Base fixes and test harness

PortfolioJournalTests/Utilities/DateExtensionsTests.swift

@@ -0,0 +1,395 @@
+import XCTest
+@testable import PortfolioJournal
+
+final class DateExtensionsTests: XCTestCase {
+
+    // MARK: - Start of Day
+
+    func testStartOfDay_returnsDateAtMidnight() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        components.hour = 14
+        components.minute = 30
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.startOfDay
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.hour, .minute, .second], from: result)
+        XCTAssertEqual(resultComponents.hour, 0)
+        XCTAssertEqual(resultComponents.minute, 0)
+        XCTAssertEqual(resultComponents.second, 0)
+    }
+
+    // MARK: - Start of Month
+
+    func testStartOfMonth_returnsFirstDayOfMonth() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.startOfMonth
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.day, .month, .year], from: result)
+        XCTAssertEqual(resultComponents.day, 1)
+        XCTAssertEqual(resultComponents.month, 6)
+        XCTAssertEqual(resultComponents.year, 2024)
+    }
+
+    // MARK: - Start of Year
+
+    func testStartOfYear_returnsJanuaryFirst() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.startOfYear
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.day, .month, .year], from: result)
+        XCTAssertEqual(resultComponents.day, 1)
+        XCTAssertEqual(resultComponents.month, 1)
+        XCTAssertEqual(resultComponents.year, 2024)
+    }
+
+    // MARK: - End of Month
+
+    func testEndOfMonth_returnsLastDayOfMonth() {
+        // Given: June has 30 days
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.endOfMonth
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.day, .month], from: result)
+        XCTAssertEqual(resultComponents.day, 30)
+        XCTAssertEqual(resultComponents.month, 6)
+    }
+
+    func testEndOfMonth_handlesFebruaryInLeapYear() {
+        // Given: February 2024 (leap year) has 29 days
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 2
+        components.day = 10
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.endOfMonth
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.day, .month], from: result)
+        XCTAssertEqual(resultComponents.day, 29)
+        XCTAssertEqual(resultComponents.month, 2)
+    }
+
+    // MARK: - Same Day Comparison
+
+    func testIsSameDay_withSameDay_returnsTrue() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        components.hour = 10
+        let date1 = Calendar.current.date(from: components)!
+
+        components.hour = 20
+        let date2 = Calendar.current.date(from: components)!
+
+        // When/Then
+        XCTAssertTrue(date1.isSameDay(as: date2))
+    }
+
+    func testIsSameDay_withDifferentDays_returnsFalse() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date1 = Calendar.current.date(from: components)!
+
+        components.day = 16
+        let date2 = Calendar.current.date(from: components)!
+
+        // When/Then
+        XCTAssertFalse(date1.isSameDay(as: date2))
+    }
+
+    // MARK: - Same Month Comparison
+
+    func testIsSameMonth_withSameMonth_returnsTrue() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 1
+        let date1 = Calendar.current.date(from: components)!
+
+        components.day = 30
+        let date2 = Calendar.current.date(from: components)!
+
+        // When/Then
+        XCTAssertTrue(date1.isSameMonth(as: date2))
+    }
+
+    func testIsSameMonth_withDifferentMonths_returnsFalse() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date1 = Calendar.current.date(from: components)!
+
+        components.month = 7
+        let date2 = Calendar.current.date(from: components)!
+
+        // When/Then
+        XCTAssertFalse(date1.isSameMonth(as: date2))
+    }
+
+    // MARK: - Same Year Comparison
+
+    func testIsSameYear_withSameYear_returnsTrue() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 1
+        let date1 = Calendar.current.date(from: components)!
+
+        components.month = 12
+        let date2 = Calendar.current.date(from: components)!
+
+        // When/Then
+        XCTAssertTrue(date1.isSameYear(as: date2))
+    }
+
+    func testIsSameYear_withDifferentYears_returnsFalse() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        let date1 = Calendar.current.date(from: components)!
+
+        components.year = 2023
+        let date2 = Calendar.current.date(from: components)!
