add test for time variable values

Author: martin-boettcher

calvalus-processing/src/main/java/com/bc/calvalus/processing/fire/format/grid/AbstractGridReducer.java

@@ -242,7 +242,7 @@ private static void writeTime(NetcdfFileWriter ncFile, String year, String month
         ncFile.write(time, values);
     }
 
-    private static double getFirstDayAsJD(String year, String month) {
+    static double getFirstDayAsJD(String year, String month) {
         LocalDate current = Year.of(Integer.parseInt(year)).atMonth(Integer.parseInt(month)).atDay(1);
         LocalDate epoch = Year.of(1970).atMonth(1).atDay(1);
         return ChronoUnit.DAYS.between(epoch, current);

calvalus-processing/src/test/java/com/bc/calvalus/processing/fire/format/grid/AbstractGridReducerTest.java

@@ -0,0 +1,38 @@
+package com.bc.calvalus.processing.fire.format.grid;
+
+import junit.framework.TestCase;
+
+/**
+ * TODO add API doc
+ *
+ * @author Martin Boettcher
+ */
+public class AbstractGridReducerTest extends TestCase {
+
+    public void testGetFirstDayAsJD() {
+        double jan = AbstractGridReducer.getFirstDayAsJD("2019", "01");
+        double feb = AbstractGridReducer.getFirstDayAsJD("2019", "02");
+        double mar = AbstractGridReducer.getFirstDayAsJD("2019", "03");
+        double apr = AbstractGridReducer.getFirstDayAsJD("2019", "04");
+        double may = AbstractGridReducer.getFirstDayAsJD("2019", "05");
+        double jun = AbstractGridReducer.getFirstDayAsJD("2019", "06");
+        double jul = AbstractGridReducer.getFirstDayAsJD("2019", "07");
+        double aug = AbstractGridReducer.getFirstDayAsJD("2019", "08");
+        double sep = AbstractGridReducer.getFirstDayAsJD("2019", "09");
+        double oct = AbstractGridReducer.getFirstDayAsJD("2019", "10");
+        double nov = AbstractGridReducer.getFirstDayAsJD("2019", "11");
+        double dec = AbstractGridReducer.getFirstDayAsJD("2019", "12");
+        assertEquals(31.0, feb-jan, 0.0001);
+        assertEquals(28.0, mar-feb, 0.0001);
+        assertEquals(31.0, apr-mar, 0.0001);
+        assertEquals(30.0, may-apr, 0.0001);
+        assertEquals(31.0, jun-may, 0.0001);
+        assertEquals(30.0, jul-jun, 0.0001);
+        assertEquals(31.0, aug-jul, 0.0001);
+        assertEquals(31.0, sep-aug, 0.0001);
+        assertEquals(30.0, oct-sep, 0.0001);
+        assertEquals(31.0, nov-oct, 0.0001);
+        assertEquals(30.0, dec-nov, 0.0001);
+        assertEquals(17987.0, apr, 0.0001);
+    }
+}