Tests failing on bash 4.4

I just downloaded git-secrets via git (commit b29698881), ran `make test` and 3 tests fail:
- Rejects commits with prohibited patterns in changeset
- Scans staged files
- Rejects commits with prohibited patterns in changeset when AWS provider is enabled

Details:

$ bash --version | head -1
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)

$ grep --version | head -1
grep (GNU grep) 3.1

$ make test
test/bats/bin/bats test/
✓ Rejects commit messages with prohibited patterns
✓ Allows commit messages that do not match a prohibited pattern
✓ no arguments prints usage instructions
✓ -h prints help
✓ Invalid scan filename fails
✓ Does not require secrets
✓ No prohibited matches exits 0
✓ Scans all files when no file provided
✓ Scans all files including history
✓ Scans all files when no file provided with secret in history
✓ Scans all files including history with secret in history
✓ Scans history with secrets distributed among branches in history
✓ Scans recursively
✓ Scans recursively only if -r is given
✓ Excludes allowed patterns from failures
✓ Prohibited matches exits 1
✓ Only matches on word boundaries
✓ Can scan from stdin using -
✓ installs hooks for repo
✓ fails if hook exists and no -f
✓ Overwrites hooks if -f is given
✓ installs hooks for repo with Debian style directories
✓ installs hooks to template directory
✓ Scans using keys from credentials file
✓ Lists secrets for a repo
✓ Adds secrets to a repo and de-dedupes
✓ Adds allowed patterns to a repo and de-dedupes
✓ Empty lines must be ignored in .gitallowed files
✓ Comment lines must be ignored in .gitallowed files
✓ Scans all files and allowing none of the bad patterns in .gitallowed
✓ Scans all files and allowing all bad patterns in .gitallowed
✓ Adds common AWS patterns
✓ Adds providers
✓ Strips providers that return nothing
✓ --recursive cannot be used with SCAN_*
✓ --recursive can be used with --scan
✓ --recursive can't be used with --list
✓ -f can only be used with --install
✓ -a can only be used with --add
✓ -l can only be used with --add
✓ --cached can only be used with --scan
✓ --no-index can only be used with --scan
✓ --untracked can only be used with --scan
✗ Rejects commits with prohibited patterns in changeset
(in test file test/pre-commit.bats, line 9)
`[ $status -eq 1 ]' failed
Initialized empty Git repository in /tmp/test-repo/.git/
/home/dserodio/code/git-secrets
/tmp/test-repo
/tmp/test-repo
✓ Rejects commits with prohibited patterns in changeset with filename that contain spaces
✗ Scans staged files
(in test file test/pre-commit.bats, line 32)
`[ $status -eq 1 ]' failed
Initialized empty Git repository in /tmp/test-repo/.git/
/home/dserodio/code/git-secrets
/tmp/test-repo
✓ Allows commits that do not match prohibited patterns
✗ Rejects commits with prohibited patterns in changeset when AWS provider is enabled
(in test file test/pre-commit.bats, line 56)
`[ $status -eq 1 ]' failed
Initialized empty Git repository in /tmp/test-repo/.git/
/home/dserodio/code/git-secrets
/tmp/test-repo
/tmp/test-repo
/tmp/test-repo
✓ Rejects merges with prohibited patterns in history
✓ Allows merges that do not match prohibited patterns

50 tests, 3 failures
Makefile:12: recipe for target 'test' failed
make: *** [test] Error 1