diff --git a/idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/AbstractFirMultiModuleLazyResolveTest.kt b/idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/AbstractFirMultiModuleLazyResolveTest.kt
index f74a7821b5e..20fcb2778c2 100644
--- a/idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/AbstractFirMultiModuleLazyResolveTest.kt
+++ b/idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/AbstractFirMultiModuleLazyResolveTest.kt
@@ -5,12 +5,14 @@
 
 package org.jetbrains.kotlin.idea.fir.low.level.api
 
+import com.google.gson.JsonElement
+import com.google.gson.JsonObject
 import com.intellij.openapi.vfs.VirtualFileManager
 import com.intellij.psi.PsiManager
-import org.jetbrains.kotlin.fir.declarations.FirResolvePhase
 import org.jetbrains.kotlin.fir.render
 import org.jetbrains.kotlin.idea.fir.low.level.api.api.getOrBuildFir
 import org.jetbrains.kotlin.idea.fir.low.level.api.api.getResolveState
+import org.jetbrains.kotlin.idea.jsonUtils.getString
 import org.jetbrains.kotlin.idea.stubs.AbstractMultiModuleTest
 import org.jetbrains.kotlin.idea.util.sourceRoots
 import org.jetbrains.kotlin.psi.KtFile
@@ -23,7 +25,7 @@ abstract class AbstractFirMultiModuleLazyResolveTest : AbstractMultiModuleTest()
         "${KotlinTestUtils.getHomeDirectory()}/idea/idea-frontend-fir/idea-fir-low-level-api/testdata/multiModuleLazyResolve/"
 
     fun doTest(path: String) {
-        val testStructure = TestProjectStructureReader.read(Paths.get(path))
+        val testStructure = MultiModuleTestProjectStructure.fromTestProjectStructure(TestProjectStructureReader.read(Paths.get(path)))
         val modulesByNames = testStructure.modules.associate { moduleData ->
             moduleData.name to module(moduleData.name)
         }
@@ -55,3 +57,40 @@ abstract class AbstractFirMultiModuleLazyResolveTest : AbstractMultiModuleTest()
         }
     }
 }
+
+private data class FileToResolve(val moduleName: String, val relativeFilePath: String) {
+    val filePath get() = "$moduleName/$relativeFilePath"
+
+    companion object {
+        fun parse(json: JsonElement): FileToResolve {
+            require(json is JsonObject)
+            return FileToResolve(
+                moduleName = json.getString("module"),
+                relativeFilePath = json.getString("file")
+            )
+        }
+    }
+}
+
+private data class MultiModuleTestProjectStructure(
+    val modules: List<TestProjectModule>,
+    val fileToResolve: FileToResolve,
+    val fails: Boolean
+) {
+    companion object {
+        fun fromTestProjectStructure(testProjectStructure: TestProjectStructure): MultiModuleTestProjectStructure {
+            val json = testProjectStructure.json
+
+            val fails = if (json.has(FAILS_FIELD)) json.get(FAILS_FIELD).asBoolean else false
+            val fileToResolve = FileToResolve.parse(json.getAsJsonObject("fileToResolve"))
+
+            return MultiModuleTestProjectStructure(
+                testProjectStructure.modules,
+                fileToResolve,
+                fails
+            )
+        }
+
+        private const val FAILS_FIELD = "fails"
+    }
+}
diff --git a/idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/TestProjectStructure.kt b/idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/TestProjectStructure.kt
index a40c1bb153b..0cdb8141b1e 100644
--- a/idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/TestProjectStructure.kt
+++ b/idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/TestProjectStructure.kt
@@ -13,46 +13,22 @@ import com.intellij.openapi.util.io.FileUtil
 import org.jetbrains.kotlin.idea.jsonUtils.getString
 import java.nio.file.Path
 
-sealed class TestProjectStructure {
-    abstract val modules: List<TestProjectModule>
-    abstract val fileToResolve: FileToResolve
-    abstract val fails: Boolean
-
+internal data class TestProjectStructure(
+    val modules: List<TestProjectModule>,
+    val json: JsonObject,
+) {
     companion object {
         fun parse(json: JsonElement): TestProjectStructure {
             require(json is JsonObject)
-            val fails = if (json.has(FAILS_FIELD)) json.get(FAILS_FIELD).asBoolean else false
 
-            return MultiModuleTestProjectStructure(
-                json.getAsJsonArray("modules").map { TestProjectModule.parse(it) },
-                FileToResolve.parse(json.getAsJsonObject("fileToResolve")),
-                fails
-            )
-        }
-
-        private const val FAILS_FIELD = "fails"
-    }
-}
-
-data class FileToResolve(val moduleName: String, val relativeFilePath: String) {
-    val filePath get() = "$moduleName/$relativeFilePath"
-
-    companion object {
-        fun parse(json: JsonElement): FileToResolve {
-            require(json is JsonObject)
-            return FileToResolve(
-                moduleName = json.getString("module"),
-                relativeFilePath = json.getString("file")
+            return TestProjectStructure(
+                json.getAsJsonArray("modules").map(TestProjectModule::parse),
+                json,
             )
         }
     }
 }
 
-data class MultiModuleTestProjectStructure(
-    override val modules: List<TestProjectModule>,
-    override val fileToResolve: FileToResolve,
-    override val fails: Boolean
-) : TestProjectStructure()
 
 data class TestProjectModule(val name: String, val dependsOnModules: List<String>) {
     companion object {
@@ -71,7 +47,7 @@ data class TestProjectModule(val name: String, val dependsOnModules: List<String
     }
 }
 
-object TestProjectStructureReader {
+internal object TestProjectStructureReader {
     fun read(testDirectory: Path, jsonFileName: String = "structure.json"): TestProjectStructure {
         val jsonFile = testDirectory.resolve(jsonFileName)