Add PATCH constant to HttpExtension for service invocation (dapr#1644)

Signed-off-by: Javier Aliaga <javier@diagrid.io>

Author: lindner

sdk/src/main/java/io/dapr/client/domain/HttpExtension.java

@@ -47,6 +47,10 @@ public final class HttpExtension {
    * Convenience HttpExtension object for the {@link DaprHttp.HttpMethods#DELETE} Verb with empty queryString.
    */
   public static final HttpExtension DELETE = new HttpExtension(DaprHttp.HttpMethods.DELETE);
+  /**
+   * Convenience HttpExtension object for the {@link DaprHttp.HttpMethods#PATCH} Verb with empty queryString.
+   */
+  public static final HttpExtension PATCH = new HttpExtension(DaprHttp.HttpMethods.PATCH);
   /**
    * Convenience HttpExtension object for the {@link DaprHttp.HttpMethods#HEAD} Verb with empty queryString.
    */

sdk/src/test/java/io/dapr/client/domain/HttpExtensionTest.java

@@ -57,4 +57,12 @@ void shouldEncodeQueryParamWithSpacesAndSpecialCharacters() {
     Assertions.assertEquals("user+name=John+Do%C3%AB+%26+Co.", encoded);
   }
 
+  @Test
+  @DisplayName("PATCH constant should use PATCH HTTP method")
+  void patchConstantShouldUsePatchHttpMethod() {
+    Assertions.assertEquals(DaprHttp.HttpMethods.PATCH, HttpExtension.PATCH.getMethod());
+    Assertions.assertTrue(HttpExtension.PATCH.getQueryParams().isEmpty());
+    Assertions.assertTrue(HttpExtension.PATCH.getHeaders().isEmpty());
+  }
+
 }