russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
81 lines
2.9 KiB
Java
81 lines
2.9 KiB
Java
/*
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* Copyright (c) 2024, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @summary An example test that shows how to use the Generators library.
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* @modules java.base/jdk.internal.misc
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* @library /test/lib /
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* @run driver testlibrary_tests.generators.tests.ExampleTest
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*/
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package testlibrary_tests.generators.tests;
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import compiler.lib.generators.Generator;
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import static compiler.lib.generators.Generators.G;
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public class ExampleTest {
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static class FakeException extends RuntimeException {}
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static class UnderTest {
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private enum State { STAND_BY, FIRST, SECOND };
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private State state = State.STAND_BY;
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void doIt(int x) {
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state = switch (state) {
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case State.STAND_BY -> x == (1 << 10) + 3 ? State.FIRST : State.STAND_BY;
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case State.FIRST -> x == (1 << 5) - 2 ? State.SECOND : State.STAND_BY;
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case State.SECOND -> {
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if (x == (1 << 4)) throw new FakeException();
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yield State.STAND_BY;
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}
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};
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}
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}
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public static void main(String[] args) {
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// This test should print "Assertion triggered by special" (see the math below) but almost never
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// "Assertion triggered by uniform" as the chance of triggering is about 2^-96.
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try {
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test(G.uniformInts());
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} catch (FakeException e) {
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System.out.println("Assertion triggered by uniform");
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}
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try {
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// 408 ints => 1/408 * 1/408 * 1/408 => 1/67_917_312 => with 70_000_000 loop iterations we should trigger
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test(G.powerOfTwoInts(3));
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} catch (FakeException e) {
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System.out.println("Assertion triggered by special");
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}
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}
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public static void test(Generator<Integer> g) {
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UnderTest underTest = new UnderTest();
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for (int i = 0; i < 70_000_000 * 3; i++) {
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underTest.doIt(g.next());
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}
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}
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}
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