diff --git a/src/test/java/com/slotline/availability/AvailabilityRulesTest.java b/src/test/java/com/slotline/availability/AvailabilityRulesTest.java
new file mode 100644
index 0000000..c98a967
--- /dev/null
+++ b/src/test/java/com/slotline/availability/AvailabilityRulesTest.java
@@ -0,0 +1,111 @@
+package com.slotline.availability;
+
+import com.slotline.availability.dto.BlackoutRequest;
+import com.slotline.availability.dto.OperatingHoursRequest;
+import com.slotline.common.AvailabilityViolationException;
+import com.slotline.organization.Organization;
+import com.slotline.organization.OrganizationRepository;
+import com.slotline.reservation.ReservationService;
+import com.slotline.reservation.dto.ReservationRequest;
+import com.slotline.resource.ResourceService;
+import com.slotline.resource.dto.ResourceRequest;
+import com.slotline.security.AuthenticatedUser;
+import com.slotline.user.Role;
+import com.slotline.user.User;
+import com.slotline.user.UserRepository;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.security.crypto.password.PasswordEncoder;
+
+import java.time.Instant;
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+@SpringBootTest
+class AvailabilityRulesTest {
+
+    private static final ZoneId zone = ZoneId.of("Europe/Warsaw");
+    private static final LocalDate monday = LocalDate.of(2026, 9, 7);
+
+    @Autowired
+    private OrganizationRepository organizations;
+
+    @Autowired
+    private UserRepository users;
+
+    @Autowired
+    private PasswordEncoder passwordEncoder;
+
+    @Autowired
+    private ResourceService resourceService;
+
+    @Autowired
+    private AvailabilityService availabilityService;
+
+    @Autowired
+    private ReservationService reservationService;
+
+    @Test
+    void operatingHoursAndBufferGovernBooking() {
+        AuthenticatedUser actor = tenant("availability-hours");
+        Long resourceId = resourceService.create(actor.organizationId(),
+                new ResourceRequest("Studio", "with hours", zone.getId(), 30)).id();
+        availabilityService.replaceOperatingHours(actor.organizationId(), resourceId,
+                List.of(new OperatingHoursRequest(monday.getDayOfWeek(), LocalTime.of(9, 0), LocalTime.of(17, 0))));
+
+        assertThatCode(() -> reservationService.create(actor,
+                new ReservationRequest(resourceId, at(monday, 10, 0), at(monday, 11, 0))))
+                .doesNotThrowAnyException();
+
+        assertThatThrownBy(() -> reservationService.create(actor,
+                new ReservationRequest(resourceId, at(monday, 11, 15), at(monday, 12, 0))))
+                .isInstanceOf(AvailabilityViolationException.class);
+
+        assertThatThrownBy(() -> reservationService.create(actor,
+                new ReservationRequest(resourceId, at(monday, 18, 0), at(monday, 19, 0))))
+                .isInstanceOf(AvailabilityViolationException.class);
+
+        LocalDate closedDay = monday.plusDays(1);
+        assertThatThrownBy(() -> reservationService.create(actor,
+                new ReservationRequest(resourceId, at(closedDay, 10, 0), at(closedDay, 11, 0))))
+                .isInstanceOf(AvailabilityViolationException.class);
+    }
+
+    @Test
+    void blackoutRangeBlocksBooking() {
+        AuthenticatedUser actor = tenant("availability-blackout");
+        Long resourceId = resourceService.create(actor.organizationId(),
+                new ResourceRequest("Court", "blacked out", zone.getId(), 0)).id();
+        availabilityService.addBlackout(actor.organizationId(), resourceId,
+                new BlackoutRequest(monday, monday, "maintenance"));
+
+        assertThatThrownBy(() -> reservationService.create(actor,
+                new ReservationRequest(resourceId, at(monday, 10, 0), at(monday, 11, 0))))
+                .isInstanceOf(AvailabilityViolationException.class);
+
+        LocalDate freeDay = monday.plusDays(3);
+        assertThatCode(() -> reservationService.create(actor,
+                new ReservationRequest(resourceId, at(freeDay, 10, 0), at(freeDay, 11, 0))))
+                .doesNotThrowAnyException();
+    }
+
+    private AuthenticatedUser tenant(String slug) {
+        Organization organization = organizations.save(new Organization(slug, slug, Instant.now()));
+        User user = users.save(new User(organization.getId(), slug + "-user",
+                passwordEncoder.encode("password123"), Role.USER, Instant.now()));
+        assertThat(monday.getDayOfWeek().getValue()).isEqualTo(1);
+        return new AuthenticatedUser(user.getId(), user.getUsername(), user.getRole(), organization.getId());
+    }
+
+    private static Instant at(LocalDate date, int hour, int minute) {
+        return ZonedDateTime.of(date, LocalTime.of(hour, minute), zone).toInstant();
+    }
+}