### Question:
Classifier { public boolean isValidAndMinimal(double similarity) { return isValid(similarity) && isMinimal(similarity); }  boolean isValidAndMinimal(double similarity);  }### Answer:
@Test public void testLowerBound() { Classifier classifier = new Classifier(0.0, 0.5); assertThat(classifier.isValidAndMinimal(0.6)).isTrue(); assertThat(classifier.isValidAndMinimal(0.5)).isFalse(); }
@Test public void testMinThreshold() { Classifier classifier = new Classifier(0.5, 0.0); assertThat(classifier.isValidAndMinimal(0.5)).isTrue(); assertThat(classifier.isValidAndMinimal(0.4)).isFalse(); }
@Test public void testMinThresholdAndLowerBound() { Classifier classifier = new Classifier(0.5, 0.5); assertThat(classifier.isValidAndMinimal(0.6)).isTrue(); assertThat(classifier.isValidAndMinimal(0.5)).isFalse(); }