### Question:
Interpolations { public static Interpolation noInterpolation() { return noInterpolation; }  static Interpolation noInterpolation();  }### Answer:
@Test public void testNoInterpolation1() { double[] x = new double[] {0.0, 1.0, 2.0}; double[] y = new double[] {3.0, 4.0, 1.0}; double[] result = Interpolations.noInterpolation().interpolate(x, y, 3); assertEquals(3, result.length); assertArrayEquals(y, result, 0.000000000001); }
@Test public void testNoInterpolation2() { double[] x = new double[] {0.0, 1.0}; double[] y = new double[] {10.0, 4.0}; double[] result = Interpolations.noInterpolation().interpolate(x, y, 4); assertEquals(4, result.length); assertArrayEquals(new double[] {10.0, 10.0, 4.0, 4.0}, result, 0.000000000001); }
@Test public void testNoInterpolation3() { double[] x = new double[] {0.0, 1.0, 2.0}; double[] y = new double[] {3.0, 4.0, 1.0}; double[] result = Interpolations.noInterpolation().interpolate(x, y, 7); assertEquals(7, result.length); assertArrayEquals(new double[] {3.0, 3.0, 4.0, 4.0, 4.0, 1.0, 1.0}, result, 0.000000000001); }
@Test public void testNoInterpolation4() { double[] x = new double[] {0.0, 1.0, 1.5, 2.0}; double[] y = new double[] {3.0, 4.0, 2.0, 1.0}; double[] result = Interpolations.noInterpolation().interpolate(x, y, 5); assertEquals(5, result.length); assertArrayEquals(new double[] {3.0, 4.0, 4.0, 2.0, 1.0}, result, 0.000000000001); }
@Test public void testNoInterpolation5() { double[] x = new double[] {0.0, 0.1, 1.0, 1.5, 1.9, 2.0}; double[] y = new double[] {3.0, 10.0, 4.0, 2.0, 10.0, 1.0}; double[] result = Interpolations.noInterpolation().interpolate(x, y, 3); assertEquals(3, result.length); assertArrayEquals(new double[] {3.0, 4.0, 1.0}, result, 0.000000000001); }