| // Copyright (C) 2018 The Android Open Source Project |
| // |
| // 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 com.googlesource.gerrit.plugins.scripting.rules.utils; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import java.io.IOException; |
| import java.util.function.Supplier; |
| import org.junit.Test; |
| |
| /** |
| * Small tests to showcase the benefit of using the ThrowingSupplier class. Without it, the lambda |
| * method is overly complex, and code needs to be duplicated (or extracted, for instance, in a class |
| * named ThrowingSupplier). |
| */ |
| public class ThrowingSupplierTest { |
| |
| @Test |
| public void demoUsage() { |
| String message = doSomethingThrowingSupplier("Maxime", ThrowingSupplierTest::doWork); |
| |
| assertThat(message).isEqualTo("Hello, Maxime"); |
| } |
| |
| @Test |
| public void sameDemoWithoutThrowingSupplier() { |
| String message = |
| doSomethingSupplier( |
| "Maxime", |
| () -> { |
| try { |
| return doWork(); |
| } catch (IOException e) { |
| return "Unknown"; |
| } |
| }); |
| |
| assertThat(message).isEqualTo("Hello, Maxime"); |
| } |
| |
| private static String doSomethingThrowingSupplier( |
| String name, ThrowingSupplier<String, IOException> method) { |
| try { |
| return method.get() + name; |
| } catch (IOException e) { |
| return "Unknown"; |
| } |
| } |
| |
| private static String doSomethingSupplier(String name, Supplier<String> method) { |
| return method.get() + name; |
| } |
| |
| /** Simple method allowed to throw an exception */ |
| @SuppressWarnings("RedundantThrows") |
| private static String doWork() throws IOException { |
| return "Hello, "; |
| } |
| } |