Behat tests failing

[ewallah]

Moodle 3.6.4+ (Build: 20190530)
Php: 7.2.17.0.0.18.04.1, pgsql: 10.8
Server OS "Linux", Browser: "firefox"

001 Scenario: View the block by a user with several enrolments # blocks/course_overview/tests/behat/block_course_overview.feature:29
    And I add the "Course overview (legacy)" block             # blocks/course_overview/tests/behat/block_course_overview.feature:23
    Link_exact matching locator "Course overview (legacy)" in the "#region-main" "css_element"" not found. (Behat\Mink\Exception\ElementNotFoundException)

002 Scenario: View the block by a user with the full categories displayed. # blocks/course_overview/tests/behat/block_course_overview.feature:53
    And I add the "Course overview (legacy)" block                         # blocks/course_overview/tests/behat/block_course_overview.feature:23
    Link_exact matching locator "Course overview (legacy)" in the "#region-main" "css_element"" not found. (Behat\Mink\Exception\ElementNotFoundException)
 
003 Scenario: Add course overview (legacy)  block to page # blocks/course_overview/tests/behat/block_course_overview_student.feature:18
    And I add the "Course overview (legacy)" block        # blocks/course_overview/tests/behat/block_course_overview_student.feature:20
    Link_exact matching locator "Course overview (legacy)" in the "#region-main" "css_element"" not found. (Behat\Mink\Exception\ElementNotFoundException)