@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 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());
}
