Add unit test for HttpUtils

Author: sgonzalezMSFT

src/test/java/com/microsoft/aad/msal4j/HttpUtilsTest.java

@@ -0,0 +1,55 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package com.microsoft.aad.msal4j;
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Test(groups = { "checkin" })
+public class HttpUtilsTest {
+
+    private final String COOKIE_HEADER_NAME = "Set-Cookie";
+    private final String COOKIE_HEADER_VALUE_1 = "298zf09hf012fh2";
+    private final String COOKIE_HEADER_VALUE_2 = "u32t4o3tb3gg43";
+
+    @Test
+    public void testHttpUtils_singleValueHeader(){
+
+        Map<String, List<String>> singleValuedHeader = new HashMap<String, List<String>>(){{
+            put(COOKIE_HEADER_NAME, Collections.singletonList(COOKIE_HEADER_VALUE_1));
+        }};
+
+        String headerValue = HttpUtils.headerValue(singleValuedHeader, COOKIE_HEADER_NAME);
+        Assert.assertEquals(headerValue, COOKIE_HEADER_VALUE_1);
+    }
+
+    @Test
+    public void testHttpUtils_multiValueHeader(){
+
+        Map<String, List<String>> multiValuedHeader = new HashMap<String, List<String>>(){{
+            put(COOKIE_HEADER_NAME, Arrays.asList(COOKIE_HEADER_VALUE_1, COOKIE_HEADER_VALUE_2));
+        }};
+
+        String headerValue = HttpUtils.headerValue(multiValuedHeader, COOKIE_HEADER_NAME);
+        String expectedValue = COOKIE_HEADER_VALUE_1 + "," + COOKIE_HEADER_VALUE_2;
+        Assert.assertEquals(headerValue, expectedValue);
+    }
+
+    @Test
+    public void testHttpUtils_HeaderValueNull(){
+
+        Map<String, List<String>> nullValuedHeader = new HashMap<String, List<String>>(){{
+            put(COOKIE_HEADER_NAME, null);
+        }};
+
+        String headerValue = HttpUtils.headerValue(nullValuedHeader, COOKIE_HEADER_NAME);
+        Assert.assertNull(headerValue);
+    }
+}