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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) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage.lines;

import org.jetbrains.annotations.*;

import mockit.coverage.*;
import mockit.external.asm4.*;

/**
 * Coverage data gathered for a branch inside a line of source code.
 */
public final class BranchCoverageData extends LineSegmentData
{
   private static final long serialVersionUID = 1003335601845442606L;

   // Static data:
   @NotNull public final transient Label jumpSource;
   @NotNull public final transient Label jumpTarget;

   // Runtime data (and static if any execution count is -1, meaning lack of the jump target):
   private int jumpExecutionCount;

   BranchCoverageData(@NotNull Label jumpSource, @NotNull Label jumpTarget)
   {
      this.jumpSource = jumpSource;
      this.jumpTarget = jumpTarget;
      jumpExecutionCount = -1;
      executionCount = -1;
   }

   public void setHasJumpTarget() { jumpExecutionCount = 0; }
   public void setHasNoJumpTarget() { executionCount = 0; }

   void registerJumpExecution(@Nullable CallPoint callPoint)
   {
      assert jumpExecutionCount >= 0 : "Illegal registerJumpExecution";
      jumpExecutionCount++;
      addCallPointIfAny(callPoint);
   }

   void registerNoJumpExecution(@Nullable CallPoint callPoint)
   {
      assert executionCount >= 0 : "Illegal registerNoJumpExecution";
      executionCount++;
      addCallPointIfAny(callPoint);
   }

   @Override
   public boolean isCovered()
   {
      return super.isCovered() || jumpExecutionCount > 0;
   }

   @Override
   public int getExecutionCount()
   {
      return executionCount > 0 ? executionCount : jumpExecutionCount > 0 ? jumpExecutionCount : 0;
   }

   void addCountsFromPreviousTestRun(@NotNull BranchCoverageData previousData)
   {
      addExecutionCountAndCallPointsFromPreviousTestRun(previousData);
      jumpExecutionCount += previousData.jumpExecutionCount;
   }

   @Override
   void reset()
   {
      super.reset();
      jumpExecutionCount = 0;
   }
}