diff --git a/src/test/java/eu/ztsh/wymiana/validation/AdultValidatorTest.java b/src/test/java/eu/ztsh/wymiana/validation/AdultValidatorTest.java
index ca24718..d4a2ed1 100644
--- a/src/test/java/eu/ztsh/wymiana/validation/AdultValidatorTest.java
+++ b/src/test/java/eu/ztsh/wymiana/validation/AdultValidatorTest.java
@@ -1,58 +1,42 @@
 package eu.ztsh.wymiana.validation;
 
-import jakarta.validation.ConstraintValidatorContext;
-import org.hibernate.validator.internal.engine.DefaultClockProvider;
-import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
-import org.mockito.Mockito;
 
-import static org.assertj.core.api.Assertions.assertThat;
+class AdultValidatorTest extends ValidatorTest<AdultValidator, String> {
 
-class AdultValidatorTest {
-
-    private static AdultValidator validator;
-    private static ConstraintValidatorContext validatorContext;
-
-    @BeforeAll
-    static void prepare() {
-        validator = new AdultValidator();
-        validatorContext = Mockito.mock(ConstraintValidatorContext.class);
-        Mockito.when(validatorContext.getClockProvider()).thenReturn(DefaultClockProvider.INSTANCE);
+    protected AdultValidatorTest() {
+        super(new AdultValidator());
     }
 
     @Test
     @DisplayName("No digits in PESEL")
     void invalidPatternTest() {
-        assertThat(call("notAPesel")).isFalse();
+        assertThatValidation("notAPesel").isFalse();
     }
 
     @Test
     @DisplayName("Not an adult")
     void notAnAdultTest() {
-        assertThat(call("24242400000")).isFalse();
+        assertThatValidation("24242400000").isFalse();
     }
 
     @Test
     @DisplayName("Adult")
     void adultTest() {
-        assertThat(call("88010100000")).isTrue();
+        assertThatValidation("88010100000").isTrue();
     }
 
     @Test
     @DisplayName("Elderly person")
     void seniorTest() {
-        assertThat(call("00010100000")).isTrue();
+        assertThatValidation("00010100000").isTrue();
     }
 
     @Test
     @DisplayName("Invalid date")
     void notAValidDateTest() {
-        assertThat(call("00919100000")).isFalse();
-    }
-
-    private boolean call(String value) {
-        return validator.isValid(value, validatorContext);
+        assertThatValidation("00919100000").isFalse();
     }
 
 }
diff --git a/src/test/java/eu/ztsh/wymiana/validation/ValidatorTest.java b/src/test/java/eu/ztsh/wymiana/validation/ValidatorTest.java
new file mode 100644
index 0000000..7dc4bd8
--- /dev/null
+++ b/src/test/java/eu/ztsh/wymiana/validation/ValidatorTest.java
@@ -0,0 +1,31 @@
+package eu.ztsh.wymiana.validation;
+
+import jakarta.validation.ConstraintValidator;
+import jakarta.validation.ConstraintValidatorContext;
+import org.assertj.core.api.AbstractBooleanAssert;
+import org.hibernate.validator.internal.engine.DefaultClockProvider;
+import org.junit.jupiter.api.BeforeAll;
+import org.mockito.Mockito;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public abstract class ValidatorTest<V extends ConstraintValidator<?, C>, C> {
+
+    private final V validator;
+    private static ConstraintValidatorContext validatorContext;
+
+    protected ValidatorTest(V validator) {
+        this.validator = validator;
+    }
+
+    @BeforeAll
+    static void prepare() {
+        validatorContext = Mockito.mock(ConstraintValidatorContext.class);
+        Mockito.when(validatorContext.getClockProvider()).thenReturn(DefaultClockProvider.INSTANCE);
+    }
+
+    protected AbstractBooleanAssert<?> assertThatValidation(C value) {
+        return assertThat(validator.isValid(value, validatorContext));
+    }
+
+}