Added a new Test class and test to test the FieldMetaType decoding

Author: cogmission

Diff for: src/test/java/org/numenta/nupic/FieldMetaTypeTest.java

@@ -0,0 +1,73 @@
+package org.numenta.nupic;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.joda.time.DateTime;
+import org.junit.Test;
+import org.numenta.nupic.encoders.DateEncoder;
+import org.numenta.nupic.util.Tuple;
+
+
+public class FieldMetaTypeTest {
+
+    /**
+     * Test decoding of 9 out of 10 types of {@link FieldMetaType}s.
+     */
+    @Test
+    public void testDecodeType() {
+        List<String> linput = new ArrayList<>();
+        linput.add("test");
+        String loutput = FieldMetaType.LIST.decodeType(linput.toString(), null);
+        assertEquals(linput.toString(), loutput);
+        
+        String catinput = "TestString";
+        String output = FieldMetaType.STRING.decodeType(catinput, null);
+        assertEquals(catinput, output);
+        
+        String binput = "true";
+        Double boutput = FieldMetaType.BOOLEAN.decodeType(binput, null);
+        assertEquals(new Double(1), boutput);
+        
+        String ginput = "100;200;5";
+        Tuple texpected = new Tuple(100.0, 200.0, 5.0);
+        Tuple tupleOut = FieldMetaType.GEO.decodeType(ginput, null);
+        assertEquals(texpected, tupleOut);
+        
+        String intinput = "1337";
+        double intoutput = FieldMetaType.INTEGER.decodeType(intinput, null);
+        assertEquals(1337.0d, intoutput, 0);
+        
+        intoutput = FieldMetaType.FLOAT.decodeType(intinput, null);
+        assertEquals(1337.0d, intoutput, 0);
+        
+        // DARR = Dense Array
+        int[] dainput = { 1, 0, 1, 0 };
+        int[] daoutput = FieldMetaType.DARR.decodeType(Arrays.toString(dainput), null);
+        assertTrue(Arrays.equals(dainput, daoutput));
+        
+        // SARR = Sparse Array
+        int[] sainput = { 0, 2 };
+        int[] saoutput = FieldMetaType.SARR.decodeType(Arrays.toString(sainput), null);
+        assertTrue(Arrays.equals(sainput, saoutput));
+        
+        DateTime comparison = new DateTime(2010, 11, 4, 13, 55, 01);
+        String compareString = "2010-11-04 13:55:01";
+        // 3 bits for season, 1 bit for day of week, 3 for weekend, 5 for time of day
+        // use of forced is not recommended, used here for readability.
+        DateEncoder.Builder builder = DateEncoder.builder();
+        builder.formatPattern("yyyy-MM-dd HH:mm:ss");
+
+        DateEncoder de = builder.season(3)
+            .dayOfWeek(1)
+            .weekend(3)
+            .timeOfDay(5).build();
+        
+        DateTime dateOutput = FieldMetaType.DATETIME.decodeType(compareString, de);
+        assertEquals(comparison, dateOutput);
+    }
+}