Kapt: Add tests for the command-line 'kapt' tool

plugins/kapt3/kapt3-cli/testData/integration/simple/Test.kt

@@ -0,0 +1,19 @@
+package test
+
+import apt.Anno
+import generated.Test as TestGenerated
+
+@Anno
+class Test {
+    @field:Anno
+    val property: String = ""
+
+    @Anno
+    fun function() {
+
+    }
+}
+
+fun main() {
+    println("Generated class: " + TestGenerated::class.java.name)
+}

plugins/kapt3/kapt3-cli/testData/integration/simple/ap/META-INF/services/javax.annotation.processing.Processor

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+apt.SampleApt

plugins/kapt3/kapt3-cli/testData/integration/simple/ap/Processor.kt

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+package apt
+
+import javax.annotation.processing.*
+import javax.lang.model.SourceVersion
+import javax.lang.model.element.TypeElement
+import javax.tools.Diagnostic.Kind.*
+
+annotation class Anno
+
+class SampleApt : AbstractProcessor() {
+    override fun process(annotations: Set<TypeElement>, roundEnv: RoundEnvironment): Boolean {
+        for (element in roundEnv.getElementsAnnotatedWith(Anno::class.java)) {
+            val generatedSimpleName = element.simpleName.toString().capitalize()
+            processingEnv.filer.createSourceFile("generated.$generatedSimpleName").openWriter().use {
+                it.write("package generated;\npublic class $generatedSimpleName {}")
+            }
+        }
+
+        return true
+    }
+
+    override fun getSupportedOptions() = emptySet<String>()
+    override fun getSupportedSourceVersion() = SourceVersion.RELEASE_8
+    override fun getSupportedAnnotationTypes() = setOf("apt.Anno")
+}

plugins/kapt3/kapt3-cli/testData/integration/simple/build.txt

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+# mkdir
+output/ap
+output/stubs
+output/classes
+output/javaClasses
+output/sources
+
+# kotlinc
+-cp %KOTLIN_STDLIB%
+-d output/ap
+ap/Processor.kt
+
+# copy
+ap/META-INF/services/javax.annotation.processing.Processor
+output/ap/META-INF/services/javax.annotation.processing.Processor
+
+# kapt
+-Kapt-stubs=output/stubs
+-Kapt-classes=output/classes
+-Kapt-sources=output/sources
+-Kapt-classpath=output/ap
+-d output/classes
+-cp output/ap:%KOTLIN_STDLIB%
+Test.kt
+
+# javac
+-cp output/ap
+-d output/javaClasses
+-proc:none
+output/sources/generated/Function.java
+output/sources/generated/Property.java
+output/sources/generated/Test.java
+
+# java
+-cp output/classes:output/javaClasses:output/ap:%KOTLIN_STDLIB%
+test.TestKt
+
+# after
+Generated class: generated.Test