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JMockit Coverage is a code coverage tool with several metrics (line, path, data) capable of generating HTML reports. It is designed with ease of use in mind, avoiding the need for complex configuration. Instead, smart (but overridable) defaults are employed, such as the selection of which classes to consider for coverage, and where to find sources files for report generation.

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/*
 * Copyright (c) 2006-2015 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage.testRedundancy;

import java.lang.reflect.*;
import java.util.*;
import java.util.Map.*;

import org.jetbrains.annotations.*;

public final class TestCoverage
{
   @NotNull public static final TestCoverage INSTANCE = new TestCoverage();

   @NotNull private final Map testsToItemsCovered = new LinkedHashMap();
   @Nullable private Method currentTestMethod;

   private TestCoverage() {}

   public void setCurrentTestMethod(@Nullable Method testMethod)
   {
      if (testMethod != null) {
         testsToItemsCovered.put(testMethod, 0);
      }

      currentTestMethod = testMethod;
   }

   public void recordNewItemCoveredByTestIfApplicable(int previousExecutionCount)
   {
      if (previousExecutionCount == 0 && currentTestMethod != null) {
         Integer itemsCoveredByTest = testsToItemsCovered.get(currentTestMethod);
         testsToItemsCovered.put(currentTestMethod, itemsCoveredByTest == null ? 1 : itemsCoveredByTest + 1);
      }
   }

   @NotNull
   public List getRedundantTests()
   {
      List redundantTests = new ArrayList();

      for (Entry testAndItemsCovered : testsToItemsCovered.entrySet()) {
         Method testMethod = testAndItemsCovered.getKey();
         Integer itemsCovered = testAndItemsCovered.getValue();

         if (itemsCovered == 0) {
            redundantTests.add(testMethod);
         }
      }

      return redundantTests;
   }
}