Add (trivial) test.
diff --git a/commons-numbers-arrays/src/test/java/org/apache/commons/numbers/arrays/SafeNormTest.java b/commons-numbers-arrays/src/test/java/org/apache/commons/numbers/arrays/SafeNormTest.java
index 294f35c..2b9aafe 100644
--- a/commons-numbers-arrays/src/test/java/org/apache/commons/numbers/arrays/SafeNormTest.java
+++ b/commons-numbers-arrays/src/test/java/org/apache/commons/numbers/arrays/SafeNormTest.java
@@ -55,11 +55,27 @@
@Test
public void testSimple() {
final double[] v = new double[] {-0.9, 8.7, -6.5, -4.3, -2.1, 0, 1.2, 3.4, -5.6, 7.8, 9.0};
+ final double expected = direct(v);
+ Assertions.assertEquals(expected, SafeNorm.value(v), 0d);
+ }
+
+ @Test
+ public void testZero() {
+ final double[] v = new double[] {0, 0, 0, 0, 0};
+ Assertions.assertEquals(0d, SafeNorm.value(v), 0d);
+ }
+
+ /**
+ * Direct computation.
+ *
+ * @param v Array.
+ * @return the norm using direct summation.
+ */
+ private double direct(double[] v) {
double n = 0;
for (int i = 0; i < v.length; i++) {
n += v[i] * v[i];
}
- final double expected = Math.sqrt(n);
- Assertions.assertEquals(expected, SafeNorm.value(v), 0d);
+ return Math.sqrt(n);
}
}
