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package bjc;
import java.util.*;
import static org.junit.Assert.*;
/**
* Utility methods for doing testing
*
* @author Ben Culkin
*/
public class TestUtils {
/**
* Assert an iterator provides a particular sequence of values.
*
* @param src
* The iterator to pull values from.
* @param vals
* The values to expect from the iterator.
*/
@SafeVarargs
public static <T> void assertIteratorEquals(Iterator<T> src, T... vals) {
for (int i = 0; i < vals.length; i++) {
if (src.hasNext()) {
assertEquals(vals[i], src.next());
} else {
String msg = String.format("not enough values: got %d, wanted %d",
i, vals.length);
assertTrue(msg, false);
}
}
}
/**
* Assert an iterator provides a particular sequence of values.
*
* @param src
* The iterator to pull values from.
* @param hasMore
* The expected value of hasNext for the iterator.
* @param vals
* The values to expect from the iterator.
*/
@SafeVarargs
public static <T> void assertIteratorEquals(boolean hasMore, Iterator<T> src, T... vals) {
/*
* @NOTE
*
* Even though it's awkward, the boolean has to come first.
* Otherwise, there are cases where the compiler will get
* confused as to what the right value for T is, and be unable
* to pick an overload.
*/
assertIteratorEquals(src, vals);
assertEquals("iterator not exhausted", hasMore, src.hasNext());
}
/**
* Assert an iterator provides a particular sequence of values.
*
* @param src
* The iterator to pull values from.
* @param vals
* The values to expect from the iterator.
*/
@SafeVarargs
public static <T> void assertIteratorSet(Iterator<T> src, T... vals) {
Set<T> s1 = new HashSet<>();
Set<T> s2 = new HashSet<>();
for (int i = 0; i < vals.length; i++) {
if (src.hasNext()) {
s1.add(vals[i]);
s2.add(src.next());
} else {
String msg = String.format("not enough values: got %d, wanted %d",
i, vals.length);
assertTrue(msg, false);
}
}
assertEquals(s1, s2);
}
/**
* Assert an iterator provides a particular sequence of values.
*
* @param src
* The iterator to pull values from.
* @param hasMore
* The expected value of hasNext for the iterator.
* @param vals
* The values to expect from the iterator.
*/
@SafeVarargs
public static <T> void assertIteratorSet(boolean hasMore, Iterator<T> src, T... vals) {
/*
* @NOTE
*
* Even though it's awkward, the boolean has to come first.
* Otherwise, there are cases where the compiler will get
* confused as to what the right value for T is, and be unable
* to pick an overload.
*/
assertIteratorSet(src, vals);
assertEquals("iterator not exhausted", hasMore, src.hasNext());
}
/**
* Assert that a list contains a certain set of values.
*
* @param src
* The list to read values from.
*
* @param exps
* The values to expect in the list.
*/
@SafeVarargs
public static <T> void assertListEquals(List<T> src, T... exps) {
assertEquals(exps.length, src.size());
int i = 0;
for (T act : src) {
T exp = exps[i++];
assertEquals(exp, act);
}
}
}
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