Fix buildPlugin, fix #335

tools/gradle-plugin/src/integTest/groovy/net/mamoe/mirai/console/gradle/AbstractTest.groovy

@@ -23,7 +23,7 @@ abstract class AbstractTest {
     File settingsFile
     File propertiesFile
 
-    def gradleRunner() {
+    GradleRunner gradleRunner() {
         println(PluginUnderTestMetadataReading.readImplementationClasspath())
         GradleRunner.create()
                 .withProjectDir(tempDir)

tools/gradle-plugin/src/integTest/groovy/net/mamoe/mirai/console/gradle/TestBuildPlugin.groovy

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2019-2021 Mamoe Technologies and contributors.
+ *
+ *  此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ *  Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ *  https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.gradle
+
+import org.junit.jupiter.api.Test
+
+class TestBuildPlugin extends AbstractTest {
+
+    @Test
+    void "can build plugin"() {
+        gradleRunner()
+                .withArguments("buildPlugin", "--stacktrace")
+                .build()
+    }
+}

tools/gradle-plugin/src/main/kotlin/BuildMiraiPluginTask.kt

@@ -11,7 +11,6 @@ package net.mamoe.mirai.console.gradle
 
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import org.gradle.api.tasks.CacheableTask
-import org.gradle.api.tasks.OutputFile
 import org.jetbrains.kotlin.gradle.plugin.KotlinTarget
 import java.io.File
 import javax.inject.Inject
@@ -23,7 +22,6 @@ public open class BuildMiraiPluginTask @Inject constructor(
     /**
      * ShadowJar 打包结果
      */
-    @get:OutputFile
     public val output: File
         get() = outputs.files.singleFile