### Question:
VectorMath { public static double norm(float[] x) { double total = 0.0; for (float f : x) { total += (double) f * f; } return Math.sqrt(total); } 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 testNormF() { assertEquals(0.0, VectorMath.norm(new float[] {0.0f}), FLOAT_EPSILON); assertEquals(3.674234614174767, VectorMath.norm(VEC1), FLOAT_EPSILON); assertEquals(10.72800074571213, VectorMath.norm(VEC2), FLOAT_EPSILON); }
@Test public void testNormD() { assertEquals(0.0, VectorMath.norm(new double[] {0.0}), DOUBLE_EPSILON); assertEquals(3.674234614174767, VectorMath.norm(VEC1D), DOUBLE_EPSILON); assertEquals(10.72800074571213, VectorMath.norm(VEC2D), DOUBLE_EPSILON); }