add oauth token endpoint test

Author: lbalmaceda

auth0/src/test/java/com/auth0/authentication/AuthenticationAPIClientTest.java

@@ -26,13 +26,11 @@
 
 
 import com.auth0.Auth0;
-import com.auth0.Auth0Exception;
 import com.auth0.authentication.result.Authentication;
 import com.auth0.authentication.result.Credentials;
 import com.auth0.authentication.result.DatabaseUser;
 import com.auth0.authentication.result.Delegation;
 import com.auth0.authentication.result.UserProfile;
-import com.auth0.request.ParameterizableRequest;
 import com.auth0.util.AuthenticationAPI;
 import com.auth0.util.MockBaseCallback;
 import com.fasterxml.jackson.core.type.TypeReference;
@@ -50,7 +48,6 @@
 import static com.auth0.util.AuthenticationAPI.ID_TOKEN;
 import static com.auth0.util.AuthenticationAPI.REFRESH_TOKEN;
 import static com.auth0.util.CallbackMatcher.hasNoError;
-import static com.auth0.util.CallbackMatcher.hasNoPayloadOfType;
 import static com.auth0.util.CallbackMatcher.hasPayload;
 import static com.auth0.util.CallbackMatcher.hasPayloadOfType;
 import static org.hamcrest.Matchers.equalTo;
@@ -769,7 +766,7 @@ public void shouldGetNewIdTokenWithRefreshTokenSync() throws Exception {
 
         assertThat(delegation, is(notNullValue()));
     }
-    
+
     @Test
     public void shouldUnlinkAccount() throws Exception {
         mockAPI.willReturnSuccessfulUnlinkAccount();
@@ -1173,7 +1170,29 @@ public void shouldFetchProfileAfterLoginRequest() throws Exception {
         assertThat(secondRequest.getPath(), equalTo("/tokeninfo"));
 
         assertThat(callback, hasPayloadOfType(Authentication.class));
+    }
+
+    @Test
+    public void shouldGetOAuthToken() throws Exception {
+        mockAPI
+                .willReturnAuthorizationCodeInfo()
+                .willReturnTokenInfo();
 
+        final MockBaseCallback<Credentials> callback = new MockBaseCallback<>();
+        client.token("code", AuthenticationAPI.CODE_VERIFIER, AuthenticationAPI.REDIRECT_URI)
+                .start(callback);
+
+        final RecordedRequest request = mockAPI.takeRequest();
+        assertThat(request.getPath(), equalTo("/oauth/token"));
+
+        Map<String, String> body = bodyFromRequest(request);
+        assertThat(body, hasEntry("redirect_uri", AuthenticationAPI.REDIRECT_URI));
+        assertThat(body, hasEntry("grant_type", ParameterBuilder.GRANT_TYPE_AUTHORIZATION_CODE));
+        assertThat(body, hasEntry("client_id", CLIENT_ID));
+        assertThat(body, hasEntry("code_verifier", AuthenticationAPI.CODE_VERIFIER));
+        assertThat(body, hasEntry("code", "code"));
+
+        assertThat(callback, hasPayloadOfType(Credentials.class));
     }
 
     private Map<String, String> bodyFromRequest(RecordedRequest request) throws java.io.IOException {

auth0/src/test/java/com/auth0/util/AuthenticationAPI.java

@@ -40,6 +40,8 @@ public class AuthenticationAPI  {
     public static final String NEW_ID_TOKEN = "NEW_ID_TOKEN";
     public static final int EXPIRES_IN = 1234567890;
     public static final String TOKEN_TYPE = "TOKEN_TYPE";
+    public static final String CODE_VERIFIER = "CODE_VERIFIER";
+    public static final String REDIRECT_URI = "REDIRECT_URI";
 
     private MockWebServer server;
 
@@ -155,6 +157,18 @@ public AuthenticationAPI willReturnTokenInfo() {
         return this;
     }
 
+    public AuthenticationAPI willReturnAuthorizationCodeInfo() {
+        String json = "{\"" +
+                "redirect_uri\": \"" + REDIRECT_URI + "\"," +
+                "\"code_verifier\": \"" + CODE_VERIFIER + "\"," +
+                "\"client_id\":\"U5MhUrbyQHSVWjlEqZSTCBUFABLbJAS3\"," +
+                "\"code\": \"" + CODE_VERIFIER + "\",\n" +
+                "\"grant_type\":\"authorization_code\"" +
+                "}";
+        server.enqueue(responseWithJSON(json, 200));
+        return this;
+    }
+
     public AuthenticationAPI willReturnApplicationResponseWithBody(String body, int statusCode) {
         MockResponse response =  new MockResponse()
                 .setResponseCode(statusCode)