chore: try to fix flipt provider tests

Signed-off-by: Mark Phelps <[email protected]>

Author: markphelps

Diff for: providers/flipt/pom.xml

@@ -36,12 +36,32 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-core</artifactId>
+            <version>2.16.1</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.16.1</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+            <version>2.16.1</version>
+            <scope>test</scope>
+        </dependency>
+
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-slf4j2-impl</artifactId>
             <version>2.22.1</version>
             <scope>test</scope>
         </dependency>
-
     </dependencies>
 </project>

Diff for: providers/flipt/src/test/java/dev/openfeature/contrib/providers/flipt/FliptProviderTest.java

@@ -71,12 +71,12 @@ public void shutdown() {
     private void mockFliptAPI(String url, String resourceName, String flagKey) {
         stubFor(
                 post(urlEqualTo(url))
-                        .withHeader("Content-Type", equalTo("application/json"))
+                        .withHeader("Content-Type", equalTo("application/json; charset=UTF-8"))
                         .withRequestBody(WireMock.containing(flagKey))
                         .willReturn(
                                 aResponse()
                                         .withStatus(200)
-                                        .withHeader("Content-Type", "application/json")
+                                        .withHeader("Content-Type", "application/json; charset=UTF-8")
                                         .withBody(readResourceFileContent(resourceName))));
     }