Fix common source sets not propogated

dokka-runners/dokka-gradle-plugin/src/testFunctional/kotlin/KmpCommonSourceSharedWithDependentsTest.kt

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2014-2024 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+package org.jetbrains.dokka.gradle
+
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.paths.shouldBeAFile
+import io.kotest.matchers.string.shouldContain
+import io.kotest.matchers.string.shouldNotContain
+import org.gradle.testkit.runner.TaskOutcome.SUCCESS
+import org.jetbrains.dokka.gradle.internal.DokkaConstants.DOKKA_VERSION
+import org.jetbrains.dokka.gradle.utils.*
+import kotlin.io.path.readText
+
+class KmpCommonSourceSharedWithDependentsTest : FunSpec({
+    test("common source set is propagated to dependents") {
+        val project = initProject()
+
+        project
+            .runner
+            .addArguments(":dokkaGenerate")
+            .build {
+                shouldHaveRunTask(":dokkaGenerate").shouldHaveOutcome(SUCCESS)
+
+                val htmlOutputDir = project.projectDir.resolve("build/dokka/html")
+
+                withClue("htmlOutputDir: ${htmlOutputDir.toUri()}") {
+                    val iosX64FnFile =
+                        htmlOutputDir.resolve("-kmp-common-source-shared-with-dependents-test/[root]/ios-x64-fn.html")
+
+                    iosX64FnFile.shouldBeAFile()
+
+                    iosX64FnFile.readText().let { text ->
+                        text shouldNotContain "Error class: unknown class"
+                        text shouldContain "Error type: Unresolved type"
+                    }
+                }
+            }
+    }
+})
+
+
+private fun initProject(
+    config: GradleProjectTest.() -> Unit = {},
+): GradleProjectTest {
+    return gradleKtsProjectTest("KmpCommonSourceSharedWithDependentsTest") {
+
+        buildGradleKts = """
+            |plugins {
+            |  kotlin("multiplatform") version embeddedKotlinVersion
+            |  id("org.jetbrains.dokka") version "$DOKKA_VERSION"
+            |}
+            |
+            |kotlin {
+            |    jvm()
+            |    iosX64()
+            |    iosArm64()
+            |}
+            |
+            """.trimMargin()
+
+        createKotlinFile(
+            "src/commonMain/kotlin/CommonMainCls.kt", """
+            /** commonMain class */
+            class CommonMainCls
+        """.trimIndent()
+        )
+
+        createKotlinFile(
+            "src/iosMain/kotlin/IosMainCls.kt", """
+            /** iosMain class */
+            class IosMainCls
+        """.trimIndent()
+        )
+
+        createKotlinFile(
+            "src/iosX64Main/kotlin/iosX64Fn.kt", """
+            /** iosX64Main function */
+            fun iosX64Fn(a: CommonMainCls, b: IosMainCls) {
+              println(a)
+              println(b)
+            }
+        """.trimIndent()
+        )
+
+        config()
+    }
+}