Add tests for Uniform Noise op

Author: gselzer

src/test/java/net/imagej/ops/filter/addUniformNoise/AddUniformNoiseTest.java

@@ -0,0 +1,107 @@
+
+package net.imagej.ops.filter.addUniformNoise;
+
+import net.imagej.ops.AbstractOpTest;
+import net.imagej.ops.Ops;
+import net.imagej.ops.special.computer.Computers;
+import net.imagej.ops.special.computer.UnaryComputerOp;
+import net.imglib2.type.numeric.integer.UnsignedByteType;
+import net.imglib2.type.numeric.real.DoubleType;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Tests {@link AddUniformNoiseRealType}.
+ *
+ * @author Gabriel Selzer
+ */
+public class AddUniformNoiseTest extends AbstractOpTest {
+
+	/**
+	 * Regression test for floating point values
+	 */
+	@Test
+	public void realTypeRegressionTest() {
+		UnaryComputerOp<DoubleType, DoubleType> noiseFunc = Computers.unary(ops,
+			Ops.Filter.AddUniformNoise.class, DoubleType.class, DoubleType.class, 0d,
+			2d);
+
+		double[] actual = new double[9];
+		DoubleType temp = new DoubleType();
+		for (int i = 0; i < actual.length; i++) {
+			noiseFunc.compute(new DoubleType(254), temp);
+			actual[i] = temp.getRealDouble();
+		}
+
+		double[] expected = { 254.10073053454738, 255.88056371733813,
+			255.15987104925694, 255.32176185269049, 254.92408976012726,
+			255.04150474558148, 255.4924837511821, 254.66400205149753,
+			254.45238896293924 };
+		Assert.assertArrayEquals(expected, actual, 1e-6);
+	}
+
+	/**
+	 * Ensures that the Op wraps correctly to the minimum of the data type when
+	 * clampOutput is set to false
+	 */
+	@Test
+	public void wrappingUpperEndRegressionTest() {
+		UnaryComputerOp<UnsignedByteType, UnsignedByteType> noiseFunc = Computers
+			.unary(ops, Ops.Filter.AddUniformNoise.class, UnsignedByteType.class,
+				UnsignedByteType.class, 0l, 3l, false);
+
+		int[] actual = new int[9];
+		UnsignedByteType temp = new UnsignedByteType();
+		for (int i = 0; i < actual.length; i++) {
+			noiseFunc.compute(new UnsignedByteType(254), temp);
+			actual[i] = temp.get();
+		}
+
+		int[] expected = { 0, 0, 1, 0, 255, 254, 0, 0, 0 };
+		Assert.assertArrayEquals(expected, actual);
+	}
+
+	/**
+	 * Ensures that the Op wraps correctly to the maximum of the data type when
+	 * clampOutput is set to false
+	 */
+	@Test
+	public void wrappingLowerEndRegressionTest() {
+		UnaryComputerOp<UnsignedByteType, UnsignedByteType> noiseFunc = Computers
+			.unary(ops, Ops.Filter.AddUniformNoise.class, UnsignedByteType.class,
+				UnsignedByteType.class, -3l, 0l, false);
+
+		int[] actual = new int[9];
+		UnsignedByteType temp = new UnsignedByteType();
+		for (int i = 0; i < actual.length; i++) {
+			noiseFunc.compute(new UnsignedByteType(0), temp);
+			actual[i] = temp.get();
+		}
+
+		int[] expected = { 255, 255, 0, 255, 254, 253, 255, 255, 255 };
+		Assert.assertArrayEquals(expected, actual);
+	}
+
+	/**
+	 * Ensures that the Op clamps to the minimum of the data type then clampOutput
+	 * is set to true
+	 */
+	@Test
+	public void clampingLowerEndRegressionTest() {
+		UnaryComputerOp<UnsignedByteType, UnsignedByteType> noiseFunc = Computers
+			.unary(ops, Ops.Filter.AddUniformNoise.class, UnsignedByteType.class,
+				UnsignedByteType.class, -3l, 0l);
+
+		int[] actual = new int[9];
+		UnsignedByteType temp = new UnsignedByteType();
+		for (int i = 0; i < actual.length; i++) {
+			noiseFunc.compute(new UnsignedByteType(0), temp);
+			actual[i] = temp.get();
+		}
+
+		int[] expected = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+		Assert.assertArrayEquals(expected, actual);
+	}
+
+}