Fix OptionalExpectation in Gradle plugin (#2259)

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/KotlinNativeBinaries.kt

@@ -40,6 +40,12 @@ interface KotlinNativeBinary : ComponentWithDependencies, BuildableComponent, Co
     /** Returns the source files of this binary. */
     val sources: FileCollection
 
+    /**
+     * Returns common sources used to build this binary
+     * (both common for all native targets and avalable via expectedBy relation).
+     */
+    val commonSources: FileCollection
+
     /**
      * Konan target the library is built for
      */

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/internal/AbstractKotlinNativeBinary.kt

@@ -94,6 +94,9 @@ abstract class AbstractKotlinNativeBinary(
     override val sources: FileCollection
         get() = sourceSet.getAllSources(konanTarget)
 
+    override val commonSources: FileCollection
+        get() = sourceSet.getCommonMultiplatformSources() + sourceSet.getCommonNativeSources()
+
     private val dependencies = objects.newInstance<DefaultComponentDependencies>(
         DefaultComponentDependencies::class.java,
         name + "Implementation"

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/internal/KotlinNativeTestExecutableImpl.kt

@@ -60,6 +60,11 @@ open class KotlinNativeTestExecutableImpl @Inject constructor(
     override val sources: FileCollection
         get() = super.sources + mainSources.getAllSources(konanTarget)
 
+    override val commonSources: FileCollection
+        get() = super.commonSources +
+                mainSources.getCommonNativeSources() +
+                mainSources.getCommonMultiplatformSources()
+
     override val outputRootName: String = "test-exe"
 
     override val additionalCompilerOptions: Collection<String>

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/tasks/KotlinNativeCompile.kt

@@ -49,9 +49,7 @@ open class KotlinNativeCompile @Inject constructor(internal val binary: Abstract
     override fun getSource(): FileTree = sources.asFileTree
 
     private val commonSources: FileCollection
-        get() = with(binary.sourceSet) {
-            getCommonMultiplatformSources() + getCommonNativeSources()
-        }
+        get() = binary.commonSources
 
     val libraries: Configuration
         @InputFiles get() = binary.klibs

tools/kotlin-native-gradle-plugin/src/test/kotlin/ExperimentalPluginTests.kt

@@ -1036,4 +1036,40 @@ class ExperimentalPluginTests {
             "Project property 'konan.home' is deprecated. Use 'org.jetbrains.kotlin.native.home' instead."
         ))
     }
+
+    @Test
+    fun `Plugin should support OptionalExpectation`() {
+        val project = KonanProject.createEmpty(projectDirectory).apply {
+            buildFile.writeText("""
+                plugins {
+                    id 'kotlin-native'
+                }
+
+                components.main.targets = ['host']
+                components.test.targets = ['host']
+            """.trimIndent())
+            generateSrcFile("main.kt", """
+                import kotlin.jvm.*
+
+                class A {
+                    @JvmField
+                    val a = "A.a"
+                }
+
+                fun foo() {
+                    println(A().a)
+                }
+            """.trimIndent())
+            generateSrcFile(listOf("src", "test", "kotlin"), "test.kt", """
+                import kotlin.test.*
+
+                @Test
+                fun test() {
+                    foo()
+                }
+            """.trimIndent())
+        }
+        val result = project.createRunner().withArguments("build").build()
+        assertTrue(result.output.contains("A.a"))
+    }
 }