There were 3 errors:

1) core_gradelib_testcase::test_grade_get_date_for_user_grade with data set "If the user is not the last person to have modified the grade_item, and there is no submission date, then show the date that it was submitted" (stdClass Object (...), stdClass Object (...), 9876543210.0)
TypeError: Argument 3 passed to core_gradelib_testcase::test_grade_get_date_for_user_grade() must be of the type integer or null, float given, called in C:\inetpub\wwwroot\imaster\vendor\phpunit\phpunit\src\Framework\TestCase.php on line 1153

C:\inetpub\wwwroot\imaster\lib\tests\gradelib_test.php:163
C:\inetpub\wwwroot\imaster\lib\phpunit\classes\advanced_testcase.php:80

To re-run:
 vendor\bin\phpunit "core_gradelib_testcase" lib\tests\gradelib_test.php

2) core_upgradelib_testcase::test_upgrade_rename_prediction_actions_useful_incorrectly_flagged DateTimeImmutable::setTimestamp() expects parameter 1 to be integer, float given


C:\inetpub\wwwroot\imaster\analytics\classes\local\time_splitting\periodic.php:83
C:\inetpub\wwwroot\imaster\analytics\classes\local\time_splitting\base.php:99
C:\inetpub\wwwroot\imaster\analytics\classes\analysis.php:230
C:\inetpub\wwwroot\imaster\analytics\classes\analysis.php:202
C:\inetpub\wwwroot\imaster\analytics\classes\analysis.php:105
C:\inetpub\wwwroot\imaster\analytics\classes\local\analyser\base.php:305
C:\inetpub\wwwroot\imaster\analytics\classes\model.php:824
C:\inetpub\wwwroot\imaster\lib\tests\upgradelib_test.php:876
C:\inetpub\wwwroot\imaster\lib\phpunit\classes\advanced_testcase.php:80

To re-run:
 vendor\bin\phpunit "core_upgradelib_testcase" lib\tests\upgradelib_test.php

3) mod_lti_locallib_testcase::test_lti_sign_jwt openssl_sign(): supplied key param cannot be coerced into a private key

C:\inetpub\wwwroot\imaster\lib\php-jwt\src\JWT.php:209
C:\inetpub\wwwroot\imaster\lib\php-jwt\src\JWT.php:180
C:\inetpub\wwwroot\imaster\mod\lti\locallib.php:3187
C:\inetpub\wwwroot\imaster\mod\lti\tests\locallib_test.php:1286
C:\inetpub\wwwroot\imaster\lib\phpunit\classes\advanced_testcase.php:80

To re-run:
 vendor\bin\phpunit "mod_lti_locallib_testcase" mod\lti\tests\locallib_test.php

ERRORS!
Tests: 15442, Assertions: 131511, Errors: 3, Skipped: 148.