diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 3a07c7c..6d0198c 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -1,11 +1,11 @@
-name: Run basic tests
+name: Tests
 
 on: [push]
 
 jobs:
   test:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
diff --git a/Readme.md b/Readme.md
index 7264e26..63366ae 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,6 +1,8 @@
 Distributed processing of a batch of tasks.
 ===========================================
 
+[![Tests](https://github.com/flatironinstitute/disBatch/actions/workflows/tests.yaml/badge.svg)](https://github.com/flatironinstitute/disBatch/actions/workflows/tests.yaml)
+
 ## TL;DR
 
 Create a file `Tasks`:
diff --git a/tests/test_slurm/run.sh b/tests/test_slurm/run.sh
index 2204e01..2e2784a 100755
--- a/tests/test_slurm/run.sh
+++ b/tests/test_slurm/run.sh
@@ -12,7 +12,7 @@ salloc -n 2 disBatch Tasks
 [[ -f A.txt && -f B.txt && -f C.txt ]]
 success=$?
 
-cd -
+cd - > /dev/null
 
 if [[ $success -eq 0 ]]; then
     echo "Slurm test passed."
diff --git a/tests/test_ssh/run.sh b/tests/test_ssh/run.sh
index 0872656..ac59e73 100755
--- a/tests/test_ssh/run.sh
+++ b/tests/test_ssh/run.sh
@@ -12,7 +12,7 @@ disBatch -s localhost:2 Tasks
 [[ -f A.txt && -f B.txt && -f C.txt ]]
 success=$?
 
-cd -
+cd - > /dev/null
 
 if [[ $success -eq 0 ]]; then
     echo "SSH test passed."