Add a simple plugin test

plugin/build.gradle.kts

@@ -53,6 +53,15 @@ pluginBundle {
     }
 }
 
+configure<PublishingExtension> {
+    repositories {
+        maven {
+            name = "pluginTest"
+            url = uri("file://${rootProject.buildDir}/localMaven")
+        }
+    }
+}
+
 detekt {
     toolVersion = "1.4.0"
     input = files("src/")
@@ -69,3 +78,8 @@ tasks.jacocoTestReport {
 tasks.check {
     dependsOn(tasks.jacocoTestReport)
 }
+
+tasks.withType<Test> {
+    dependsOn("publishPluginMavenPublicationToPluginTestRepository")
+    inputs.dir("src/test/testProject")
+}

plugin/src/test/java/com/yelp/plugin/PluginTests.kt

@@ -0,0 +1,28 @@
+package com.yelp.plugin
+
+import org.gradle.testkit.runner.BuildResult
+import org.gradle.testkit.runner.GradleRunner
+import org.gradle.testkit.runner.TaskOutcome
+import org.junit.Assert
+import org.junit.Test
+import java.io.File
+
+
+class PluginTests {
+  @Test
+  fun `basic plugin test`() {
+    val tmpDir = File(".", "build/testProject")
+    tmpDir.deleteRecursively()
+
+    println(File(".").absolutePath)
+    File(".", "src/test/testProject").copyRecursively(tmpDir)
+
+    val result = GradleRunner.create().withProjectDir(tmpDir)
+        .forwardStdOutput(System.out.writer())
+        .forwardStdError(System.err.writer())
+        .withArguments("generateSwagger")
+        .build()
+
+    Assert.assertEquals(TaskOutcome.SUCCESS, result.task(":generateSwagger")?.outcome)
+  }
+}

plugin/src/test/testProject/build.gradle.kts

@@ -0,0 +1,30 @@
+import com.yelp.codegen.plugin.GenerateTaskConfiguration
+
+buildscript {
+  repositories {
+    maven {
+      url = uri("../../../build/localMaven")
+    }
+    jcenter {
+      content {
+        excludeGroup("com.yelp.codegen")
+      }
+    }
+  }
+  dependencies {
+    // Always take the latest version from the local test repo
+    // This is not super robust and we could find a way to communicate the version to the testProject
+    // by copying the root buildSrc to the testProject or extracting the version in a properties file
+    classpath("com.yelp.codegen:plugin:+")
+  }
+}
+
+apply(plugin = "com.yelp.codegen.plugin")
+
+configure<GenerateTaskConfiguration> {
+  platform = "kotlin"
+  packageName = "com.yelp.codegen.samples"
+  // this file is in rootDir/plugin/build/testProject/
+  inputFile = file("../../../samples/junit-tests/junit_tests_specs.json")
+  outputDir = file("./build/generetadSources")
+}

plugin/src/test/testProject/settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name="testProject"