多亏了KotlinSlack频道的一些帮助，我终于能够弄明白了。首先我必须升级到Gradle版本4. 10. 2。
有关详细信息，请查看Gradle的以下两页：

• https://docs.gradle.org/release-nightly/userguide/organizing_gradle_projects.html#sec:separate_test_type_source_files
• https://docs.gradle.org/release-nightly/userguide/organizing_gradle_projects.html#sec:separate_test_type_source_files

然后，我只需为integrationTests创建源集

sourceSets {
    create("integrationTest") {
            kotlin.srcDir("src/integrationTest/kotlin")
            resources.srcDir("src/integrationTest/resources")
            compileClasspath += sourceSets["main"].output + configurations["testRuntimeClasspath"]
            runtimeClasspath += output + compileClasspath + sourceSets["test"].runtimeClasspath
    }
}

这对于Java来说很好，但是由于我使用的是Kotlin，所以必须添加一个额外的withConvention Package 器

sourceSets {
    create("integrationTest") {
        withConvention(KotlinSourceSet::class) {
            kotlin.srcDir("src/integrationTest/kotlin")
            resources.srcDir("src/integrationTest/resources")
            compileClasspath += sourceSets["main"].output + configurations["testRuntimeClasspath"]
            runtimeClasspath += output + compileClasspath + sourceSets["test"].runtimeClasspath
        }
    }
}

在文档中，他们只放置了runtimeClasspath += output + compileClasspath，但我添加了sourceSets["test"].runtimeClasspath，这样我就可以直接使用测试依赖项，而不是为integrationTest任务声明新的依赖项。
一旦创建了sourceSet，就需要声明一个新任务

task<Test>("integrationTest") {
    description = "Runs the integration tests"
    group = "verification"
    testClassesDirs = sourceSets["integrationTest"].output.classesDirs
    classpath = sourceSets["integrationTest"].runtimeClasspath
    mustRunAfter(tasks["test"])
}

在此之后，测试仍然没有运行，但这是因为我使用的是JUnit4。因此，我只需要添加useJUnitPlatform()，这将使其成为最终代码

task<Test>("integrationTest") {
    description = "Runs the integration tests"
    group = "verification"
    testClassesDirs = sourceSets["integrationTest"].output.classesDirs
    classpath = sourceSets["integrationTest"].runtimeClasspath
    mustRunAfter(tasks["test"])
    useJUnitPlatform()
}

我不喜欢withConvention的使用，也不喜欢Kotlinsrc目录的设置方式，所以在查看了这里和这里的两个gradle文档后，我得出了以下结论：

sourceSets {
    create("integrationTest") {
        kotlin {
            compileClasspath += main.get().output + configurations.testRuntimeClasspath
            runtimeClasspath += output + compileClasspath
        }
    }
}

val integrationTest = task<Test>("integrationTest") {
    description = "Runs the integration tests"
    group = "verification"
    testClassesDirs = sourceSets["integrationTest"].output.classesDirs
    classpath = sourceSets["integrationTest"].runtimeClasspath
    mustRunAfter(tasks["test"])
}

tasks.check {
    dependsOn(integrationTest)
}

在使用kotlin {和使用变量进行新的integrationTestTask时，我更喜欢不那么冗长的风格。

从Gradle 5.2.1开始，请访问https://docs.gradle.org/current/userguide/java_testing.html#sec:configuring_java_integration_tests

sourceSets {
    create("intTest") {
        compileClasspath += sourceSets.main.get().output
        runtimeClasspath += sourceSets.main.get().output
    }
}

val intTestImplementation by configurations.getting {
    extendsFrom(configurations.testImplementation.get())
}

configurations["intTestRuntimeOnly"].extendsFrom(configurations.runtimeOnly.get())

dependencies {
    intTestImplementation("junit:junit:4.12")
}

val integrationTest = task<Test>("integrationTest") {
    description = "Runs integration tests."
    group = "verification"

    testClassesDirs = sourceSets["intTest"].output.classesDirs
    classpath = sourceSets["intTest"].runtimeClasspath
    shouldRunAfter("test")
}

tasks.check { dependsOn(integrationTest) }

下面是你可以参考的git repo：enter link description here

import org.gradle.api.tasks.testing.logging.TestExceptionFormat
import org.gradle.api.tasks.testing.logging.TestLogEvent

plugins {
    application
    kotlin("jvm") version "1.3.72"
    id("com.diffplug.gradle.spotless") version "3.24.2"
    id("org.jmailen.kotlinter") version "1.26.0"
    checkstyle
}

version = "1.0.2"
group = "org.sample"

application {
    mainClass.set("org.sample.MainKt")
}

repositories {
    mavenCentral()
    jcenter()
}

tasks.checkstyleMain { group = "verification" }
tasks.checkstyleTest { group = "verification" }

