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junit5-modular-world

The project layout structure and command line tools usages are based on proposals introduced by the Module System Quick-Start Guide. Invoke the jshell script ./build.jsh (Windows: jshell build.jsh) to build this sample project.

This sample project does not aim to demonstrate how to use the JUnit Platform APIs. For detailed information on the JUnit Platform programming and extension models, please consult the User Guide.

Source Layout

This project hosts three main modules with their associated test modules. Their names are com.example.application, com.example.tool and ice.cream.

In addition to the main modules there's a test module named black.box. It tests the exported packages and types of the main modules.

junit5-modular-world/src

Binary Layout

Main binaries are compiled and packaged using ./compile.jsh.

For example, here are the commands to compile and package the com.example.tool module. This and the com.example.application module don't need external module dependencies.

javac
    -d bin/main
    --module-source-path src/main
    --module com.example.tool

jar
    --create
    --file bin/main-jars/com.example.tool.jar
    -C bin/main/com.example.tool
    .

The ice.cream modules needs external modules to compile and is packaged with an explicit module version:

javac
    -d bin/main
    --module-path lib
    --module-source-path src/main
    --module ice.cream

jar
    --create
    --file bin/main-jars/ice.cream.jar
    --module-version 47.11
    -C bin/main/ice.cream
    .

Here is the partly expanded tree of the bin/ directory after running ./compile.jsh:

junit5-modular-world/bin

Running Tests

Compiling and running tests is achieved by calling the following test scripts:

  • test-classpath.jsh
  • test-patch-compile.jsh
  • test-patch-runtime.jsh
╷
├─ JQwik Test Engine ✔
│  └─ JQwikTests ✔
│     ├─ exampleFor1And3Equals4 ✔
│     └─ propertyAdd ✔
│           2018-03-06T09:39:40.606157
│              tries = `1000`
│              checks = `1000`
│              seed = `-3387297467304298077`
├─ JUnit Vintage ✔
│  └─ black.box.GoodOldTest ✔
│     └─ eighteenEqualsNineAndNine ✔
├─ JUnit Jupiter ✔
│  ├─ black.box/black.box.BlackBoxTests ✔
│  │  ├─ moduleName() ✔
│  │  ├─ add(RepetitionInfo) ✔
│  │  │  ├─ 1 + 5 ✔
│  │  │  ├─ 2 + 5 ✔
│  │  │  ├─ 3 + 5 ✔
│  │  │  ├─ 4 + 5 ✔
│  │  │  └─ 5 + 5 ✔
│  │  └─ packageName() ✔
│  ├─ com.example.application/com.example.application.MainTests ✔
│  │  ├─ simpleName() ✔
│  │  └─ main() ✔
│  ├─ com.example.tool/com.example.tool.CalculatorTests ✔
│  │  ├─ add() ✔
│  │  ├─ mul() ✔
│  │  └─ pow() ✔
│  ├─ FlavorTests ✔
│  │  └─ random() ✔
│  └─ MachineTests ✔
│     ├─ id() ✔
│     └─ caption() ✔
└─ Ice Cream Machine 47.11 (ice.cream) ✔
   ├─ Stracciatella ✔
   ├─ Stracciatella ✔
   ├─ Chocolate ✔
   ├─ Vanilla ✔
   └─ Stracciatella ✔

Ice Cream Test Engine

The ice.cream module demonstrates how to write and register your own TestEngine implementation using the Java Platform Module System. This engine does not find any tests in containers, but discovers a configurable amount of ice cream scoops.

Module Descriptor of the Ice-Cream-Machine

Let's start with the ice.cream module descriptor module-info.java:

module ice.cream {
	requires org.junit.platform.engine;

	provides org.junit.platform.engine.TestEngine with ice.cream.Machine;
}

Implementation of the Ice-Cream-Machine

Here's the outline of the TestEngine implementation:

package ice.cream;

public class Machine implements TestEngine {

	@Override
	public String getId() {
		return "ice-cream-machine";
	}

	@Override
	public TestDescriptor discover(EngineDiscoveryRequest discoveryRequest, UniqueId uniqueId) {
		...generate Scoops, i.e. TestDescriptors.
	}

	@Override
	public void execute(ExecutionRequest request) {
		..."run" Scoops. Tell engine execution listener what we're doing.
	}
}

See classes in package ice.cream for implementation details.

Running the Ice-Cream-Machine

Sample command line to register and execute the ice.cream machine:

java
	-Dscoops=3
	--module-path ...
	--add-modules ALL-MODULE-PATH
	--module org.junit.platform.console
	--scan-modules

The standard output could read like this:

╷
└─ Ice Cream Machine 47.11 (ice.cream) ✔
   ├─ Stracciatella ✔
   ├─ Stracciatella ✔
   └─ Vanilla ✔