test/test_out_s3.rb in fluent-plugin-s3-0.6.3 vs test/test_out_s3.rb in fluent-plugin-s3-0.6.4

@@ -465,9 +465,33 @@
     client = d.instance.instance_variable_get(:@s3).client
     credentials = client.config.credentials
     assert_equal(expected_credentials, credentials)
   end
 
+  def test_assume_role_credentials_with_region
+    expected_credentials = Aws::Credentials.new("test_key", "test_secret")
+    sts_client = Aws::STS::Client.new(:region => 'ap-northeast-1')
+    mock(Aws::STS::Client).new(:region => 'ap-northeast-1'){ sts_client }
+    mock(Aws::AssumeRoleCredentials).new(:role_arn => "test_arn",
+                                         :role_session_name => "test_session",
+                                         :client => sts_client){
+      expected_credentials
+    }
+    config = CONFIG_TIME_SLICE.split("\n").reject{|x| x =~ /.+aws_.+/}.join("\n")
+    config += %[
+      s3_region ap-northeast-1
+      <assume_role_credentials>
+        role_arn test_arn
+        role_session_name test_session
+      </assume_role_credentials>
+    ]
+    d = create_time_sliced_driver(config)
+    assert_nothing_raised{ d.run }
+    client = d.instance.instance_variable_get(:@s3).client
+    credentials = client.config.credentials
+    assert_equal(expected_credentials, credentials)
+  end
+
   def test_instance_profile_credentials
     expected_credentials = Aws::Credentials.new("test_key", "test_secret")
     mock(Aws::InstanceProfileCredentials).new({}).returns(expected_credentials)
     config = CONFIG_TIME_SLICE.split("\n").reject{|x| x =~ /.+aws_.+/}.join("\n")
     config += %[