spotless {
    kotlin {
        ktlint()
    }
    kotlinGradle {
        target(fileTree(projectDir).apply {
            include("*.gradle.kts")
        } + fileTree("src").apply {
            include("**/*.gradle.kts")
        })
        ktlint()
    }
}

tasks.withType<Test> {
    useJUnitPlatform()
    testLogging {
        lifecycle {
            events = mutableSetOf(TestLogEvent.FAILED, TestLogEvent.PASSED, TestLogEvent.SKIPPED)
            exceptionFormat = TestExceptionFormat.FULL
            showExceptions = true
            showCauses = true
            showStackTraces = true
            showStandardStreams = true
        }
        info.events = lifecycle.events
        info.exceptionFormat = lifecycle.exceptionFormat
    }

    val failedTests = mutableListOf<TestDescriptor>()
    val skippedTests = mutableListOf<TestDescriptor>()
    addTestListener(object : TestListener {
        override fun beforeSuite(suite: TestDescriptor) {}
        override fun beforeTest(testDescriptor: TestDescriptor) {}
        override fun afterTest(testDescriptor: TestDescriptor, result: TestResult) {
            when (result.resultType) {
                TestResult.ResultType.FAILURE -> failedTests.add(testDescriptor)
                TestResult.ResultType.SKIPPED -> skippedTests.add(testDescriptor)
                else -> Unit
            }
        }

        override fun afterSuite(suite: TestDescriptor, result: TestResult) {
            if (suite.parent == null) { // root suite
                logger.lifecycle("----")
                logger.lifecycle("Test result: ${result.resultType}")
                logger.lifecycle(
                        "Test summary: ${result.testCount} tests, " +
                                "${result.successfulTestCount} succeeded, " +
                                "${result.failedTestCount} failed, " +
                                "${result.skippedTestCount} skipped")
                failedTests.takeIf { it.isNotEmpty() }?.prefixedSummary("\tFailed Tests")
                skippedTests.takeIf { it.isNotEmpty() }?.prefixedSummary("\tSkipped Tests:")
            }
        }

        private infix fun List<TestDescriptor>.prefixedSummary(subject: String) {
            logger.lifecycle(subject)
            forEach { test -> logger.lifecycle("\t\t${test.displayName()}") }
        }

        private fun TestDescriptor.displayName() = parent?.let { "${it.name} - $name" } ?: "$name"
    })
}

dependencies {
    implementation(kotlin("stdlib"))
    implementation("com.sparkjava:spark-core:2.5.4")
    implementation("org.slf4j:slf4j-simple:1.7.30")

    testImplementation("com.squareup.okhttp:okhttp:2.5.0")
    testImplementation("io.kotest:kotest-runner-junit5-jvm:4.0.5")
    testImplementation("io.kotest:kotest-assertions-core-jvm:4.0.5") // for kotest core jvm assertions
    testImplementation("io.kotest:kotest-property-jvm:4.0.5")
}

sourceSets {
    create("integTest") {
        kotlin {
            compileClasspath += main.get().output + configurations.testRuntimeClasspath
            runtimeClasspath += output + compileClasspath
        }
    }
}

val integTest = task<Test>("integTest") {
    description = "Runs the integTest tests"
    group = "verification"
    testClassesDirs = sourceSets["integTest"].output.classesDirs
    classpath = sourceSets["integTest"].runtimeClasspath
    mustRunAfter(tasks["test"])
}

tasks.check {
    dependsOn(integTest)
}

sourceSets {
    create("journeyTest") {
        kotlin {
            compileClasspath += main.get().output + configurations.testRuntimeClasspath
            runtimeClasspath += output + compileClasspath
        }
    }
}

val journeyTest = task<Test>("journeyTest") {
    description = "Runs the JourneyTest tests"
    group = "verification"
    testClassesDirs = sourceSets["journeyTest"].output.classesDirs
    classpath = sourceSets["journeyTest"].runtimeClasspath
    mustRunAfter(tasks["integTest"])
}

tasks.check {
    dependsOn(journeyTest)
}

希望这对你有帮助。：）

Gradle有一个名为Declarative Test Suite的专用功能支持这种情况：

testing {
    suites {
        val test by getting(JvmTestSuite::class) {
            useJUnitJupiter()
        }

        register("integrationTest", JvmTestSuite::class) {
            dependencies {
                implementation(project())
            }

            targets {
                all {
                    testTask.configure {
                        shouldRunAfter(test)
                    }
                }
            }
        }
    }
}

更多信息：www.example.comhttps://docs.gradle.org/current/userguide/java_testing.html#sec:configuring_java_integration_tests