Add Spek integration

[villelaitila]

Most of the extending functionality is from this issue explaining how to extend Spek: spekframework/spek#115

The integration happens by injecting KoinComponent to Spec class. This enables Koin DSL to be used within Spek tests. KoinSpek.kt adds AutoCloseKoinSpek class similar to AutoCloseKoinTest class.

Usage

Add koin-spek as dependency, e.g.

    testCompile "org.koin:koin-spek:$koin_version"

Switch Spek class to KoinSpek (or AutoCloseKoinSpek) and write the tests normally. Here is minimal example:

class HelloService

val module = applicationContext {
    bean { HelloService() }
}

class KoinDSLTest : AutoCloseKoinSpek({
    describe("DSL") {
        it("is possible to use inject") {
            StandAloneContext.startKoin(listOf(module))

            val helloService: HelloService by inject()
            Assert.assertNotNull(helloService)
        }
    }
})

KoinDSLTest.kt contains the full example.

Spek requires quite a bit of runtime dependencies that are not needed on compile time. I'm not sure whether it is feasible to include in build.gradle file or not. If not, I'm happy to take the tests away.

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