tools/test/CoverageOutputGenerator/javatests/com/google/devtools/coverageoutputgenerator/LcovParserTest.java

// Copyright 2018 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.coverageoutputgenerator;

import static com.google.common.truth.Truth.assertThat;
import static com.google.devtools.coverageoutputgenerator.LcovMergerTestUtils.TRACEFILE1;
import static com.google.devtools.coverageoutputgenerator.LcovMergerTestUtils.TRACEFILE2;
import static com.google.devtools.coverageoutputgenerator.LcovMergerTestUtils.assertTracefile1;
import static com.google.devtools.coverageoutputgenerator.LcovMergerTestUtils.assertTracefile2;
import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.base.Joiner;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@LcovParser}. */
@RunWith(JUnit4.class)
public class LcovParserTest {

  @Test
  public void testParseInvalidTracefile() throws IOException {
    List<SourceFileCoverage> sourceFiles =
        LcovParser.parse(new ByteArrayInputStream("Invalid lcov tracefile".getBytes(UTF_8)));
    assertThat(sourceFiles).isEmpty();
  }

  @Test
  public void testParseTracefileWithOneSourcefile() throws IOException {
    List<SourceFileCoverage> sourceFiles =
        LcovParser.parse(
            new ByteArrayInputStream(Joiner.on("\n").join(TRACEFILE1).getBytes(UTF_8)));
    assertThat(sourceFiles).hasSize(1);
    assertTracefile1(sourceFiles.get(0));
  }

  @Test
  public void testParseTracefileWithTwoSourcefiles() throws IOException {
    List<String> tracefile2ModifiedLines = new ArrayList<>();
    tracefile2ModifiedLines.addAll(TRACEFILE2);
    tracefile2ModifiedLines.set(0, "SF:BSOME_OTHER_FILE_THAT_IS_NOT_MERGED");

    List<String> tracefileLines = new ArrayList<>();
    tracefileLines.addAll(TRACEFILE1);
    tracefileLines.addAll(tracefile2ModifiedLines);

    InputStream inputStream =
        new ByteArrayInputStream(Joiner.on("\n").join(tracefileLines).getBytes(UTF_8));
    List<SourceFileCoverage> sourceFiles = LcovParser.parse(inputStream);

    assertThat(sourceFiles).hasSize(2);
    assertTracefile1(sourceFiles.get(0));
    assertTracefile2(sourceFiles.get(1));
  }
}