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diff --git a/Example/Auth/Tests/FIRTwitterAuthProviderTests.m b/Example/Auth/Tests/FIRTwitterAuthProviderTests.m
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+++ b/Example/Auth/Tests/FIRTwitterAuthProviderTests.m
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed 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.
+ */
+
+#import <XCTest/XCTest.h>
+
+#import "Twitter/FIRTwitterAuthProvider.h"
+#import "FIRAuthCredential_Internal.h"
+#import "FIRVerifyAssertionRequest.h"
+
+/** @var kTwitterToken
+    @brief A testing Twitter token.
+ */
+static NSString *const kTwitterToken = @"Token";
+
+/** @var kTwitterSecret
+    @brief A testing Twitter secret.
+ */
+static NSString *const kTwitterSecret = @"Secret";
+
+/** @var kAPIKey
+    @brief A testing API Key.
+ */
+static NSString *const kAPIKey = @"APIKey";
+
+/** @class FIRTwitterAuthProviderTests
+    @brief Tests for @c FIRTwitterAuthProvider
+ */
+@interface FIRTwitterAuthProviderTests : XCTestCase
+@end
+@implementation FIRTwitterAuthProviderTests
+
+/** @fn testCredentialWithToken
+    @brief Tests the @c credentialWithToken method to make sure the credential it produces populates
+        the appropriate fields in a verify assertion request.
+ */
+- (void)testCredentialWithToken {
+  FIRAuthCredential *credential =
+      [FIRTwitterAuthProvider credentialWithToken:kTwitterToken secret:kTwitterSecret];
+  FIRVerifyAssertionRequest *request =
+      [[FIRVerifyAssertionRequest alloc] initWithAPIKey:kAPIKey
+                                             providerID:FIRTwitterAuthProviderID];
+  [credential prepareVerifyAssertionRequest:request];
+  XCTAssertEqualObjects(request.providerAccessToken, kTwitterToken);
+  XCTAssertEqualObjects(request.providerOAuthTokenSecret, kTwitterSecret);
+}
+
+@end