Feature/1019 tests

[Tguntenaar]

Resolves #1019

• test_if_the_last_ten_will_get_indexed
• test_cors_configuration
• test_separate_number_and_text
• test_custom_error_handler
• test_route_test

[Tguntenaar]

@petersalomonsen could you review this?

[Tguntenaar]

@race-of-sloths include

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