Add JUnit test case for Histogram.java

src/test/TestHistogram.java

+package test;
+
+import search.trawl.*;
+import static org.junit.Assert.*;
+
+import org.json.simple.parser.ParseException;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import data.FileProcessor;
+import data.Record;
+import data.biotree.BioTree;
+import data.biotree.TaxonNode;
+import model.TrawlExpert;
+import search.RedBlackTree;
+import search.trawl.BasicSearch;
+import search.trawl.BasicSearchResult;
+
+/**
+ * Testing was performed on a small dataset for which we know the correct numbers of data for each
+ * taxon. Takes a while to process the dataset since most of the species in the set are unique and
+ * thus require API calls.
+ * @author TrawlStars, Inc.
+ *
+ */
+public class TestHistogram {
+	public static TrawlExpert te;
+	public static RedBlackTree<Integer, Integer> histo;
+	/**
+	 * Loads the small dataset into memory using the FileProcessor.
+	 * @throws Exception Cannot find dataset given.
+	 */
+	@BeforeClass
+	public static void setUp() throws Exception {
+		// Assumes serialized data is present
+		te = new TrawlExpert();
+	}
+
+
+	@Test
+	public void testSum1() {
+		BasicSearchResult result = te.rangeSearch(154210, 1990, 2000);	// Esox lucius
+		assert(Histogram.sum(result.results()) == 4);
+	}
+	
+	@Test
+	public void testSum2() {
+		BasicSearchResult result = te.rangeSearch(154210, 2000, 2005);	// Esox lucius
+		assert(Histogram.sum(result.results()) == 0);
+	}
+	
+	@Test
+	public void testSum3() {
+		BasicSearchResult result = te.rangeSearch(448306, 2000, 2008);	// Anura
+		assert(Histogram.sum(result.results()) == 9);
+	}
+}