ShampooRule.java

import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;

/** Got flaky tests? Shampoo them away. */
public final class ShampooRule implements TestRule {
  private final int iterations;

  public ShampooRule(int iterations) {
    if (iterations < 1) throw new IllegalArgumentException("iterations < 1: " + iterations);
    this.iterations = iterations;
  }

  @Override public Statement apply(final Statement base, Description description) {
    return new Statement() {
      @Override public void evaluate() throws Throwable {
        for (int i = 0; i < iterations; i++) {
          base.evaluate();
        }
      }
    };
  }
}