Run detekt in unit test

build.gradle

dependencies {
  testImplementation "io.gitlab.arturbosch.detekt:detekt-core:1.0.0.RC9.2"
  testImplementation "io.gitlab.arturbosch.detekt:detekt-rules:1.0.0.RC9.2"
}

StaticAnalysis.kt

package app.package.name

import io.gitlab.arturbosch.detekt.api.Finding
import io.gitlab.arturbosch.detekt.api.YamlConfig
import io.gitlab.arturbosch.detekt.core.DetektFacade
import io.gitlab.arturbosch.detekt.core.ProcessingSettings
import io.gitlab.arturbosch.detekt.rules.providers.*
import org.hamcrest.core.IsEqual
import org.junit.Assert
import org.junit.Test
import java.nio.file.Paths

class StaticAnalysis {
  @Test
  fun detekt() {
    val detektion = DetektFacade.create(
      ProcessingSettings(
        Paths.get("../"),
        YamlConfig.load(Paths.get("./src/test/assets/detekt.yml"))
      ),
      listOf(
        StyleGuideProvider(),
        ComplexityProvider(),
        EmptyCodeProvider(),
        NamingProvider(),
        PerformanceProvider(),
        PotentialBugProvider(),
        CommentSmellProvider(),
        ExceptionsProvider()
      ),
      emptyList()
    ).run()
    val errors = detektion.findings.entries.map { it.value.size }.sum()
    val message = detektion.findings.entries.joinToString("\n") {
      it.value.joinToString("\n", transform = Finding::toString)
    }
    Assert.assertThat(message, errors, IsEqual.equalTo(0))
  }
}