Describe the bug
load function not available in setup_suite

% ./tests/bats/core/bin/bats -r ./tests/unit/template.bats
/Users/jkr/IdeaProjects/private/helm-secrets/tests/unit/setup_suite.bash: line 3: load: command not found
 ✗ setup_suite
   bats warning: Executed 1 instead of expected 59 tests

59 tests, 1 failure, 58 not run

To Reproduce
Steps to reproduce the behavior:

1. Create a load.bash file inside test directory
2. Create a setup_suite.bash inside the test directory:

   load './load'
   
   setup_suite() {
     true
   }

3. Run test suite
4. See error

Expected behavior
No error

Environment (please complete the following information):

• Bats Version [e.g. 1.4.0 or commit hash] c97b3a1
• OS: [e.g. Linux, FreeBSD, MacOS] MacOS
• Bash version: [e.g. 5.1] 3.2.57(1)-release

Additional context

Originally posted by @martin-schulze-vireso in #636 (comment)