package org.assertj.core.extractor;
import static org.assertj.core.api.Assertions.*;
import org.assertj.core.test.Employee;
import org.assertj.core.test.ExpectedException;
import org.assertj.core.test.Name;
import org.assertj.core.util.introspection.IntrospectionError;
import org.junit.Rule;
import org.junit.Test;
public class ByNameSingleExtractorTest {
private static final Employee yoda = new Employee(1L, new Name("Yoda"), 800);;
@Rule
public ExpectedException thrown = ExpectedException.none();
@Test
public void should_extract_field_values_even_if_property_exist() {
Object extractedValues = idExtractor().extract(yoda);
assertThat(extractedValues).isEqualTo(1L);
}
@Test
public void should_extract_property_values_when_no_public_field_match_given_name() {
Object extractedValues = ageExtractor().extract(yoda);
assertThat(extractedValues).isEqualTo(800);
}
@Test
public void should_extract_pure_property_values() {
Object extractedValues = adultExtractor().extract(yoda);
assertThat(extractedValues).isEqualTo(true);
}
@Test
public void should_throw_error_when_no_property_nor_public_field_match_given_name() {
thrown.expect(IntrospectionError.class);
new ByNameSingleExtractor<Employee>("unknown").extract(yoda);
}
@Test
public void should_throw_exception_when_given_name_is_null() {
thrown.expectIllegalArgumentException("The name of the field/property to read should not be null");
new ByNameSingleExtractor<Employee>(null).extract(yoda);
}
@Test
public void should_throw_exception_when_given_name_is_empty() {
thrown.expectIllegalArgumentException("The name of the field/property to read should not be empty");
new ByNameSingleExtractor<Employee>("").extract(yoda);
}
@Test
public void should_fallback_to_field_if_exception_has_been_thrown_on_property_access() throws Exception {
Object extractedValue = nameExtractor().extract(employeeWithBrokenName("Name"));
assertThat(extractedValue).isEqualTo(new Name("Name"));
}
@Test
public void should_prefer_properties_over_fields() throws Exception {
Object extractedValue = nameExtractor().extract(employeeWithOverridenName("Overriden Name"));
assertThat(extractedValue).isEqualTo(new Name("Overriden Name"));
}
@Test
public void should_throw_exception_if_property_cannot_be_extracted_due_to_runtime_exception_during_property_access()
throws Exception {
thrown.expect(IntrospectionError.class);
Employee employee = brokenEmployee();
adultExtractor().extract(employee);
}
@Test
public void should_throw_exception_if_no_object_is_given() throws Exception {
thrown.expect(IllegalArgumentException.class);
idExtractor().extract(null);
}
private Employee employeeWithBrokenName(String name) {
return new Employee(1L, new Name(name), 0) {
@Override
public Name getName() {
throw new IllegalStateException();
}
};
}
private Employee employeeWithOverridenName(final String overridenName) {
return new Employee(1L, new Name("Name"), 0) {
@Override
public Name getName() {
return new Name(overridenName);
}
};
}
private Employee brokenEmployee() {
return new Employee() {
@Override
public boolean isAdult() {
throw new IllegalStateException();
}
};
}
private ByNameSingleExtractor<Employee> idExtractor() {
return new ByNameSingleExtractor<Employee>("id");
}
private ByNameSingleExtractor<Employee> ageExtractor() {
return new ByNameSingleExtractor<Employee>("age");
}
private ByNameSingleExtractor<Employee> adultExtractor() {
return new ByNameSingleExtractor<Employee>("adult");
}
private ByNameSingleExtractor<Employee> nameExtractor() {
return new ByNameSingleExtractor<Employee>("name");
}
}