diff --git a/src/main/java/daybyquest/interest/domain/Interests.java b/src/main/java/daybyquest/interest/domain/Interests.java
index cf6ab71..c21a018 100644
--- a/src/main/java/daybyquest/interest/domain/Interests.java
+++ b/src/main/java/daybyquest/interest/domain/Interests.java
@@ -22,7 +22,7 @@ public void save(final Interest interest) {
         interestRepository.save(interest);
     }
 
-    public void validateNotExistentByName(final String interestName) {
+    private void validateNotExistentByName(final String interestName) {
         if (interestRepository.existsByName(interestName)) {
             throw new InvalidDomainException(ALREADY_EXIST_INTEREST);
         }
diff --git a/src/test/java/daybyquest/interest/domain/InterestTest.java b/src/test/java/daybyquest/interest/domain/InterestTest.java
new file mode 100644
index 0000000..5301e6d
--- /dev/null
+++ b/src/test/java/daybyquest/interest/domain/InterestTest.java
@@ -0,0 +1,18 @@
+package daybyquest.interest.domain;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import daybyquest.global.error.exception.InvalidDomainException;
+import daybyquest.image.vo.Image;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class InterestTest {
+
+    @ParameterizedTest
+    @ValueSource(strings = {"", "일이삼사오육칠팔구십일이삼사오육칠팔구십일"})
+    void 이름이_1에서_20글자가_아니면_예외를_던진다(final String name) {
+        assertThatThrownBy(() -> new Interest(name, new Image("사진")))
+                .isInstanceOf(InvalidDomainException.class);
+    }
+}
diff --git a/src/test/java/daybyquest/interest/domain/InterestsTest.java b/src/test/java/daybyquest/interest/domain/InterestsTest.java
new file mode 100644
index 0000000..05e5450
--- /dev/null
+++ b/src/test/java/daybyquest/interest/domain/InterestsTest.java
@@ -0,0 +1,97 @@
+package daybyquest.interest.domain;
+
+import static daybyquest.support.fixture.InterestFixtures.INTERST_1;
+import static daybyquest.support.fixture.InterestFixtures.INTERST_2;
+import static daybyquest.support.fixture.InterestFixtures.INTERST_3;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertAll;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.BDDMockito.then;
+
+import daybyquest.global.error.exception.InvalidDomainException;
+import daybyquest.global.error.exception.NotExistInterestException;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+public class InterestsTest {
+
+    @Mock
+    private InterestRepository interestRepository;
+
+    @InjectMocks
+    private Interests interests;
+
+    @Test
+    void 이름_중복_검사를_하고_저장한다() {
+        // given & when
+        interests.save(INTERST_1.생성());
+
+        // then
+        assertAll(() -> {
+            then(interestRepository).should().existsByName(INTERST_1.name);
+            then(interestRepository).should().save(any(Interest.class));
+        });
+    }
+
+    @Test
+    void 저장_시_이름이_이미_있다면_예외를_던진다() {
+        // given
+        given(interestRepository.existsByName(INTERST_1.name)).willReturn(true);
+
+        // then
+        assertThatThrownBy(() -> interests.save(INTERST_1.생성()))
+                .isInstanceOf(InvalidDomainException.class);
+    }
+
+    @Test
+    void 이름을_통해_존재_여부를_검증한다() {
+        // given
+        given(interestRepository.existsByName(INTERST_1.name)).willReturn(true);
+
+        // when
+        interests.validateInterest(INTERST_1.name);
+
+        // then
+        then(interestRepository).should().existsByName(INTERST_1.name);
+    }
+
+    @Test
+    void 이름을_통해_존재_여부를_검증_시_존재한다면_에외를_던진다() {
+        // given & when & then
+        assertThatThrownBy(() -> interests.validateInterest(INTERST_1.name))
+                .isInstanceOf(NotExistInterestException.class);
+    }
+
+    @Test
+    void 여러_이름을_통해_존재_여부를_검증한다() {
+        // given
+        final List<String> names = List.of(INTERST_1.name, INTERST_2.name, INTERST_3.name);
+        final List<Interest> expected = List.of(INTERST_1.생성(), INTERST_2.생성(), INTERST_3.생성());
+        given(interestRepository.findAllByNameIn(names)).willReturn(expected);
+
+        // when
+        interests.validateInterests(names);
+
+        // then
+        then(interestRepository).should().findAllByNameIn(names);
+    }
+
+
+    @Test
+    void 여러_이름을_통해_존재_여부를_검증_시_하나라도_없다면_예외를_던진다() {
+        // given
+        final List<String> names = List.of(INTERST_1.name, INTERST_2.name, INTERST_3.name);
+        final List<Interest> expected = List.of(INTERST_1.생성(), INTERST_2.생성());
+        given(interestRepository.findAllByNameIn(names)).willReturn(expected);
+
+        // when
+        assertThatThrownBy(() -> interests.validateInterests(names))
+                .isInstanceOf(NotExistInterestException.class);
+    }
+}
diff --git a/src/test/java/daybyquest/support/fixture/InterestFixtures.java b/src/test/java/daybyquest/support/fixture/InterestFixtures.java
new file mode 100644
index 0000000..7023753
--- /dev/null
+++ b/src/test/java/daybyquest/support/fixture/InterestFixtures.java
@@ -0,0 +1,29 @@
+package daybyquest.support.fixture;
+
+import daybyquest.image.vo.Image;
+import daybyquest.interest.domain.Interest;
+
+public enum InterestFixtures {
+
+    INTERST_1("관심사1", "관심사사진1"),
+    INTERST_2("관심사2", "관심사사진2"),
+    INTERST_3("관심사3", "관심사사진3"),
+    INTERST_4("관심사4", "관심사사진4");
+
+    public final String name;
+
+    public final String imageIdentifier;
+
+    InterestFixtures(final String name, final String imageIdentifier) {
+        this.name = name;
+        this.imageIdentifier = imageIdentifier;
+    }
+
+    public Interest 생성() {
+        return new Interest(name, 사진());
+    }
+
+    public Image 사진() {
+        return new Image(imageIdentifier);
+    }
+}