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https://github.com/monix/minitest
The super light testing library for Scala and Scala.js
https://github.com/monix/minitest
laws scala scalacheck testing
Last synced: 6 days ago
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The super light testing library for Scala and Scala.js
- Host: GitHub
- URL: https://github.com/monix/minitest
- Owner: monix
- License: apache-2.0
- Created: 2014-12-16T01:17:08.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2024-08-12T23:45:08.000Z (5 months ago)
- Last Synced: 2024-12-29T17:04:17.895Z (14 days ago)
- Topics: laws, scala, scalacheck, testing
- Language: Scala
- Homepage:
- Size: 785 KB
- Stars: 179
- Watchers: 6
- Forks: 34
- Open Issues: 12
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGES.md
- License: LICENSE
Awesome Lists containing this project
- awesome-scala-native - minitest - Lightweight testing library. (Unit Tests)
- awesome-scala - minitest - activity/y/monix/minitest) (Table of Contents / Testing)
README
# Minitest
A mini testing framework cross-compiled for Scala 2.12, 2.13, 3.0, and [Scala.JS 1.x](http://www.scala-js.org/).
## Usage in SBT
For `build.sbt` (use the `%%%` operator for Scala.js):
```scala
// use the %%% operator for Scala.js
libraryDependencies += "io.monix" %% "minitest" % "2.9.6" % "test"
testFrameworks += new TestFramework("minitest.runner.Framework")
```
In case you want the optional package for integration with the latest
[ScalaCheck](https://www.scalacheck.org/), at the moment of writing
this being version `1.15.4`:
```scala
// use the %%% operator for Scala.js
libraryDependencies += "io.monix" %% "minitest-laws" % "2.9.6" % "test"
```
Given that updates for ScalaCheck have been problematic, the ecosystem
being at the moment of writing using an older version, a "legacy" package
is currently provided for usage with ScalaCheck `1.13.5`:
```scala
// use the %%% operator for Scala.js
libraryDependencies += "io.monix" %% "minitest-laws-legacy" % "2.7.0" % "test"
```
Note that at this time the laws package is not available for Scala
Native, due to ScalaCheck not being available for it.
## Tutorial
Test suites MUST BE objects, not classes. To create a simple test suite, it could
inherit from [SimpleTestSuite](shared/src/main/scala/minitest/SimpleTestSuite.scala):
Here's a simple test:
```scala
import minitest._
object MySimpleSuite extends SimpleTestSuite {
test("should be") {
assertEquals(2, 1 + 1)
}
test("should not be") {
assert(1 + 1 != 3)
}
test("should throw") {
class DummyException extends RuntimeException("DUMMY")
def test(): String = throw new DummyException
intercept[DummyException] {
test()
}
()
}
test("test result of") {
assertResult("hello world") {
"hello" + " " + "world"
}
}
}
```
In case you want to setup an environment for each test and need `setup` and
`tearDown` semantics, per test, you could inherit from
[TestSuite](shared/src/main/scala/minitest/TestSuite.scala). Then on each `test` definition,
you'll receive a fresh value:
```scala
import minitest.TestSuite
object MyTestSuite extends TestSuite[Int] {
def setup(): Int = {
Random.nextInt(100) + 1
}
def tearDown(env: Int): Unit = {
assert(env > 0, "should still be positive")
}
test("should be positive") { env =>
assert(env > 0, "positive test")
}
test("should be lower or equal to 100") { env =>
assert(env <= 100, s"$env > 100")
}
}
```
Some tests require setup and tear down logic to happen only once per test suite
being executed and `TestSuite` supports that as well, but note you should abstain
from doing this unless you really need it, since the per test semantics are much
saner:
```scala
object MyTestSuite extends TestSuite[Int] {
private var system: ActorSystem = _
override def setupSuite(): Unit = {
system = ActorSystem.create()
}
override def tearDownSuite(): Unit = {
TestKit.shutdownActorSystem(system)
system = null
}
}
```
Minitest supports asynchronous results in tests, just use `testAsync` and
return a `Future[Unit]`:
```scala
import scala.concurrent.ExecutionContext.Implicits.global
object MySimpleSuite extends SimpleTestSuite {
testAsync("asynchronous execution") {
val future = Future(100).map(_+1)
for (result <- future) yield {
assertEquals(result, 101)
}
}
}
```
Minitest has integration with [ScalaCheck](https://www.scalacheck.org/).
So for property-based testing:
```scala
import minitest.laws.Checkers
object MyLawsTest extends SimpleTestSuite with Checkers {
test("addition of integers is commutative") {
check2((x: Int, y: Int) => x + y == y + x)
}
test("addition of integers is associative") {
check3((x: Int, y: Int, z: Int) => (x + y) + z == x + (y + z))
}
}
```
All available assertions are described in [minitest.api.Asserts](./shared/src/main/scala/minitest/api/Asserts.scala):
```scala
// Simple boolean testing
assert(value == expected)
// ... and with a message
assert(value == expected, s"value: $value == expected $expected")
// Equality testing
assertEquals(value, expected)
// Tests the result of an entire block of code
assertResult("Hello, World!") {
Seq("Hello", "World").mkString(", ") + "!"
}
// ... and with a hint
assertResult("Hello, World!", "No hello?!?") {
Seq("Hello", "World").mkString(", ") + "!"
}
// Tests that code throws some specific exception
intercept[IllegalStateException] {
// ...
throw new IllegalStateException("boom!")
}
// Tests that a specific piece of code does not compile
assertDoesNotCompile("1.noSuchMethod")
// Tests that compilation fails for a piece of code with
// a specific error message (via regular expression)
assertDoesNotCompile("1.noSuchMethod", ".*?noSuchMethod is not a member of Int")
// Ignores a piece of test, could be conditional
if (isEnvironmentJavaScript) {
ignore("Test not available on top of JavaScript")
}
// Cancels a test — same as ignoring, but slightly different meaning;
// same result though
if (isEnvironmentJavaScript) {
cancel("Test cannot proceed on top of JavaScript")
}
// Fails a test immediately
fail("Boom!")
```
That's all you need to know.
## License
All code in this repository is licensed under the Apache License, Version 2.0.
See [LICENCE](./LICENSE).
Copyright © 2014-2018 by The Minitest Project Developers.