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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.reflection;
import org.junit.Test;
import java.util.Optional;
import static com.yahoo.text.StringUtilities.quote;
import static com.yahoo.reflection.Casting.cast;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
public class CastingTest {
@Test
public void valid_cast_gives_present_optional() {
Object objectToCast = 12;
Optional<Integer> value = cast(Integer.class, objectToCast);
assertTrue("Value is not present", value.isPresent());
assertSame(objectToCast, value.get());
}
@Test
public void invalid_cast_gives_empty_optional() {
Object objectToCast = "string";
Optional<Integer> value = cast(Integer.class, objectToCast);
assertTrue("Value is present", !value.isPresent());
}
@Test(expected = IllegalArgumentException.class)
public void cast_sample_usage() {
Object objectToCast = "illegal";
int result = cast(Integer.class, objectToCast).
filter(i -> !i.equals(0)).
orElseThrow(() -> new IllegalArgumentException("Expected non-zero integer, got " + quote(objectToCast)));
}
}
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