@Test
public void singleNullValue() {
when(cursor.getCount()).thenReturn(1);
when(cursor.moveToFirst()).thenReturn(true);
Fetcher fetcher = Fetcher.of(cursor);
Optional<String> result = fetcher.toValue(Converter.STRING);
assertFalse("We should not have a value", result.isPresent());
}
@Test
public void emptyCursorToValue() {
when(cursor.getCount()).thenReturn(0);
Fetcher fetcher = Fetcher.of(cursor);
Optional<String> result = fetcher.toValue(Converter.STRING);
assertFalse(result.isPresent());
verify(cursor).close();
}
@Test
public void emptyCursorToList() {
when(cursor.getCount()).thenReturn(0);
Fetcher fetcher = Fetcher.of(cursor);
List<String> result = fetcher.toList(Converter.STRING);
assertThat(result).isNotNull().isEmpty();
verify(cursor).close();
}
@Test
public void singleNullValueToList() {
when(cursor.getCount()).thenReturn(1);
when(cursor.moveToNext()).thenReturn(true, false);
when(cursor.getString(0)).thenReturn(null);
Fetcher fetcher = Fetcher.of(cursor);
List<String> result = fetcher.toList(Converter.STRING);
assertThat(result).isNotNull().hasSize(1).contains((String) null);
}
@Test
public void singleValueToValue() {
when(cursor.getCount()).thenReturn(1);
when(cursor.moveToFirst()).thenReturn(true);
when(cursor.getInt(0)).thenReturn(42);
Fetcher fetcher = Fetcher.of(cursor);
Optional<Integer> result = fetcher.toValue(Converter.INT);
assertTrue("We should have a value", result.isPresent());
assertThat(result.get()).isEqualTo(42);
}
@Test
public void nullCursor() {
Fetcher fetcher = Fetcher.of(null);
assertThat(fetcher.toList(Converter.STRING)).isNotNull().isEmpty();
assertThat(fetcher.toSet(Converter.STRING)).isNotNull().isEmpty();
assertThat(fetcher.toCollection(Converter.STRING, Collections.<String>emptyList()))
.isNotNull()
.isEmpty();
final Optional<String> result = fetcher.toValue(Converter.STRING);
assertThat(result).isNotNull();
assertFalse(result.isPresent());
}
@Test
public void skipNulls() {
when(cursor.getCount()).thenReturn(3);
when(cursor.moveToNext()).thenReturn(true, true, true, false);
when(cursor.getString(0)).thenReturn("First", null, "Third");
Fetcher fetcher = Fetcher.of(cursor).skipNulls();
List<String> result = fetcher.toList(Converter.STRING);
assertThat(result)
.isNotNull()
.hasSize(2)
.contains("First", "Third")
.doesNotContain((String) null);
}
@Test
public void rxBindingSingleValue() {
when(cursor.getCount()).thenReturn(1);
when(cursor.moveToNext()).thenReturn(true, false);
when(cursor.getString(0)).thenReturn("Yo");
TestSubscriber<String> testSubscriber = new TestSubscriber<>();
Fetcher fetcher = Fetcher.of(cursor);
fetcher.subscribe(Converter.STRING, testSubscriber);
testSubscriber.requestMore(1);
testSubscriber.assertValueCount(1);
testSubscriber.assertValue("Yo");
}
@Test
public void countNonEmpty() {
when(cursor.getCount()).thenReturn(42);
assertThat(Fetcher.of(cursor).count()).isEqualTo(42);
verify(cursor).close();
}
@Test
public void countEmpty() {
assertThat(Fetcher.of(null).count()).isEqualTo(0);
assertThat(Fetcher.of(cursor).count()).isEqualTo(0);
verify(cursor).close();
}
