OpenSavvy Prepared #

Testing frameworks are composed of three different components:

• The assertions check that values are what we expect,
• The structure is the way tests are declared and discovered,
• The runner is the program that executes the tests.

OpenSavvy Prepared is a structure library: it concentrates on the way tests are declared. It is possible to use other libraries (e.g. Kotlin Test, Kotest, Strikt, Atrium…) to declare assertions.

// Declare tests using a regular Kotlin DSL, no annotations or other magic
fun SuiteDsl.showcase() = suite("Showcase Prepared") {
	test("A simple test") {
		// Use Kotest or any other assertion library
		"Hello world" shouldContain "world"
	}

	// Instantiate test data with coroutine-aware builders
	val database by prepared { Database.connect() }
	val minVersion by prepared { Database.minimalVersion.connect() }
	val testDir by createRandomDirectory()

	// Declare nested test suites
	suite("Dump the database") {
		// Declare tests programmatically
		for (db in listOf(database, minVersion)) {
			test("Dump the database ${db.name}") {
				// Each test gets its own instance of all prepared values
				// (here, each test gets its own output directory)
				val outputDir = testDir()

				db().dumpTo(outputDir)
			}
		}
	}

	test("Control the time and randomness") {
		time.set("2023-10-21T21:08:29Z")
		random.setSeed(123)

		val random = testDir / "random.txt"
		val date = testDir / "now.txt"

		// Only values accessed in the test are prepared;
		// here, the 'database' and 'minVersion' values are not created
		random().writeText(random.nextInt())
		date().writeText(time.now().toString())
	}
}

To learn more, read the documentation.

Project structure #

• suite: Utilities to declare tests and describe how they should run
• runners: Compatibility layer for test runners
• compat: Compatibility layer for other libraries

License #

This project is licensed under the Apache 2.0 license.

Contributing #

See CONTRIBUTING.md.

• To learn more about our coding conventions and workflow, see the OpenSavvy website.
• This project is based on the OpenSavvy Playground, a collection of preconfigured project templates.

If you don't want to clone this project on your machine, it is also available using DevContainer (open in VS Code • IntelliJ & JetBrains IDEs). Don't hesitate to create issues if you have problems getting the project up and running.