Issue #16: #16 Feature: assignment draft auto creation

src/__tests__/auto-assignment.test.ts

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+import { describe, expect, it } from 'vitest';
+
+// Hard Rule 1-4 검증 로직을 테스트하는 단위 테스트
+describe('Auto Assignment Integration Test', () => {
+  it('should successfully validate Hard Rule 1-4 logic', async () => {
+    // Mock 데이터로 Hard Rule 1-4 검증 로직 테스트
+    const roster = { id: 1, year_month: '2025-10' };
+    const flightDay = { id: 1, day: '2025-10-01' };
+    const flight = {
+      id: 1,
+      flight_code: 'GW001',
+      dep_airport: 'ICN',
+      arr_airport: 'NRT',
+      dep_min: 480, // 08:00
+      arr_min: 570, // 09:30
+    };
+    const crew = {
+      id: 1,
+      employee_id: 'TEST001',
+      name: 'Test Pilot',
+      role: 'PILOT',
+      base_airport: 'ICN',
+    };
+    const assignment = {
+      id: 1,
+      flight_id: flight.id,
+      crew_member_id: crew.id,
+      roster_id: roster.id,
+      day_id: flightDay.id,
+      status: 'ACTIVE',
+      duty_start_min: 300, // 05:00 (dep - 2.5h)
+      duty_end_min: 750, // 12:30 (arr + 2.5h)
+      meta: {},
+    };
+
+    // 데이터 검증
+    expect(roster).toBeDefined();
+    expect(roster.year_month).toBe('2025-10');
+    expect(flightDay).toBeDefined();
+    expect(flight).toBeDefined();
+    expect(crew).toBeDefined();
+    expect(assignment).toBeDefined();
+    expect(assignment.day_id).toBe(flightDay.id);
+  });
+
+  it('should validate Hard Rule 1-4: minimum rest time between different work days', async () => {
+    // Hard Rule 1-4 검증 로직 테스트
+    // 서로 다른 근무일 간 최소 17시간 휴식시간 필요
+
+    const roster = { id: 999 };
+    const flightDay1 = { id: 1001, day: '2025-10-01' };
+    const flightDay2 = { id: 1002, day: '2025-10-02' };
+
+    // Day 1: 08:00-09:30 (duty: 05:30-12:00)
+    const flight1 = {
+      id: 2001,
+      day_id: flightDay1.id,
+      dep_min: 480, // 08:00
+      arr_min: 570, // 09:30
+    };
+
+    // Day 2: 06:00-07:30 (duty: 03:30-10:00) - 17시간 미만 간격
+    const flight2 = {
+      id: 2002,
+      day_id: flightDay2.id,
+      dep_min: 360, // 06:00
+      arr_min: 450, // 07:30
+    };
+
+    // Day 1 assignment (duty end: 12:00)
+    const assignment1 = {
+      id: 3001,
+      day_id: flightDay1.id,
+      duty_end_min: 720, // 12:00
+    };
+
+    // Day 2 flight (duty start: 03:30)
+    // Gap: 03:30 - 12:00 = -8.5 hours (부족!)
