X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=test%2Fjalview%2Fext%2Fandroid%2FSparseDoubleArrayTest.java;fp=test%2Fjalview%2Fext%2Fandroid%2FSparseDoubleArrayTest.java;h=7d64a280e5958ec8db24070875df2ec8ea4f4cbf;hb=d5bcc3830eab04e6db816e1c2ad8fce1dc189612;hp=0000000000000000000000000000000000000000;hpb=3ebdd4e28382e38a181aae1eed71549f603f9025;p=jalview.git

diff --git a/test/jalview/ext/android/SparseDoubleArrayTest.java b/test/jalview/ext/android/SparseDoubleArrayTest.java
new file mode 100644
index 0000000..7d64a28
--- /dev/null
+++ b/test/jalview/ext/android/SparseDoubleArrayTest.java
@@ -0,0 +1,53 @@
+package jalview.ext.android;
+
+import static org.testng.Assert.assertEquals;
+
+import org.testng.annotations.Test;
+
+public class SparseDoubleArrayTest
+{
+
+  @Test
+  public void testConstructor()
+  {
+    double[] d = new double[] { 0d, 0d, 1.2d, 0d, 0d, 3.4d };
+    SparseDoubleArray s = new SparseDoubleArray(d);
+    for (int i = 0; i < d.length; i++)
+    {
+      assertEquals(s.get(i), d[i], "At [" + i + "]");
+    }
+  }
+
+  @Test
+  public void testAdd()
+  {
+    double[] d = new double[] { 0d, 0d, 1.2d, 0d, 0d, 3.4d };
+    SparseDoubleArray s = new SparseDoubleArray(d);
+    // add to zero (absent)
+    s.add(0, 3.2d);
+    assertEquals(s.get(0), 3.2d);
+    // add to non-zero
+    s.add(0, 2.5d);
+    assertEquals(s.get(0), 5.7d);
+    // add negative value
+    s.add(2, -5.3d);
+    assertEquals(s.get(2), -4.1d);
+    // add to unset value
+    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); // - / -
+  }
+}