add new tests for coverage

src/test/java/com/poiji/parser/NumberParserTest.java

@@ -0,0 +1,27 @@
+package com.poiji.parser;
+
+import org.junit.Test;
+
+import com.poiji.option.PoijiOptions;
+import com.poiji.option.PoijiOptions.PoijiOptionsBuilder;
+
+import static org.junit.Assert.assertEquals;
+
+import java.text.NumberFormat;
+
+public class NumberParserTest {
+    @Test
+    public void parseNumber() {
+        PoijiOptions options = PoijiOptionsBuilder.settings().build();
+        NumberParser numParser = new NumberParser(NumberFormat.getInstance(options.getLocale()));
+        Number expectedNumber = numParser.parse("1").doubleValue();
+        assertEquals(expectedNumber.doubleValue(), 1.0, 0);
+    }
+
+    @Test(expected = NumberFormatException.class)
+    public void parseNullNumber() {
+        PoijiOptions options = PoijiOptionsBuilder.settings().build();
+        NumberParser numParser = new NumberParser(NumberFormat.getInstance(options.getLocale()));
+        numParser.parse(null).doubleValue();
+    }
+}

src/test/java/com/poiji/util/DefaultCastingTest.java

@@ -266,6 +266,12 @@ public void castBigDecimal() {
         assertEquals(BigDecimal.valueOf(81.56891), testVal);
     }
 
+    @Test
+    public void castEmptyString() {
+        Object testVal = casting.castValue(String.class, "", options);
+        assertEquals("", testVal);
+    }
+
     static class MyConfig extends DefaultCasting {
         Object castValue(Class<?> fieldType, String value, PoijiOptions options) {
             return getValueObject(null, -1, -1, options, value, fieldType);