@Test
public void should_return_null_elements_for_null_property_value() {
List<Employee> list = newArrayList(null, null);
Iterable<Integer> ages = PropertySupport.instance().propertyValues("ages", Integer.class, list);
assertThat(ages).containsExactly(null, null);
list = newArrayList(yoda, luke, null, null);
ages = PropertySupport.instance().propertyValues("age", Integer.class, list);
assertThat(ages).containsExactly(800, 26, null, null);
}
@Test
public void should_return_values_of_simple_property_as_objects() {
Iterable<Integer> ages =
PropertySupport.instance().propertyValues("age", Integer.class, employees);
Iterable<Object> agesAsObjects = PropertySupport.instance().propertyValues("age", employees);
assertEquals(agesAsObjects, ages);
Iterable<String> firstNames =
PropertySupport.instance().propertyValues("name.first", String.class, employees);
Iterable<Object> firstNamesAsObjects =
PropertySupport.instance().propertyValues("name.first", employees);
assertEquals(firstNamesAsObjects, firstNames);
}
@Test
public void should_extract_nested_property() {
String firstName = PropertySupport.instance().propertyValueOf("name.first", String.class, yoda);
assertThat(firstName).isEqualTo("Yoda");
yoda.name.first = null;
firstName = PropertySupport.instance().propertyValueOf("name.first", String.class, yoda);
assertThat(firstName).isNull();
yoda.name = null;
firstName = PropertySupport.instance().propertyValueOf("name.first", String.class, yoda);
assertThat(firstName).isNull();
}
@Test
public void should_return_values_of_property() {
List<Long> ids = new ArrayList<Long>();
ids.add(yoda.getId());
when(propertySupport.propertyValues(propertyName, Long.class, employees)).thenReturn(ids);
assertSame(ids, properties.from(employees));
}
@Test
public void should_return_properties_of_inner_class() {
VehicleFactory vehicleFactory = new VehicleFactory();
List<String> names =
PropertySupport.instance()
.propertyValues("name", String.class, vehicleFactory.getVehicles());
assertThat(names).containsExactly("Toyota", "Honda", "Audi");
}
@Test
public void should_return_values_of_simple_property() {
Iterable<Integer> ages =
PropertySupport.instance().propertyValues("age", Integer.class, employees);
assertThat(ages).containsExactly(800, 26);
}
@Test
public void should_return_empty_List_if_given_Iterable_is_empty() {
Iterable<Integer> ages =
PropertySupport.instance().propertyValues("ages", Integer.class, emptySet());
assertThat(ages).isEmpty();
}
@Test
public void should_return_property_from_superclass() {
assertThat(PropertySupport.instance().propertyValues("class", Class.class, employees))
.containsExactly(Employee.class, Employee.class);
}
@Test
public void should_extract_property() {
Integer age = PropertySupport.instance().propertyValue("age", Integer.class, yoda);
assertThat(age).isEqualTo(800);
}
@Test
public void should_throw_error_if_property_not_found() {
thrown.expect(IntrospectionError.class);
PropertySupport.instance().propertyValues("foo", Integer.class, employees);
}
@Test
public void should_return_values_of_nested_property() {
Iterable<String> firstNames =
PropertySupport.instance().propertyValues("name.first", String.class, employees);
assertThat(firstNames).containsExactly("Yoda", "Luke");
}