Suggest tests for nested classes & static methods inside abstracts #1400 (#1406)

Suggest tests for nested classes & static methods inside abstracts

Co-authored-by: Vassiliy Kudryashov <vassiliy.kudryashov@gmail.com>

Author: volivan239

utbot-intellij/src/main/kotlin/org/utbot/intellij/plugin/language/JavaLanguage.kt

@@ -28,7 +28,6 @@ import org.jetbrains.kotlin.utils.addIfNotNull
 import org.utbot.framework.plugin.api.util.LockFile
 import org.utbot.intellij.plugin.models.packageName
 import org.utbot.intellij.plugin.ui.InvalidClassNotifier
-import org.utbot.intellij.plugin.util.isAbstract
 import org.utbot.intellij.plugin.language.agnostic.LanguageAssistant
 import org.utbot.intellij.plugin.util.findSdkVersionOrNull
 
@@ -170,12 +169,6 @@ object JvmLanguageAssistant : LanguageAssistant() {
             return true
         }
 
-        val isAbstractOrInterface = this.isInterface || this.isAbstract
-        if (isAbstractOrInterface) {
-            if (withWarnings) InvalidClassNotifier.notify("abstract class or interface ${this.name}")
-            return true
-        }
-
         val isInvisible = !this.isVisible
         if (isInvisible) {
             if (withWarnings) InvalidClassNotifier.notify("private or protected class ${this.name}")

utbot-intellij/src/main/kotlin/org/utbot/intellij/plugin/util/PsiClassHelper.kt

@@ -2,6 +2,7 @@ package org.utbot.intellij.plugin.util
 
 import com.intellij.psi.PsiClass
 import com.intellij.psi.PsiMember
+import com.intellij.psi.PsiMethod
 import com.intellij.psi.PsiModifier
 import com.intellij.psi.SyntheticElement
 import com.intellij.refactoring.util.classMembers.MemberInfo
@@ -17,6 +18,9 @@ import org.utbot.framework.UtSettings
 val PsiMember.isAbstract: Boolean
     get() = modifierList?.hasModifierProperty(PsiModifier.ABSTRACT)?: false
 
+val PsiMember.isStatic: Boolean
+    get() = modifierList?.hasModifierProperty(PsiModifier.STATIC)?: false
+
 private val PsiMember.isKotlinGetterOrSetter: Boolean
     get() {
         if (this !is KtLightMethod)
@@ -32,11 +36,20 @@ private val PsiMember.isKotlinAndProtected: Boolean
 private val PsiMember.isKotlinAutogeneratedMethod: Boolean
     get() = this is KtLightMethod && navigationElement is KtClass
 
-fun Iterable<MemberInfo>.filterTestableMethods(): List<MemberInfo> = this
+private val PsiMethod.canBeCalledStatically: Boolean
+    get() = isStatic || containingClass?.isStatic ?: throw IllegalStateException("No containing class found for method $this")
+
+private val PsiMethod.isUntestableMethodOfAbstractOrInterface: Boolean
+    get() {
+        val hasAbstractContext = generateSequence(containingClass) { it.containingClass }.any { it.isAbstract || it.isInterface }
+        return hasAbstractContext && !canBeCalledStatically
+    }
+
+private fun Iterable<MemberInfo>.filterTestableMethods(): List<MemberInfo> = this
     .filterWhen(UtSettings.skipTestGenerationForSyntheticAndImplicitlyDeclaredMethods) {
         it.member !is SyntheticElement && !it.member.isKotlinAutogeneratedMethod
     }
-    .filterNot { it.member.isAbstract }
+    .filterNot { (it.member as PsiMethod).isUntestableMethodOfAbstractOrInterface }
     .filterNot { it.member.isKotlinGetterOrSetter }
     .filterNot { it.member.isKotlinAndProtected }