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Asserts.java
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Asserts.java
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/*
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Nick Santos
* Google Inc.
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package com.google.javascript.rhino.testing;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static com.google.javascript.rhino.testing.TypeSubject.assertType;
import static com.google.javascript.rhino.testing.TypeSubject.types;
import com.google.common.collect.Iterables;
import com.google.javascript.rhino.ErrorReporter;
import com.google.javascript.rhino.jstype.JSType;
import java.util.Iterator;
import org.junit.Assert;
/**
* Helper methods for making assertions about the validity of types.
* @author nicksantos@google.com (Nick Santos)
*/
public class Asserts {
private Asserts() {} // all static
public static JSType assertResolvesToSame(JSType type) {
Assert.assertSame(type, assertValidResolve(type));
return type;
}
/** @return The resolved type */
public static JSType assertValidResolve(JSType type) {
ErrorReporter reporter = TestErrorReporter.forNoExpectedReports();
JSType resolvedType = type.resolve(reporter);
assertWithMessage("JSType#resolve should not affect object equality")
.about(types())
.that(resolvedType)
.isStructurallyEqualTo(type);
return resolvedType;
}
public static <T extends JSType, S extends JSType> void
assertTypeCollectionEquals(Iterable<T> a, Iterable<S> b) {
assertThat(b).hasSize(Iterables.size(a));
Iterator<T> aIterator = a.iterator();
Iterator<S> bIterator = b.iterator();
while (aIterator.hasNext()) {
assertType(bIterator.next()).isStructurallyEqualTo(aIterator.next());
}
}
/**
* For the given equivalent types, run all type operations that
* should have trivial solutions (getGreatestSubtype, isEquivalentTo, etc)
*/
public static void assertEquivalenceOperations(JSType a, JSType b) {
assertType(a).isStructurallyEqualTo(a);
assertType(b).isStructurallyEqualTo(a);
assertType(b).isStructurallyEqualTo(b);
Assert.assertTrue(a.isSubtypeOf(b));
Assert.assertTrue(a.isSubtypeOf(a));
Assert.assertTrue(b.isSubtypeOf(b));
Assert.assertTrue(b.isSubtypeOf(a));
assertType(a.getGreatestSubtype(b)).isStructurallyEqualTo(a);
assertType(a.getGreatestSubtype(a)).isStructurallyEqualTo(a);
assertType(b.getGreatestSubtype(b)).isStructurallyEqualTo(a);
assertType(b.getGreatestSubtype(a)).isStructurallyEqualTo(a);
assertType(a.getLeastSupertype(b)).isStructurallyEqualTo(a);
assertType(a.getLeastSupertype(a)).isStructurallyEqualTo(a);
assertType(b.getLeastSupertype(b)).isStructurallyEqualTo(a);
assertType(b.getLeastSupertype(a)).isStructurallyEqualTo(a);
Assert.assertTrue(a.canCastTo(b));
Assert.assertTrue(a.canCastTo(a));
Assert.assertTrue(b.canCastTo(b));
Assert.assertTrue(b.canCastTo(a));
}
/**
* Assert that the given function throws a particular throwable. This method is inspired by a
* similar API in JUnit 4.13, but the compiler is currently pinned on 4.12, which doesn't include
* it.
*/
public static void assertThrows(
Class<? extends Throwable> exceptionClass, ThrowingRunnable runnable) {
try {
runnable.run();
assertWithMessage("Did not get expected exception: %s", exceptionClass).fail();
} catch (Throwable expectedException) {
assertThat(expectedException).isInstanceOf(exceptionClass);
}
}
/** Functional interface for use with {@link #assertThrows}. */
@FunctionalInterface
public static interface ThrowingRunnable {
void run() throws Throwable;
}
}