fix: 빈 필터 토큰 null 바인딩 예외 방지

Author: mike7643

src/main/java/com/zimdugo/locker/application/filter/LockerSearchFilterFactory.java

@@ -1,6 +1,7 @@
 package com.zimdugo.locker.application.filter;
 
 import com.zimdugo.locker.domain.search.LockerSearchFilter;
+import java.util.Objects;
 import java.util.Set;
 import java.util.stream.Collectors;
 
@@ -18,16 +19,19 @@ public static LockerSearchFilter create(
             sizeTypes == null
                 ? Set.of()
                 : sizeTypes.stream()
+                    .filter(Objects::nonNull)
                     .map(LockerSizeFilterType::toDomain)
                     .collect(Collectors.toUnmodifiableSet()),
             indoorOutdoorTypes == null
                 ? Set.of()
                 : indoorOutdoorTypes.stream()
+                    .filter(Objects::nonNull)
                     .map(IndoorOutdoorFilterType::toDomain)
                     .collect(Collectors.toUnmodifiableSet()),
             lockerTypes == null
                 ? Set.of()
                 : lockerTypes.stream()
+                    .filter(Objects::nonNull)
                     .map(LockerFacilityFilterType::toDomain)
                     .collect(Collectors.toUnmodifiableSet())
         );

src/test/java/com/zimdugo/locker/application/filter/LockerSearchFilterFactoryTest.java

@@ -0,0 +1,24 @@
+package com.zimdugo.locker.application.filter;
+
+import com.zimdugo.locker.domain.search.LockerSearchFilter;
+import java.util.HashSet;
+import java.util.Set;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class LockerSearchFilterFactoryTest {
+
+    @Test
+    @DisplayName("빈 필터 토큰이 null로 바인딩되어도 무시하고 빈 필터로 처리한다")
+    void ignoresNullFilterTokens() {
+        Set<LockerSizeFilterType> sizeTypes = new HashSet<>();
+        sizeTypes.add(null);
+
+        LockerSearchFilter filter = LockerSearchFilterFactory.create(sizeTypes, null, null);
+
+        assertThat(filter.isEmpty()).isTrue();
+        assertThat(filter.sizeTypes()).isEmpty();
+    }
+}