X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=test%2Fjalview%2Fext%2Fandroid%2FSparseDoubleArrayTest.java;h=7d64a280e5958ec8db24070875df2ec8ea4f4cbf;hb=80ff57c095b792b8e8e123ddb0eff4d1780d6cbd;hp=58c36e6cea2a9561a14dc79094a4ebb38689aecc;hpb=48388af41cf8ebbbbfecc7b354ab6c32d8af7bac;p=jalview.git

diff --git a/test/jalview/ext/android/SparseDoubleArrayTest.java b/test/jalview/ext/android/SparseDoubleArrayTest.java
index 58c36e6..7d64a28 100644
--- a/test/jalview/ext/android/SparseDoubleArrayTest.java
+++ b/test/jalview/ext/android/SparseDoubleArrayTest.java
@@ -36,4 +36,18 @@ public class SparseDoubleArrayTest
     s.add(12, 9.8d);
     assertEquals(s.get(12), 9.8d);
   }
+
+  @Test
+  public void testDivide()
+  {
+    double delta = 1.0e-10;
+    double[] d = new double[] { 0d, 2.4d, 1.2d, 0d, -4.8d, -3.6d };
+    SparseDoubleArray s = new SparseDoubleArray(d);
+    assertEquals(s.divide(0, 1d), 0d); // no such entry
+    assertEquals(s.divide(2, 0d), 0d); // zero divisor
+    assertEquals(s.divide(1, 2d), 1.2d, delta); // + / +
+    assertEquals(s.divide(2, -2d), -0.6d, delta); // + / -
+    assertEquals(s.divide(4, 3d), -1.6d, delta); // - / +
+    assertEquals(s.divide(5, -3d), 1.2d, delta); // - / -
+  }
 }