, null). Errors are caught and logged.

excuteMethodByPath() – iterates over groovyClass.getDeclaredMethods(), filters methods whose name contains "test" or equals "main", and invokes them via groovyObject.invokeMethod.

Supporting methods

getGroovyObject()

– parses the Groovy file with loader.parseClass, then creates a new instance via groovyClass.newInstance(). IO, instantiation, and illegal‑access exceptions are logged. getAllFile(String path) – if path is a file, adds it to files; otherwise lists directory entries, adds those ending with .groovy, and returns the list.

Usage example

String scriptPath = "/opt/tests/sample.groovy";
String methodName = "testLogin";
ExcuteGroovy executor = new ExcuteGroovy(scriptPath, methodName);
// Execute only the method named "testLogin"
executor.excuteMethodByName();

// Execute all test‑like methods in the script
executor.excuteMethodByPath();

// Execute every Groovy file in a directory
executor.excuteAllMethod("/opt/tests");

Important notes

The loader is created per ExcuteGroovy instance, ensuring isolation between different test scripts.

Method filtering is deliberately simple (contains "test" or equals "main"); more sophisticated patterns can be added as needed.

Recursive directory traversal is not implemented; extending getAllFile with a depth‑first search would enable full test suite discovery.