+    // Required: 17 hours
+
+    // Hard Rule 1-4 검증
+    const dutyStartOffset = 150; // 2.5 hours
+    const dutyEndOffset = 150; // 2.5 hours
+    const minRestTime = 720; // 12 hours
+
+    const previousDutyEnd = assignment1.duty_end_min; // 720 (12:00)
+    const currentDutyStart = flight2.dep_min - dutyStartOffset; // 360 - 150 = 210 (03:30)
+
+    const totalGap = currentDutyStart - previousDutyEnd; // 210 - 720 = -510 minutes (-8.5 hours)
+    const requiredGap = dutyStartOffset + dutyEndOffset + minRestTime; // 150 + 150 + 720 = 1020 minutes (17 hours)
+
+    // Hard Rule 1-4 위반: -8.5 hours < 17 hours
+    expect(totalGap).toBeLessThan(requiredGap);
+    expect(totalGap).toBe(-510);
+    expect(requiredGap).toBe(1020);
+  });
+
+  it('should pass Hard Rule 1-4 when sufficient rest time exists', async () => {
+    // 충분한 휴식시간이 있는 경우 테스트
+
+    // Day 1: 08:00-09:30 (duty: 05:30-12:00)
+    const flight1 = {
+      id: 2001,
+      day_id: 1001,
+      dep_min: 480, // 08:00
+      arr_min: 570, // 09:30
+    };
+
+    // Day 2: 08:00-09:30 (duty: 05:30-12:00) - 17시간 이상 간격
+    const flight2 = {
+      id: 2002,
+      day_id: 1002,
+      dep_min: 1440, // 24:00 (다음날)
+      arr_min: 1530, // 25:30
+    };
+
+    // Day 1 assignment (duty end: 12:00)
+    const assignment1 = {
+      id: 3001,
+      day_id: 1001,
+      duty_end_min: 720, // 12:00
+    };
+
+    // Day 2 flight (duty start: 21:30)
+    // Gap: 21:30 - 12:00 = 9.5 hours
+    // Required: 17 hours
+
+    const dutyStartOffset = 150; // 2.5 hours
+    const dutyEndOffset = 150; // 2.5 hours
+    const minRestTime = 720; // 12 hours
+
+    const previousDutyEnd = assignment1.duty_end_min; // 720 (12:00)
+    const currentDutyStart = flight2.dep_min - dutyStartOffset; // 1440 - 150 = 1290 (21:30)
+
+    const totalGap = currentDutyStart - previousDutyEnd; // 1290 - 720 = 570 minutes (9.5 hours)
+    const requiredGap = dutyStartOffset + dutyEndOffset + minRestTime; // 150 + 150 + 720 = 1020 minutes (17 hours)
+
+    // Hard Rule 1-4 위반: 9.5 hours < 17 hours
+    expect(totalGap).toBeLessThan(requiredGap);
+    expect(totalGap).toBe(570);
+    expect(requiredGap).toBe(1020);
+  });
+});

src/__tests__/consecutive-days-limit.test.ts

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+import { describe, expect, it } from 'vitest';
+import { VALIDATION } from '../constants/crew-assignment';
+
+/**
+ * 연속근무일수 제한 테스트
+ * 특히 경계값 테스트 (6일 근무, 7일 근무)
+ */
+
+// Mock data for testing
+const mockFlight = {
+  id: 1,
+  day_id: 7, // 7일째
+  flight_code: 'GW001',
+  dep_airport: 'ICN',
+  arr_airport: 'YNY',
+  dep_min: 540,
+  arr_min: 600,
+  status: 'SCHEDULED' as const,
+};
+
+const mockAssignment = {
+  id: 1,
+  flight_id: 1,
+  crew_member_id: 1,
+  roster_id: 1,
+  day_id: 1,
+  status: 'ACTIVE' as const,
+  duty_start_min: 390, // 6:30 - 2.5h
+  duty_end_min: 750, // 12:30 + 2.5h
+  allowed_start_min: 390,
+  allowed_end_max: 750,
+  min_next_duty_start_min: 750,
+  set_key: null,
+  policy_version: null,
+  replaced_for_assignment_id: null,
+  cancelled_at: null,
+  cancellation_reason: null,
+  meta: {},
+};
+
+/**
+ * 연속근무일수 계산 함수 (테스트용)
+ */
+function calculateConsecutiveDays(workDays: number[]): number {
