### Question:
Interpolation { public float interpolateX(float[] arr, float fracX, int offsetX) { if(fracX == 0) return arr[offsetX]; float[] interpX = new float[samplesX]; for (int i = 0; i < samplesX; i++) { interpX[i] = arr[adjustOffset(offsetX, arr.length, i)]; } return interpolateSampleX(interpX, fracX); } Interpolation(float[][] input);  Interpolation(float[][] input, int lenX, int lenY);  Interpolation(float[][] input, int lenX, int lenY, int samples); protected  Interpolation(); static Interpolation getInstance(Type type, float[][] input); abstract float interpolateSampleX(float[] samples, float fracX); float interpolateX(float[] arr, float fracX, int offsetX); float interpolateSampleY(float[] samples, float fracY); float interpolateY(float[] arr, float fracY, int offsetY); float interpolateSample(float[][] samples, float fracX, float fracY); float interpolate(float[][] arr, float fracX, float fracY, int offsetX, int offsetY); float interpolate(float[][] arr, float inputX, float inputY); static float getSigFig(float value); float[][] resize(int lenX, int lenY); float[][] crop(float top, float right, float bottom, float left); float[][] cropAndResize(int lenX, int lenY,
            float minX, float minY, float maxX, float maxY);  }### Answer:
@Test public void testInterpolateX() { float[] arr = new float[]{0,1,2,3,4,5,6}; assertEquals(0.0 , instance.interpolateX(arr, 0.0f , 0), 0.001); assertEquals(0.5 , instance.interpolateX(arr, 0.5f , 0), 0.001); assertEquals(1.3 , instance.interpolateX(arr, 0.3f , 1), 0.001); assertEquals(3.0 , instance.interpolateX(arr, 0.0f , 3), 0.001); assertEquals(4.99, instance.interpolateX(arr, 0.99f, 4), 0.001); assertEquals(5.5 , instance.interpolateX(arr, 0.5f , 5), 0.001); assertEquals(6.0 , instance.interpolateX(arr, 0.0f , 6), 0.001); try { instance.interpolateX(arr, 0.5f, 6); fail("Method should have thrown ArrayIndexOutOfBoundsException"); } catch (ArrayIndexOutOfBoundsException ex) { } try { instance.interpolateX(arr, 0.0f, 8); fail("Method should have thrown ArrayIndexOutOfBoundsException"); } catch (ArrayIndexOutOfBoundsException ex) { } }