[kpm] kgp-idea: Implement IdeaKpmProjectBackwardsCompatibilityDeserializationTest

^KT-52568 In Progress

libraries/tools/kotlin-gradle-plugin-idea/src/test/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKpmProjectBackwardsCompatibilityDeserializationTest.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.kpm.idea
+
+import org.jetbrains.kotlin.gradle.kpm.idea.testFixtures.*
+import org.jetbrains.kotlin.gradle.kpm.idea.testUtils.deserializeIdeaKpmProjectWithBackwardsCompatibleClasses
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class IdeaKpmProjectBackwardsCompatibilityDeserializationTest {
+
+    @Test
+    fun `test - simpleInstance`() {
+        val project = TestIdeaKpmInstances.simpleProject
+        val deserialized = deserializeIdeaKpmProjectWithBackwardsCompatibleClasses(project)
+        val deserializedProxy = createProxyInstance<IdeaKpmProject>(deserialized)
+
+        assertEquals(project.coreLibrariesVersion, deserializedProxy.coreLibrariesVersion)
+        assertEquals(project.modules.size, deserializedProxy.modules.size)
+        project.modules.forEach { module ->
+            val deserializedModule = deserializedProxy.assertContainsModule(module.name)
+            assertEquals(module.coordinates, deserializedModule.coordinates.copy())
+
+            module.fragments.forEach { fragment ->
+                val deserializedFragment = deserializedModule.assertContainsFragment(fragment.name)
+                assertEquals(fragment.coordinates, deserializedFragment.coordinates.copy())
+            }
+        }
+    }
+}