### Question:
VectorMath { public static double dot(float[] x, float[] y) { int length = x.length; double dot = 0.0; for (int i = 0; i < length; i++) { dot += (double) x[i] * y[i]; } return dot; } private  VectorMath(); static double dot(float[] x, float[] y); static double norm(float[] x); static double norm(double[] x); static double cosineSimilarity(float[] x, float[] y, double normY); static double[] transposeTimesSelf(Collection<float[]> M); static double[] parseVector(String[] values); static float[] randomVectorF(int features, RandomGenerator random);  }### Answer:
@Test public void testDotFF() { assertEquals(5.35, VectorMath.dot(VEC1, VEC2), FLOAT_EPSILON); }
@Test public void testSmall() { float[] a = { 1.0e-24f }; assertEquals(1.0e-24 * 1.0e-24, VectorMath.dot(a, a)); }