PageWrapperTest.java

class PageWrapperTest {

	private PageWrapper pageWrapper;

	@Mock
	private Page page;

	private Method initPaginationMethod;

	private int totalPages;

	@BeforeEach
	void beforeEach() {
		initMocks(this);
	}

	@Nested
	class PaginationSize_5 {

		private int paginationSize = 5;

		@DisplayName("トータルページ数がページネーション数より大きいとき")
		@TestFactory
		Stream<DynamicTest> InitPaginationPaginationSizeGreaterThanTotalPage() {
			totalPages = 10;
			Iterator<Integer> inputGenerator = IntStream.range(0, totalPages).iterator();

			Function<Integer, String> displayNameGenerator = (currentPageNumber) -> "currentPageNumber: " + currentPageNumber;

			ThrowingConsumer<Integer> testExecutor = (currentPageNumber) ->
					Assertions.assertAll(() -> {
						initPaginationMethod = PageWrapper.class.getDeclaredMethod("initPagination", int.class);
						initPaginationMethod.setAccessible(true);

						when(page.getNumber()).thenReturn(currentPageNumber);
						when(page.getTotalPages()).thenReturn(totalPages);

						pageWrapper = new PageWrapper(page, paginationSize);

						Integer[] showPages = getShowPages(currentPageNumber);
						assertThat(pageWrapper.getShowPages())
								.containsOnly(showPages);
					});

			return DynamicTest.stream(inputGenerator, displayNameGenerator, testExecutor);
		}

		@DisplayName("トータルページ数がページネーション数より小さいとき")
		@TestFactory
		Stream<DynamicTest> InitPaginationPaginationSizeLessThanTotalPage() {
			totalPages = 4;
			Iterator<Integer> inputGenerator = IntStream.range(0, totalPages).iterator();

			Function<Integer, String> displayNameGenerator = (currentPageNumber) -> "currentPageNumber: " + currentPageNumber;

			ThrowingConsumer<Integer> testExecutor = (currentPageNumber) ->
					Assertions.assertAll(() -> {
						initPaginationMethod = PageWrapper.class.getDeclaredMethod("initPagination", int.class);
						initPaginationMethod.setAccessible(true);

						when(page.getNumber()).thenReturn(currentPageNumber);
						when(page.getTotalPages()).thenReturn(totalPages);

						pageWrapper = new PageWrapper(page, paginationSize);

						Integer[] showPages = new Integer[] {0, 1, 2, 3, 4};
						assertThat(pageWrapper.getShowPages())
								.containsOnly(showPages);
					});

			return DynamicTest.stream(inputGenerator, displayNameGenerator, testExecutor);
		}

		private Integer[] getShowPages(int currentPageNumber) {
			List<Integer[]> showPages = new ArrayList<>();
			showPages.add(new Integer[] {0, 1, 2, 3, 4});
			showPages.add(new Integer[] {0, 1, 2, 3, 4});
			showPages.add(new Integer[] {0, 1, 2, 3, 4});
			showPages.add(new Integer[] {1, 2, 3, 4, 5});
			showPages.add(new Integer[] {2, 3, 4, 5, 6});
			showPages.add(new Integer[] {3, 4, 5, 6, 7});
			showPages.add(new Integer[] {4, 5, 6, 7, 8});
			showPages.add(new Integer[] {5, 6, 7, 8, 9});
			showPages.add(new Integer[] {5, 6, 7, 8, 9});
			showPages.add(new Integer[] {5, 6, 7, 8, 9});
			return showPages.get(currentPageNumber);
		}
	}

	@Nested
	class PaginationSize_6 {

		private int paginationSize = 6;

		@DisplayName("トータルページ数がページネーション数より大きいとき")
		@TestFactory
		Stream<DynamicTest> InitPaginationPaginationSizeGreaterThanTotalPage() {
			totalPages = 10;
			Iterator<Integer> inputGenerator = IntStream.range(0, totalPages).iterator();

			Function<Integer, String> displayNameGenerator = (currentPageNumber) -> "currentPageNumber: " + currentPageNumber;

			ThrowingConsumer<Integer> testExecutor = (currentPageNumber) ->
					Assertions.assertAll(() -> {
						initPaginationMethod = PageWrapper.class.getDeclaredMethod("initPagination", int.class);
						initPaginationMethod.setAccessible(true);
						totalPages = 10;

						when(page.getNumber()).thenReturn(currentPageNumber);
						when(page.getTotalPages()).thenReturn(totalPages);

						pageWrapper = new PageWrapper(page, paginationSize);

						Integer[] showPages = getShowPages(currentPageNumber);
						assertThat(pageWrapper.getShowPages())
								.containsOnly(showPages);
					});

			return DynamicTest.stream(inputGenerator, displayNameGenerator, testExecutor);
		}

		@DisplayName("トータルページ数がページネーション数より小さいとき")
		@TestFactory
		Stream<DynamicTest> InitPaginationPaginationSizeLessThanTotalPage() {
			totalPages = 4;
			Iterator<Integer> inputGenerator = IntStream.range(0, totalPages).iterator();

			Function<Integer, String> displayNameGenerator = (currentPageNumber) -> "currentPageNumber: " + currentPageNumber;

			ThrowingConsumer<Integer> testExecutor = (currentPageNumber) ->
					Assertions.assertAll(() -> {
						initPaginationMethod = PageWrapper.class.getDeclaredMethod("initPagination", int.class);
						initPaginationMethod.setAccessible(true);
						totalPages = 4;

						when(page.getNumber()).thenReturn(currentPageNumber);
						when(page.getTotalPages()).thenReturn(totalPages);

						pageWrapper = new PageWrapper(page, paginationSize);

						Integer[] showPages = new Integer[] {0, 1, 2, 3, 4, 5};
						assertThat(pageWrapper.getShowPages())
								.containsOnly(showPages);
					});

			return DynamicTest.stream(inputGenerator, displayNameGenerator, testExecutor);
		}

		private Integer[] getShowPages(int currentPageNumber) {
			List<Integer[]> showPages = new ArrayList<>();
			showPages.add(new Integer[] {0, 1, 2, 3, 4, 5});
			showPages.add(new Integer[] {0, 1, 2, 3, 4, 5});
			showPages.add(new Integer[] {0, 1, 2, 3, 4, 5});
			showPages.add(new Integer[] {1, 2, 3, 4, 5, 6});
			showPages.add(new Integer[] {2, 3, 4, 5, 6, 7});
			showPages.add(new Integer[] {3, 4, 5, 6, 7, 8});
			showPages.add(new Integer[] {4, 5, 6, 7, 8, 9});
			showPages.add(new Integer[] {4, 5, 6, 7, 8, 9});
			showPages.add(new Integer[] {4, 5, 6, 7, 8, 9});
			showPages.add(new Integer[] {4, 5, 6, 7, 8, 9});
			return showPages.get(currentPageNumber);
		}
	}
}