diff --git a/design-patterns/src/main/java/com/ontotext/javacourse/designpatterns/dfgdfg.java b/design-patterns/src/main/java/com/ontotext/javacourse/designpatterns/dfgdfg.java
new file mode 100644
index 0000000..c4b1c5e
--- /dev/null
+++ b/design-patterns/src/main/java/com/ontotext/javacourse/designpatterns/dfgdfg.java
@@ -0,0 +1,3 @@
+package com.ontotext.javacourse.designpatterns;
+
+public class dfgdfg {}
diff --git a/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/abstractfactory/factorymethodfactory/ProductFactoryTest.java b/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/abstractfactory/factorymethodfactory/ProductFactoryTest.java
deleted file mode 100644
index d51af95..0000000
--- a/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/abstractfactory/factorymethodfactory/ProductFactoryTest.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.ontotext.javacourse.designpatterns.abstractfactory.factorymethodfactory;
-
-import static org.junit.jupiter.api.Assertions.*;
-
-import com.ontotext.javacourse.designpatterns.abstractfactory.Product;
-import org.junit.jupiter.api.Test;
-
-class ProductFactoryTest {
-
-  @Test
-  void createInstanceReturnsProductInstance() {
-    ProductFactory factory = new ProductFactory();
-    assertTrue(factory.createInstance() instanceof Product);
-  }
-}
diff --git a/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/abstractfactory/reflectionfactory/ReflectionProductFactoryTest.java b/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/abstractfactory/reflectionfactory/ReflectionProductFactoryTest.java
deleted file mode 100644
index 35e1ead..0000000
--- a/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/abstractfactory/reflectionfactory/ReflectionProductFactoryTest.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.ontotext.javacourse.designpatterns.abstractfactory.reflectionfactory;
-
-import static org.junit.jupiter.api.Assertions.*;
-
-import org.junit.jupiter.api.Test;
-
-class ReflectionProductFactoryTest {
-
-  @Test
-  void createInstanceReturnsProductInstance() {
-    ReflectionProductFactory factory = new ReflectionProductFactory();
-    assertNotNull(
-        factory.createInstance("com.ontotext.javacourse.designpatterns.abstractfactory.MyProduct"));
-  }
-}
diff --git a/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/mail/MailBuilderTest.java b/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/mail/MailBuilderTest.java
deleted file mode 100644
index 9d3f2c5..0000000
--- a/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/mail/MailBuilderTest.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package com.ontotext.javacourse.designpatterns.mail;
-
-import static org.junit.jupiter.api.Assertions.*;
-
-import com.ontotext.javacourse.designpatterns.mail.builders.Mail;
-import org.junit.jupiter.api.Test;
-
-class MailBuilderTest {
-
-  @Test
-  void buildConstructsMailObject() {
-    Builder builder = new Builder();
-    Mail mail =
-        builder
-            .from("me")
-            .to("ivan")
-            .subject("work")
-            .content("blabla")
-            .cc("pesho")
-            .attachments("very important info")
-            .build();
-    boolean isCorrectlyBuilt =
-        mail.getFrom().equals("me")
-            && mail.getTo().equals("ivan")
-            && mail.getSubject().equals("work")
-            && mail.getContent().equals("blabla")
-            && mail.getCc().stream().count() == 1
-            && mail.getAttachments().stream().count() == 1;
-    assertTrue(isCorrectlyBuilt);
-  }
-
-  @Test
-  void buildThrowsExceptionIfFromFieldIsMissing() {
-    Builder builder = new Builder();
-    builder.to("nobody").subject("work").content("sdfs").cc("pp");
-    assertThrows(MissingFieldException.class, builder::build);
-  }
-}
diff --git a/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/singleton/SingletonTest.java b/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/singleton/SingletonTest.java
deleted file mode 100644
index be866c8..0000000
--- a/design-patterns/src/test/java/com/ontotext/javacourse/designpatterns/singleton/SingletonTest.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.ontotext.javacourse.designpatterns.singleton;
-
-import static org.junit.jupiter.api.Assertions.*;
-
-import org.junit.jupiter.api.Test;
-
-class SingletonTest {
-
-  @Test
-  void getInstanceReturnsSingletonInstance() {
-    assertNotNull(Singleton.getInstance());
-  }
-
-  @Test
-  void getInstanceDoesNotCreateMoreThanOneInstance() {
-    Singleton firstInvocation = Singleton.getInstance();
-    Singleton secondInvocation = Singleton.getInstance();
-    assertEquals(firstInvocation, secondInvocation);
-  }
-}