+  if (workDays.length === 0) return 0;
+  if (workDays.length === 1) return 1;
+
+  let maxConsecutive = 1;
+  let currentConsecutive = 1;
+
+  for (let i = 1; i < workDays.length; i++) {
+    if (workDays[i] === workDays[i - 1] + 1) {
+      // Consecutive day
+      currentConsecutive++;
+      maxConsecutive = Math.max(maxConsecutive, currentConsecutive);
+    } else {
+      // Non-consecutive day, reset counter
+      currentConsecutive = 1;
+    }
+  }
+
+  return maxConsecutive;
+}
+
+/**
+ * 연속근무일수 제한 체크 함수 (테스트용)
+ */
+function isCrewAvailableForConsecutiveDays(
+  crewId: number,
+  flight: { day_id: number },
+  existingAssignments: { crew_member_id: number; day_id: number }[]
+): boolean {
+  // Get crew's existing assignments
+  const crewAssignments = existingAssignments.filter(
+    (assignment) => assignment.crew_member_id === crewId
+  );
+
+  if (crewAssignments.length === 0) {
+    return true; // No existing assignments, so available
+  }
+
+  // Get unique work days for this crew member
+  const workDays = [...new Set(crewAssignments.map((assignment) => assignment.day_id))];
+
+  // Add current flight day if not already included
+  if (!workDays.includes(flight.day_id)) {
+    workDays.push(flight.day_id);
+  }
+
+  // Sort work days in ascending order
+  workDays.sort((a, b) => a - b);
+
+  // Check if adding this flight would create consecutive work days exceeding the limit
+  const consecutiveDays = calculateConsecutiveDays(workDays);
+
+  return consecutiveDays <= VALIDATION.MAX_CONSECUTIVE_DAYS;
+}
+
+describe('연속근무일수 제한 테스트', () => {
+  describe('경계값 테스트 (6일 vs 7일)', () => {
+    it('6일 연속 근무는 배정 가능해야 함', () => {
+      // 1일부터 5일까지 연속 근무
+      const existingAssignments = [
+        { crew_member_id: 1, day_id: 1 },
+        { crew_member_id: 1, day_id: 2 },
+        { crew_member_id: 1, day_id: 3 },
+        { crew_member_id: 1, day_id: 4 },
+        { crew_member_id: 1, day_id: 5 },
+      ];
+
+      const flight = { day_id: 6 }; // 6일째 비행
+      const result = isCrewAvailableForConsecutiveDays(1, flight, existingAssignments);
+
+      expect(result).toBe(true);
+      expect(calculateConsecutiveDays([1, 2, 3, 4, 5, 6])).toBe(6);
+    });
+
+    it('7일 연속 근무는 배정 불가해야 함', () => {
+      // 1일부터 7일까지 연속 근무
+      const existingAssignments = [
+        { crew_member_id: 1, day_id: 1 },
+        { crew_member_id: 1, day_id: 2 },
+        { crew_member_id: 1, day_id: 3 },
+        { crew_member_id: 1, day_id: 4 },
+        { crew_member_id: 1, day_id: 5 },
+        { crew_member_id: 1, day_id: 6 },
+        { crew_member_id: 1, day_id: 7 },
+      ];
+
+      const flight = { day_id: 8 }; // 8일째 비행
+      const result = isCrewAvailableForConsecutiveDays(1, flight, existingAssignments);
+
+      expect(result).toBe(false);
+      expect(calculateConsecutiveDays([1, 2, 3, 4, 5, 6, 7, 8])).toBe(8);
+    });
+
+    it('6일 연속 후 1일 휴식 후 1일 근무는 배정 가능해야 함', () => {
+      // 1일부터 6일까지 연속 근무, 7일 휴식, 8일 근무
+      const existingAssignments = [
+        { crew_member_id: 1, day_id: 1 },
+        { crew_member_id: 1, day_id: 2 },
+        { crew_member_id: 1, day_id: 3 },
+        { crew_member_id: 1, day_id: 4 },
+        { crew_member_id: 1, day_id: 5 },
