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102 lines (85 loc) · 2.97 KB
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/*
* Copyright 2011-2016 David Karnok
*
* 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 ix;
import java.util.*;
import org.junit.Assert;
public enum IxTestHelper {
;
static String classOf(Object o) {
return o != null ? o.getClass().getSimpleName() : "null";
}
/**
* Asserts that the iterable produces the specified array of values and
* verifies if it honors the iterator contract.
* @param <T> the value type
* @param source the source sequence to validate
* @param values the values expected
*/
public static <T> void assertValues(Iterable<T> source, T... values) {
Iterator<T> a = source.iterator();
int i = 0;
for (;;) {
boolean b1 = a.hasNext();
boolean b2 = a.hasNext();
Assert.assertEquals("Inconsistent hasNext()", b1, b2);
if (!b1) {
break;
}
if (i == values.length) {
throw new AssertionError("The source is longer than " + values.length);
}
T t = a.next();
if (t instanceof Object[]) {
Assert.assertArrayEquals((Object[])values[i], (Object[])t);
} else {
Assert.assertEquals("index=" + i + ", expected class="
+ classOf(values[i])
+ ", actual class="
+ classOf(t), values[i], t);
}
i++;
}
if (i != values.length) {
throw new AssertionError("The source is shorter than " + values.length + ": " + i);
}
try {
a.next();
Assert.fail("The next() should have thrown a NoSuchElementException");
} catch (NoSuchElementException ex) {
// expected
}
}
/**
* Assert that calling remove() on the source's Iterator throws
* an UnsupportedOperationException.
* @param source the source to validate
*/
public static void assertNoRemove(Iterable<?> source) {
Iterator<?> it = source.iterator();
if (it.hasNext()) {
it.next();
try {
it.remove();
Assert.fail("Should have thrown UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
// expected
}
}
}
public static List<Integer> range(int start, int count) {
return Ix.range(start, count).collectToList().first();
}
}