NullParserTest added

src/test/java/com/techatpark/sjson/core/NullParserTest.java

@@ -0,0 +1,56 @@
+package com.techatpark.sjson.core;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.io.IOException;
+import java.io.StringReader;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class NullParserTest {
+
+    final ObjectMapper objectMapper = new ObjectMapper();
+
+    /**
+     * Tests Valid Null value.
+     * <p>
+     *     Steps:
+     *     1) Pass a null value.
+     *     2) Get JSON String from Jackson . (jsonString)
+     *     3) With this JSON String read java object using JSON.
+     * </p>
+     * Expected Result:
+     * This value should be null.
+     * @throws IOException
+     */
+    @Test
+    void testValid() throws IOException {
+        String jsonString = objectMapper.writeValueAsString(null);
+        Assertions.assertNull(new Json().read(new StringReader(jsonString)));
+    }
+
+    /**
+     * Tests Invalid Null value.
+     * <p>
+     *     Steps:
+     *     1) Pass a invalid null value(invalidjson).
+     *     2) Read java object using JSON.
+     * </p>
+     * Expected Result:
+     * IllegalArguementException should be thrown.
+     * @param invalidjson
+     */
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "nu"
+    })
+    void testInvalid(final String invalidjson) throws IOException {
+        assertThrows(IllegalArgumentException.class,
+                () -> new Json().read(new StringReader(invalidjson)));
+    }
+
+}

src/test/java/com/techatpark/sjson/core/StringParserTest.java

@@ -44,7 +44,7 @@ void testValid(final String originalValue) throws IOException {
      * Tests Invalid String values.
      * <p>
      *     Steps:
-     *     1) Pass valid string value(original value).
+     *     1) Pass invalid string value(invalidjson).
      *     2) Read java object using JSON.
      * </p>
      * Expected Result: