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Jasmine-style expect() for Java.

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package com.pivotallabs.greatexpectations.matchers;

import com.pivotallabs.greatexpectations.MatcherOf;
import java.util.Set;

@MatcherOf(value = Set.class, directObject = true)
public class SetMatcher, X, M extends SetMatcher> extends ObjectMatcher {
  public boolean toContain(X... expectedItems) {
    for (X expectedItem : expectedItems) {
      if (!actual.contains(expectedItem)) return false;
    }
    return true;
  }

  public boolean toContainExactly(X... expectedItems) {
    for (X x : expectedItems) {
      if (!actual.contains(x)) {
        return false;
      }
    }
    return actual.size() == expectedItems.length;
  }

  public boolean toBeEmpty() {
    return actual.isEmpty();
  }

  public boolean toNumber(int expectedCount) {
    return actual.size() == expectedCount;
  }
}