Lessen thisInstance creation in parameterized test generation (#1065)

* Lessen thisInstance creation in parameterized test generation

* Avoid incorrect configuration

Co-authored-by: Egor Kulikov <egor.k.kulikov@gmail.com>

Author: sofurihafe

utbot-framework/src/main/kotlin/org/utbot/framework/codegen/model/constructor/tree/CgMethodConstructor.kt

@@ -1367,7 +1367,9 @@ internal class CgMethodConstructor(val context: CgContext) : CgContextOwner by c
                     substituteStaticFields(statics, isParametrized = true)
 
                     // build this instance
-                    thisInstance = genericExecution.stateBefore.thisInstance?.let { currentMethodParameters[CgParameterKind.ThisInstance] }
+                    thisInstance = genericExecution.stateBefore.thisInstance?.let {
+                        variableConstructor.getOrCreateVariable(it)
+                    }
 
                     // build arguments for method under test and parameterized test
                     for (index in genericExecution.stateBefore.parameters.indices) {
@@ -1429,20 +1431,6 @@ internal class CgMethodConstructor(val context: CgContext) : CgContextOwner by c
         val executableUnderTestParameters = testSet.executableId.executable.parameters
 
         return mutableListOf<CgParameterDeclaration>().apply {
-            // this instance
-            val thisInstanceModel = genericExecution.stateBefore.thisInstance
-            if (thisInstanceModel != null) {
-                val type = wrapTypeIfRequired(thisInstanceModel.classId)
-                val thisInstance = CgParameterDeclaration(
-                    parameter = declareParameter(
-                        type = type,
-                        name = nameGenerator.variableName(type)
-                    ),
-                    isReferenceType = true
-                )
-                this += thisInstance
-                currentMethodParameters[CgParameterKind.ThisInstance] = thisInstance.parameter
-            }
             // arguments
             for (index in genericExecution.stateBefore.parameters.indices) {
                 val argumentName = paramNames[executableUnderTest]?.get(index)
@@ -1554,9 +1542,6 @@ internal class CgMethodConstructor(val context: CgContext) : CgContextOwner by c
 
     private fun createExecutionArguments(testSet: CgMethodTestSet, execution: UtExecution): List<CgExpression> {
         val arguments = mutableListOf<CgExpression>()
-        execution.stateBefore.thisInstance?.let {
-            arguments += variableConstructor.getOrCreateVariable(it)
-        }
 
         for ((paramIndex, paramModel) in execution.stateBefore.parameters.withIndex()) {
             val argumentName = paramNames[testSet.executableId]?.get(paramIndex)

utbot-framework/src/main/kotlin/org/utbot/framework/codegen/model/tree/CgElement.kt

@@ -745,13 +745,11 @@ data class CgParameterDeclaration(
 
 /**
  * Test method parameter can be one of the following types:
- * - this instance for method under test (MUT)
  * - argument of MUT with a certain index
  * - result expected from MUT with the given arguments
  * - exception expected from MUT with the given arguments
  */
 sealed class CgParameterKind {
-    object ThisInstance : CgParameterKind()
     data class Argument(val index: Int) : CgParameterKind()
     data class Statics(val model: UtModel) : CgParameterKind()
     object ExpectedResult : CgParameterKind()

utbot-framework/src/main/kotlin/org/utbot/tests/infrastructure/CheckersUtil.kt

@@ -52,6 +52,9 @@ data class TestFrameworkConfiguration(
             // junit4 doesn't support parametrized tests
             if (testFramework == Junit4 && parametrizedTestSource == ParametrizedTestSource.PARAMETRIZE) return true
 
+            //if we do not use mocks at all, we do not use static mocking too
+            if (mockStrategy == NO_MOCKS && staticsMocking == MockitoStaticMocking) return true
+
             // if we want to generate mocks for every class but CUT, we must have specified staticsMocking
             if (mockStrategy == OTHER_CLASSES && staticsMocking == NoStaticMocking) return true