+
+        // When/Then
+        XCTAssertFalse(date1.isSameYear(as: date2))
+    }
+
+    // MARK: - Adding Time
+
+    func testAddingDays_addsCorrectly() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.adding(days: 10)
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.day, .month], from: result)
+        XCTAssertEqual(resultComponents.day, 25)
+    }
+
+    func testAddingDays_handlesNegativeValues() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.adding(days: -10)
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.day, .month], from: result)
+        XCTAssertEqual(resultComponents.day, 5)
+    }
+
+    func testAddingMonths_addsCorrectly() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.adding(months: 3)
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.month, .year], from: result)
+        XCTAssertEqual(resultComponents.month, 9)
+        XCTAssertEqual(resultComponents.year, 2024)
+    }
+
+    func testAddingYears_addsCorrectly() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let date = Calendar.current.date(from: components)!
+
+        // When
+        let result = date.adding(years: 2)
+
+        // Then
+        let resultComponents = Calendar.current.dateComponents([.year], from: result)
+        XCTAssertEqual(resultComponents.year, 2026)
+    }
+
+    // MARK: - Days Between
+
+    func testDaysBetween_calculatesCorrectly() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 1
+        let startDate = Calendar.current.date(from: components)!
+
+        components.day = 15
+        let endDate = Calendar.current.date(from: components)!
+
+        // When
+        let result = startDate.daysBetween(endDate)
+
+        // Then
+        XCTAssertEqual(result, 14)
+    }
+
+    func testDaysBetween_withReversedDates_returnsNegative() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 15
+        let startDate = Calendar.current.date(from: components)!
+
+        components.day = 1
+        let endDate = Calendar.current.date(from: components)!
+
+        // When
+        let result = startDate.daysBetween(endDate)
+
+        // Then
+        XCTAssertEqual(result, -14)
+    }
+
+    // MARK: - Months Between
+
+    func testMonthsBetween_calculatesCorrectly() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 1
+        components.day = 15
+        let startDate = Calendar.current.date(from: components)!
+
+        components.month = 6
+        let endDate = Calendar.current.date(from: components)!
+
+        // When
+        let result = startDate.monthsBetween(endDate)
+
+        // Then
+        XCTAssertEqual(result, 5)
+    }
+
+    // MARK: - Years Between
+
+    func testYearsBetween_calculatesCorrectly() {
+        // Given
+        var components = DateComponents()
+        components.year = 2020
+        components.month = 1
+        components.day = 1
+        let startDate = Calendar.current.date(from: components)!
+
+        components.year = 2024
+        let endDate = Calendar.current.date(from: components)!
+
+        // When
+        let result = startDate.yearsBetween(endDate)
+
+        // Then
+        XCTAssertEqual(result, 4.0, accuracy: 0.1)
+    }
+
+    // MARK: - DateRange Tests
+
+    func testDateRange_contains_withDateInRange_returnsTrue() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 1
+        let start = Calendar.current.date(from: components)!
+
+        components.day = 30
+        let end = Calendar.current.date(from: components)!
+
+        let range = DateRange(start: start, end: end)
+
+        components.day = 15
+        let testDate = Calendar.current.date(from: components)!
+
+        // When/Then
+        XCTAssertTrue(range.contains(testDate))
+    }
+
+    func testDateRange_contains_withDateOutsideRange_returnsFalse() {
+        // Given
+        var components = DateComponents()
+        components.year = 2024
+        components.month = 6
+        components.day = 1
+        let start = Calendar.current.date(from: components)!
+
+        components.day = 30
+        let end = Calendar.current.date(from: components)!
+
+        let range = DateRange(start: start, end: end)
+
+        components.month = 7
+        components.day = 15
+        let testDate = Calendar.current.date(from: components)!
+
+        // When/Then
+        XCTAssertFalse(range.contains(testDate))
+    }
+
+    func testDateRange_lastMonths_createsCorrectRange() {
+        // Given/When
+        let range = DateRange.last(months: 3)
+
+        // Then
+        let monthsDiff = range.start.monthsBetween(range.end)
+        XCTAssertEqual(monthsDiff, 3)
+    }
+}