diff --git a/Object-Oriented Programming/Base Class Initialization/Exercise 3/src/Task.kt b/Object-Oriented Programming/Base Class Initialization/Exercise 3/src/Task.kt
index c4cf038a..02bc3573 100644
--- a/Object-Oriented Programming/Base Class Initialization/Exercise 3/src/Task.kt	
+++ b/Object-Oriented Programming/Base Class Initialization/Exercise 3/src/Task.kt	
@@ -1,6 +1,7 @@
-// BaseClassInit/BCIExercise1.kt
 package baseClassInitializationExercise3
 
+import atomictest.trace
+
 open class Animal(val sound: String = "???")
 
 class Cat(sound: String = "meow") : Animal(sound)
@@ -9,9 +10,14 @@ class Dog(sound: String = "woof") : Animal(sound)
 
 fun main() {
   val animal = Animal()
-  println(animal.sound)
+  trace(animal.sound)
   val cat = Cat()
-  println(cat.sound)
+  trace(cat.sound)
   val dog = Dog()
-  println(dog.sound)
+  trace(dog.sound)
+  trace eq """
+    ???
+    meow
+    woof
+  """
 }
\ No newline at end of file
diff --git a/Object-Oriented Programming/Base Class Initialization/Exercise 3/task-info.yaml b/Object-Oriented Programming/Base Class Initialization/Exercise 3/task-info.yaml
index ca2ad63a..6028c582 100644
--- a/Object-Oriented Programming/Base Class Initialization/Exercise 3/task-info.yaml	
+++ b/Object-Oriented Programming/Base Class Initialization/Exercise 3/task-info.yaml	
@@ -3,19 +3,19 @@ files:
 - name: src/Task.kt
   visible: true
   placeholders:
-  - offset: 75
+  - offset: 67
     length: 146
     placeholder_text: '/* TODO: Implement Animal, Cat and Dog classes */'
-  - offset: 236
-    length: 125
+  - offset: 228
+    length: 119
     placeholder_text: |-
       /*
         val animal = Animal()
-        println(animal.sound)
+        trace(animal.sound)
         val cat = Cat()
-        println(cat.sound)
+        trace(cat.sound)
         val dog = Dog()
-        println(dog.sound)
+        trace(dog.sound)
       */
 - name: test/Tests.kt
   visible: false
diff --git a/Object-Oriented Programming/Base Class Initialization/Exercise 3/test/Tests.kt b/Object-Oriented Programming/Base Class Initialization/Exercise 3/test/Tests.kt
index 6de08442..6f73dd85 100644
--- a/Object-Oriented Programming/Base Class Initialization/Exercise 3/test/Tests.kt	
+++ b/Object-Oriented Programming/Base Class Initialization/Exercise 3/test/Tests.kt	
@@ -1,11 +1,71 @@
 package baseClassInitializationExercise3
 
+import atomictest.trace
+import org.junit.FixMethodOrder
 import org.junit.Test
-import util.unimplementedTest
+import org.junit.runners.MethodSorters
+import util.*
+import kotlin.reflect.full.createInstance
+import kotlin.test.assertEquals
 
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
 class TestBaseClassInitializationExercise3 {
-    @Test fun testSolution() {
-        //TODO: implement your test here
-        unimplementedTest()
+
+  private val packageName = "baseClassInitializationExercise3"
+
+  @Test
+  fun `#01 classes structure`() {
+    loadClass(packageName, "Animal").apply {
+      assertConstructorNumber(1)
+      assertParametersOfFirstConstructor(
+          "sound" to String::class
+      )
+      assertMemberProperty("sound", String::class)
     }
+    loadClass(packageName, "Cat").apply {
+      assertInheritance("Animal")
+      assertConstructorNumber(1)
+      assertParametersOfFirstConstructor(
+          "sound" to String::class
+      )
+      assertNoDeclaredMemberProperty("sound")
+    }
+    loadClass(packageName, "Dog").apply {
+      assertInheritance("Animal")
+      assertConstructorNumber(1)
+      assertParametersOfFirstConstructor(
+          "sound" to String::class
+      )
+      assertNoDeclaredMemberProperty("sound")
+    }
+  }
+
+  @Test
+  fun `#02 animal sounds`() {
+    loadClass(packageName, "Animal").apply {
+      val animal = createInstance()
+      val sound = loadMemberProperty(this, "sound").call(animal) as String
+      trace(sound)
+    }
+    loadClass(packageName, "Cat").apply {
+      val cat = createInstance()
+      val sound = loadMemberProperty(this, "sound").call(cat) as String
+      trace(sound)
+    }
+    loadClass(packageName, "Dog").apply {
+      val dog = createInstance()
+      val sound = loadMemberProperty(this, "sound").call(dog) as String
+      trace(sound)
+    }
+
+    assertEquals(
+        message = "Incorrect animal sounds",
+        actual = loadTraceContent(),
+        expected = listOf(
+            "???",
+            "meow",
+            "woof"
+        )
+    )
+  }
 }
\ No newline at end of file
diff --git a/util/test/util.kt b/util/test/util.kt
index feec4417..f768fee7 100644
--- a/util/test/util.kt
+++ b/util/test/util.kt
@@ -9,6 +9,7 @@ import java.lang.reflect.Field
 import java.lang.reflect.Method
 import kotlin.reflect.*
 import kotlin.reflect.full.createType
+import kotlin.reflect.full.declaredMemberProperties
 import kotlin.reflect.full.memberFunctions
 import kotlin.reflect.full.memberProperties
 import kotlin.reflect.jvm.isAccessible
@@ -195,14 +196,20 @@ fun loadMemberProperty(kClass: KClass<*>, propertyName: String): KProperty<*> {
             .single()
 }
 
+fun KClass<*>.assertNoDeclaredMemberProperty(propertyName: String) {
+    declaredMemberProperties
+        .filter { it.name == propertyName }
+        .checkNotFoundEntities("the '$propertyName' member property", "'$simpleName' class")
+}
+
 fun KClass<*>.assertNoMemberProperty(propertyName: String) {
     memberProperties
             .filter { it.name == propertyName }
             .checkNotFoundEntities("the '$propertyName' member property", "'$simpleName' class")
 }
 
-fun KClass<*>.assertMemberProperty(propertyName: String, expectedType: KType) {
-    loadMemberPropertyWithType(this, propertyName, expectedType)
+fun KClass<*>.assertMemberProperty(propertyName: String, expectedType: KClass<*>) {
+    loadMemberPropertyWithType(this, propertyName, expectedType.createType())
 }
 
 fun loadMemberPropertyWithType(kClass: KClass<*>, propertyName: String, expectedType: KType): KProperty<*> {