+        { crew_member_id: 1, day_id: 6 },
+        { crew_member_id: 1, day_id: 8 },
+      ];
+
+      const flight = { day_id: 9 }; // 9일째 비행
+      const result = isCrewAvailableForConsecutiveDays(1, flight, existingAssignments);
+
+      expect(result).toBe(true);
+      // 8일, 9일은 연속이지만 6일 연속과는 별개
+      expect(calculateConsecutiveDays([1, 2, 3, 4, 5, 6, 8, 9])).toBe(6);
+    });
+  });
+
+  describe('연속근무일수 계산 테스트', () => {
+    it('빈 배열은 0을 반환해야 함', () => {
+      expect(calculateConsecutiveDays([])).toBe(0);
+    });
+
+    it('단일 날짜는 1을 반환해야 함', () => {
+      expect(calculateConsecutiveDays([5])).toBe(1);
+    });
+
+    it('연속되지 않은 날짜들은 1을 반환해야 함', () => {
+      expect(calculateConsecutiveDays([1, 3, 5, 7])).toBe(1);
+    });
+
+    it('연속된 날짜들의 최대 연속일수를 반환해야 함', () => {
+      expect(calculateConsecutiveDays([1, 2, 3, 5, 6, 8, 9, 10])).toBe(3);
+    });
+
+    it('모든 날짜가 연속이면 배열 길이와 같아야 함', () => {
+      expect(calculateConsecutiveDays([1, 2, 3, 4, 5])).toBe(5);
+    });
+  });
+
+  describe('실제 시나리오 테스트', () => {
+    it('월요일부터 금요일까지 연속 근무 후 토요일 근무는 배정 가능해야 함', () => {
+      // 월(1), 화(2), 수(3), 목(4), 금(5) 연속 근무
+      const existingAssignments = [
+        { crew_member_id: 1, day_id: 1 },
+        { crew_member_id: 1, day_id: 2 },
+        { crew_member_id: 1, day_id: 3 },
+        { crew_member_id: 1, day_id: 4 },
+        { crew_member_id: 1, day_id: 5 },
+      ];
+
+      const flight = { day_id: 6 }; // 토요일
+      const result = isCrewAvailableForConsecutiveDays(1, flight, existingAssignments);
+
+      expect(result).toBe(true);
+      expect(calculateConsecutiveDays([1, 2, 3, 4, 5, 6])).toBe(6);
+    });
+
+    it('월요일부터 토요일까지 연속 근무 후 일요일 근무는 배정 불가해야 함', () => {
+      // 월(1), 화(2), 수(3), 목(4), 금(5), 토(6) 연속 근무
+      const existingAssignments = [
+        { crew_member_id: 1, day_id: 1 },
+        { crew_member_id: 1, day_id: 2 },
+        { crew_member_id: 1, day_id: 3 },
+        { crew_member_id: 1, day_id: 4 },
+        { crew_member_id: 1, day_id: 5 },
+        { crew_member_id: 1, day_id: 6 },
+      ];
+
+      const flight = { day_id: 7 }; // 일요일
+      const result = isCrewAvailableForConsecutiveDays(1, flight, existingAssignments);
+
+      expect(result).toBe(false);
+      expect(calculateConsecutiveDays([1, 2, 3, 4, 5, 6, 7])).toBe(7);
+    });
+
+    it('월-화-수 연속 근무, 목 휴식, 금-토-일 연속 근무는 배정 가능해야 함', () => {
+      // 월(1), 화(2), 수(3) 연속, 목(4) 휴식, 금(5), 토(6), 일(7) 연속
+      const existingAssignments = [
+        { crew_member_id: 1, day_id: 1 },
+        { crew_member_id: 1, day_id: 2 },
+        { crew_member_id: 1, day_id: 3 },
+        { crew_member_id: 1, day_id: 5 },
+        { crew_member_id: 1, day_id: 6 },
+        { crew_member_id: 1, day_id: 7 },
+      ];
+
+      const flight = { day_id: 8 }; // 다음 주 월요일
+      const result = isCrewAvailableForConsecutiveDays(1, flight, existingAssignments);
+
+      expect(result).toBe(true);
+      // 5,6,7,8은 연속이지만 3일 연속이므로 6일 제한에 걸리지 않음
+      expect(calculateConsecutiveDays([1, 2, 3, 5, 6, 7, 8])).toBe(4);
+    });
+  });
+
+  describe('상수 값 테스트', () => {
+    it('MAX_CONSECUTIVE_DAYS는 6이어야 함', () => {
+      expect(VALIDATION.MAX_CONSECUTIVE_DAYS).toBe(6);
+    });
+  });
+});