@Test
public void shouldReturnNullIfNoPage() {
Map<String, String> parameters = new HashMap<>();
Paginator paginator = new Paginator(parameters, scheme, parser);
PaginatedResponse paginatedResult =
new PaginatedResponse(
new JsonArray(),
new PaginatedResponseMeta(new Page(100, 10), null, new Page(90, 10), 10));
when(parser.parse(anyString())).thenReturn(paginatedResult);
paginator.nextPage();
PaginatedResponse lastPage = paginator.nextPage();
ArgumentCaptor<Page> optionCaptor = ArgumentCaptor.forClass(Page.class);
verify(scheme, times(1)).nextPage(eq(parameters), optionCaptor.capture());
Page paginationOption = optionCaptor.getValue();
assertEquals(100, paginationOption.getLimit());
assertEquals(0, paginationOption.getOffset());
assertNull(lastPage);
}
@Test
public void shouldOverrideDefaultLimitAndOffsetIfProvidedInParams() {
Map<String, String> parameters =
new HashMap<String, String>() {
{
put(Constants.OFFSET, "2000");
put(Constants.LIMIT, "1000");
}
};
Paginator paginator = new Paginator(parameters, scheme, parser);
when(scheme.nextPage(eq(parameters), any(Page.class))).thenReturn("testresponse");
when(parser.parse("testresponse"))
.thenReturn(new PaginatedResponse(null, new PaginatedResponseMeta(null, null, null, 0)));
paginator.nextPage();
paginator.nextPage();
ArgumentCaptor<Page> optionCaptor = ArgumentCaptor.forClass(Page.class);
verify(scheme).nextPage(eq(parameters), optionCaptor.capture());
assertEquals(2000, optionCaptor.getValue().getOffset());
assertEquals(1000, optionCaptor.getValue().getLimit());
}
@Test
public void shouldInitializePaginationOptionWithOffset0ForFirstPage() {
Map<String, String> parameters = new HashMap<>();
Paginator paginator = new Paginator(parameters, scheme, parser);
when(scheme.nextPage(eq(parameters), any(Page.class))).thenReturn("testresponse");
when(parser.parse("testresponse"))
.thenReturn(new PaginatedResponse(null, new PaginatedResponseMeta(null, null, null, 0)));
paginator.nextPage();
ArgumentCaptor<Page> optionCaptor = ArgumentCaptor.forClass(Page.class);
verify(scheme).nextPage(eq(parameters), optionCaptor.capture());
Page paginationOption = optionCaptor.getValue();
assertEquals(100, paginationOption.getLimit());
assertEquals(0, paginationOption.getOffset());
}
@Test
public void shouldFetchNextPage() {
Map<String, String> parameters = new HashMap<>();
Paginator paginator = new Paginator(parameters, scheme, parser);
PaginatedResponse paginatedResult =
new PaginatedResponse(
new JsonArray(), new PaginatedResponseMeta(null, new Page(100, 100), null, 0));
when(parser.parse(anyString())).thenReturn(paginatedResult);
paginator.nextPage();
paginator.nextPage();
ArgumentCaptor<Page> optionCaptor = ArgumentCaptor.forClass(Page.class);
verify(scheme, times(2)).nextPage(eq(parameters), optionCaptor.capture());
List<Page> allValues = optionCaptor.getAllValues();
assertEquals(2, allValues.size());
assertEquals(100, allValues.get(0).getLimit());
assertEquals(0, allValues.get(0).getOffset());
assertEquals(100, allValues.get(1).getLimit());
assertEquals(100, allValues.get(1).getOffset());
}