Add unit tests for HTTP and SPDY headers

Motivation:

When attempting to retrieve a SPDY header using an AsciiString key, if the header was inserted using a String based key, the lookup would fail. Similarly, the lookup would fail if the header was inserted with an AsciiString key, and retrieved using a String key. This has been fixed with the header simplification commit (1a43923aa8).

Extra unit tests have been added to protect against this issue occurring in the future.  The tests check that a header added using String or AsciiString can be retrieved using AsciiString or String respectively.

Modifications:

Added more unit tests

Result:

Protect against issue #4053 happening again.

codec-http/src/test/java/io/netty/handler/codec/http/DefaultHttpHeadersTest.java

@@ -26,10 +26,7 @@ import java.util.List;
 import static io.netty.util.AsciiString.contentEquals;
 import static java.util.Arrays.asList;
 import static org.hamcrest.CoreMatchers.is;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.*;
 
 public class DefaultHttpHeadersTest {
     private static final String HEADER_NAME = "testHeader";
@@ -67,6 +64,42 @@ public class DefaultHttpHeadersTest {
         assertEquals(headers1.hashCode(), headers2.hashCode());
     }
 
+    @Test
+    public void testStringKeyRetrievedAsAsciiString() {
+        final HttpHeaders headers = new DefaultHttpHeaders(false);
+
+        // Test adding String key and retrieving it using a AsciiString key
+        final String connection = "keep-alive";
+        headers.add("Connection", connection);
+
+        // Passes
+        final String value = headers.getAsString(HttpHeaderNames.CONNECTION.toString());
+        assertNotNull(value);
+        assertEquals(connection, value);
+
+        // Passes
+        final String value2 = headers.getAsString(HttpHeaderNames.CONNECTION);
+        assertNotNull(value2);
+        assertEquals(connection, value2);
+    }
+
+    @Test
+    public void testAsciiStringKeyRetrievedAsString() {
+        final HttpHeaders headers = new DefaultHttpHeaders(false);
+
+        // Test adding AsciiString key and retrieving it using a String key
+        final String cacheControl = "no-cache";
+        headers.add(HttpHeaderNames.CACHE_CONTROL, cacheControl);
+
+        final String value = headers.getAsString(HttpHeaderNames.CACHE_CONTROL);
+        assertNotNull(value);
+        assertEquals(cacheControl, value);
+
+        final String value2 = headers.getAsString(HttpHeaderNames.CACHE_CONTROL.toString());
+        assertNotNull(value2);
+        assertEquals(cacheControl, value2);
+    }
+
     @Test
     public void testRemoveTransferEncodingIgnoreCase() {
         HttpMessage message = new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK);
@@ -92,7 +125,7 @@ public class DefaultHttpHeadersTest {
     }
 
     @Test
-    public void testEquansIgnoreCase() {
+    public void testEqualsIgnoreCase() {
         assertThat(AsciiString.contentEqualsIgnoreCase(null, null), is(true));
         assertThat(AsciiString.contentEqualsIgnoreCase(null, "foo"), is(false));
         assertThat(AsciiString.contentEqualsIgnoreCase("bar", null), is(false));

codec-http/src/test/java/io/netty/handler/codec/spdy/DefaultSpdyHeadersTest.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.handler.codec.spdy;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+public class DefaultSpdyHeadersTest {
+
+    @Test
+    public void testStringKeyRetrievedAsAsciiString() {
+        final SpdyHeaders headers = new DefaultSpdyHeaders();
+
+        // Test adding String key and retrieving it using a AsciiString key
+        final String method = "GET";
+        headers.add(":method", method);
+
+        final String value = headers.getAsString(SpdyHeaders.HttpNames.METHOD.toString());
+        assertNotNull(value);
+        assertEquals(method, value);
+
+        final String value2 = headers.getAsString(SpdyHeaders.HttpNames.METHOD);
+        assertNotNull(value2);
+        assertEquals(method, value2);
+    }
+
+    @Test
+    public void testAsciiStringKeyRetrievedAsString() {
+        final SpdyHeaders headers = new DefaultSpdyHeaders();
+
+        // Test adding AsciiString key and retrieving it using a String key
+        final String path = "/";
+        headers.add(SpdyHeaders.HttpNames.PATH, path);
+
+        final String value = headers.getAsString(SpdyHeaders.HttpNames.PATH);
+        assertNotNull(value);
+        assertEquals(path, value);
+
+        final String value2 = headers.getAsString(SpdyHeaders.HttpNames.PATH.toString());
+        assertNotNull(value2);
+        assertEquals(path, value2);
+    }
+}