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Certificate tests failing to upload singature png on Firefox 57

Description

Reference for Bok Choy upgrade process: https://openedx.atlassian.net/wiki/spaces/TE/pages/567083109/Firefox+57+upgrade+for+Bok+Choy+tests

Description: As part of the Firefox upgrade on Jenkins, the following tests are failing, and need to be fixed

Error Msg:

1 InvalidArgumentException: Message: File not found: /home/jenkins/workspace/edx-platform-test-subset/common/test/data/uploads/Signature-d2ec.png

Link to failing build: https://build.testeng.edx.org/job/edx-platform-test-subset/1100577/

Tests Impacted:

acceptance.tests.studio.test_studio_settings_certificates.CertificatesTest.test_can_create_and_edit_certficate
acceptance.tests.studio.test_studio_settings_certificates.CertificatesTest.test_can_create_and_edit_signatories_of_certficate
acceptance.tests.studio.test_studio_settings_certificates.CertificatesTest.test_can_delete_certificate
acceptance.tests.studio.test_studio_settings_certificates.CertificatesTest.test_course_number_in_certificate_details_view
acceptance.tests.studio.test_studio_settings_certificates.CertificatesTest.test_course_number_override_in_certificate_details_view
acceptance.tests.studio.test_studio_settings_certificates.CertificatesTest.test_line_breaks_in_signatory_title

Steps to Reproduce

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Current Behavior

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Expected Behavior

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Reason for Variance

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Release Notes

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User Impact Summary

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Status

Assignee

Stuart Young

Reporter

Stuart Young

Reach

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Impact

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Customer

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Partner Manager

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URL

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Contributor Name

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Groups with Read-Only Access

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Actual Points

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Category of Work

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Stakeholders

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Sprint

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Priority

CAT-3