adding test case for sanitization

Author: dhaval24

core/src/test/java/com/microsoft/applicationinsights/common/SanitizationUtilsTests.java

@@ -0,0 +1,13 @@
+package com.microsoft.applicationinsights.common;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SanitizationUtilsTests {
+
+    @Test
+    public void testSanitizeStringForJSON() {
+        String result = SanitizationUtils.sanitizeStringForJSON("{\"entityType\":\"CONTACTNAME\",\"contactField\":\"\",\"query\":\"zuck\",\"candidates\":[{\"id\":\"2\",\"name\":\"Andrew Zuck\",\"aliases\":[],\"phoneNumbers\":[{\"type\":\"MOBILENUMBER\",\"number\":\"+1 (555) 222-2222\"}],\"emailAddresses\":[],\"streetAddresses\":[]}],\"scores\":{\"2\":2.327993297520463}}");
+        Assert.assertEquals(result, "{\\\"entityType\\\":\\\"CONTACTNAME\\\",\\\"contactField\\\":\\\"\\\",\\\"query\\\":\\\"zuck\\\",\\\"candidates\\\":[{\\\"id\\\":\\\"2\\\",\\\"name\\\":\\\"Andrew Zuck\\\",\\\"aliases\\\":[],\\\"phoneNumbers\\\":[{\\\"type\\\":\\\"MOBILENUMBER\\\",\\\"number\\\":\\\"+1 (555) 222-2222\\\"}],\\\"emailAddresses\\\":[],\\\"streetAddresses\\\":[]}],\\\"scores\\\":{\\\"2\\\":2.327993297520463}}");
+    }
+}