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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.data;
import java.util.function.Function;
import org.junit.Assert;
import org.junit.Test;
/**
* @author Vaadin Ltd
*
*/
public class ResultTest {
@Test
public void testOk() {
String value = "foo";
Result<String> ok = Result.ok(value);
Assert.assertFalse(ok.isError());
Assert.assertFalse(ok.getMessage().isPresent());
ok.ifOk(v -> Assert.assertEquals(value, v));
ok.ifError(msg -> Assert.fail());
}
@Test
public void testError() {
String message = "foo";
Result<String> error = Result.error(message);
Assert.assertTrue(error.isError());
Assert.assertTrue(error.getMessage().isPresent());
error.ifOk(v -> Assert.fail());
error.ifError(msg -> Assert.assertEquals(message, msg));
Assert.assertEquals(message, error.getMessage().get());
}
@Test
public void of_noException() {
Result<String> result = Result.of(() -> "", exception -> null);
Assert.assertTrue(result instanceof SimpleResult);
Assert.assertFalse(((SimpleResult<?>) result).isError());
}
@Test
public void of_exception() {
String message = "foo";
Result<String> result = Result.<String> of(() -> {
throw new RuntimeException();
}, exception -> message);
Assert.assertTrue(result instanceof SimpleResult);
Assert.assertTrue(((SimpleResult<?>) result).isError());
Assert.assertEquals(message, result.getMessage().get());
}
@SuppressWarnings("serial")
@Test
public void map_norError_mapperIsApplied() {
Result<String> result = new SimpleResult<String>("foo", null) {
@Override
public <S> Result<S> flatMap(Function<String, Result<S>> mapper) {
return mapper.apply("foo");
}
};
Result<String> mapResult = result.map(value -> {
Assert.assertEquals("foo", value);
return "bar";
});
Assert.assertTrue(mapResult instanceof SimpleResult);
Assert.assertFalse(((SimpleResult<?>) mapResult).isError());
mapResult.ifOk(v -> Assert.assertEquals("bar", v));
}
@SuppressWarnings("serial")
@Test
public void map_error_mapperIsApplied() {
Result<String> result = new SimpleResult<String>("foo", null) {
@Override
public <S> Result<S> flatMap(Function<String, Result<S>> mapper) {
return new SimpleResult<S>(null, "bar");
}
};
Result<String> mapResult = result.map(value -> {
Assert.assertEquals("foo", value);
return "somevalue";
});
Assert.assertTrue(mapResult instanceof SimpleResult);
Assert.assertTrue(((SimpleResult<?>) mapResult).isError());
mapResult.ifError(msg -> Assert.assertEquals("bar", msg));
}
}
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