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      1 package org.junit.runner;
      2 
      3 import org.junit.runners.Suite;
      4 import org.junit.runners.model.InitializationError;
      5 import org.junit.runners.model.RunnerBuilder;
      6 
      7 /**
      8  * Represents a strategy for computing runners and suites.
      9  * WARNING: this class is very likely to undergo serious changes in version 4.8 and
     10  * beyond.
     11  *
     12  * @since 4.6
     13  */
     14 public class Computer {
     15     /**
     16      * Returns a new default computer, which runs tests in serial order
     17      */
     18     public static Computer serial() {
     19         return new Computer();
     20     }
     21 
     22     /**
     23      * Create a suite for {@code classes}, building Runners with {@code builder}.
     24      * Throws an InitializationError if Runner construction fails
     25      */
     26     public Runner getSuite(final RunnerBuilder builder,
     27             Class<?>[] classes) throws InitializationError {
     28         return new Suite(new RunnerBuilder() {
     29             @Override
     30             public Runner runnerForClass(Class<?> testClass) throws Throwable {
     31                 return getRunner(builder, testClass);
     32             }
     33         }, classes);
     34     }
     35 
     36     /**
     37      * Create a single-class runner for {@code testClass}, using {@code builder}
     38      */
     39     protected Runner getRunner(RunnerBuilder builder, Class<?> testClass) throws Throwable {
     40         return builder.runnerForClass(testClass);
     41     }
     42 }
     43