Added unit test for Synapse object equals() method

Author: Hopding

src/test/java/org/numenta/nupic/model/SynapseTest.java

@@ -0,0 +1,67 @@
+package org.numenta.nupic.model;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class SynapseTest {
+    @Test
+    public void testSynapseEquality() {
+        // Make stuff we need to perform the tests
+        Column column = new Column(1, 0);
+        Cell cell1 = new Cell(column, 0);
+        Cell cell2 = new Cell(column, 1);
+        DistalDendrite segment1 = new DistalDendrite(cell1, 0, 0, 0);
+        DistalDendrite segment2 = new DistalDendrite(cell1, 1, 1, 1);
+
+        // These are the Synapse objects we will use for the tests
+        Synapse synapse1 = new Synapse();
+        Synapse synapse2 = new Synapse();
+
+        /* ----- These are the equality tests: ----- */
+        // synapse1 should equal itself
+        assertTrue(synapse1.equals(synapse1));
+
+        // synapse1 should not equal null
+        assertFalse(synapse1.equals(null));
+
+        // synapse1 should not equal a non-Synapse object
+        assertFalse(synapse1.equals("This is not a Synapse object"));
+
+        // synapse1 should not equal synapse2 because synapse2's
+        // inputIndex != synapse1's inputIndex
+        synapse1.setPresynapticCell(cell1);
+        assertFalse(synapse1.equals(synapse2));
+
+        // synapse1 should not equal synapse2 because synapse1's
+        // segment is null, but synapse2's segment is not null
+        synapse2 = new Synapse(cell1, segment1, 0, 0);
+        assertFalse(synapse1.equals(synapse2));
+
+        // synapse1 should not equal synapse2 because synapse1's
+        // segment != synapse2's segment
+        synapse1 = new Synapse(cell1, segment2, 0, 0);
+        assertFalse(synapse1.equals(synapse2));
+
+        // synapse1 should not equal synapse2 because synapse1's
+        // sourceCell is null, but synapse2's sourceCell is not null
+        synapse1.setPresynapticCell(null);
+        assertFalse(synapse1.equals(synapse2));
+
+        // synapse1 should not equal synapse2 because synapse1's
+        // sourceCell != synapse2's sourceCell
+        synapse1.setPresynapticCell(cell2);
+        assertFalse(synapse1.equals(synapse2));
+
+        // synapse1 should not equal synapse 2 because synapse1's
+        // synapseIndex != synapse2's synapseIndex
+        synapse1 = new Synapse(cell1, segment1, 0, 0);
+        synapse2 = new Synapse(cell1, segment1, 1, 0);
+        assertFalse(synapse1.equals(synapse2));
+
+        // synapse1 should equal synapse2 because all of their
+        // relevant properties are equal
+        synapse1 = new Synapse(cell1, segment1, 0, 0);
+        synapse2 = new Synapse(cell1, segment1, 0, 0);
+        assertTrue(synapse1.equals(synapse2));
+    }
+}