/* * Copyright 2018, OpenCensus Authors * * 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 io.opencensus.trace; import static com.google.common.truth.Truth.assertThat; import java.nio.charset.Charset; import org.junit.Rule; import org.junit.Test; import org.junit.rules.ExpectedException; import org.junit.runner.RunWith; import org.junit.runners.JUnit4; /** Unit tests for {@link io.opencensus.trace.LowerCaseBase16Encoding}. */ @RunWith(JUnit4.class) public class LowerCaseBase16EncodingTest { private static final Charset CHARSET = Charset.forName("UTF-8"); @Rule public ExpectedException thrown = ExpectedException.none(); @Test public void valid_EncodeDecode() { testEncoding("", ""); testEncoding("f", "66"); testEncoding("fo", "666f"); testEncoding("foo", "666f6f"); testEncoding("foob", "666f6f62"); testEncoding("fooba", "666f6f6261"); testEncoding("foobar", "666f6f626172"); } @Test public void invalidDecodings_UnrecongnizedCharacters() { // These contain bytes not in the decoding. thrown.expect(IllegalArgumentException.class); thrown.expectMessage("Invalid character g"); LowerCaseBase16Encoding.decodeToBytes("efhg"); } @Test public void invalidDecodings_InvalidInputLength() { // Valid base16 strings always have an even length. thrown.expect(IllegalArgumentException.class); thrown.expectMessage("Invalid input length 3"); LowerCaseBase16Encoding.decodeToBytes("abc"); } @Test public void invalidDecodings_InvalidInputLengthAndCharacter() { // These have a combination of invalid length and unrecognized characters. thrown.expect(IllegalArgumentException.class); thrown.expectMessage("Invalid input length 1"); LowerCaseBase16Encoding.decodeToBytes("?"); } private static void testEncoding(String decoded, String encoded) { testEncodes(decoded, encoded); testDecodes(encoded, decoded); } private static void testEncodes(String decoded, String encoded) { assertThat(LowerCaseBase16Encoding.encodeToString(decoded.getBytes(CHARSET))) .isEqualTo(encoded); } private static void testDecodes(String encoded, String decoded) { assertThat(LowerCaseBase16Encoding.decodeToBytes(encoded)).isEqualTo(decoded.getBytes(CHARSET)); } }