diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index fd60955..1844d57 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -31,6 +31,9 @@ RUN mkdir -p ${WORKSPACE} \
 USER ${USERNAME}
 WORKDIR ${WORKSPACE}
 
+# RUN export PATH=/home/vscode/.local/bin:$$PATH
+# RUN pip install black flake8 pytest
+
 # [Optional] If your pip requirements rarely change, uncomment this section to add them to the image.
 # COPY requirements.txt /tmp/pip-tmp/
 # RUN pip3 --disable-pip-version-check --no-cache-dir install -r /tmp/pip-tmp/requirements.txt \
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 479a215..089d1ca 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -31,4 +31,7 @@ jobs:
           flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
       - name: Test with pytest
         run: |
+          # install local module
+          pip install .
+          # test with Pytest
           pytest
\ No newline at end of file
diff --git a/scripts/install-deps.sh b/scripts/install-deps.sh
old mode 100644
new mode 100755
index b6c579f..7a5743f
--- a/scripts/install-deps.sh
+++ b/scripts/install-deps.sh
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-python -m pip install --upgrade pip
-pip install black build flake8 pytest
+set -eux
+
+pip install black flake8 pytest
+
 if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
 if [ -f requirements-dev.txt ]; then pip install -r requirements-dev.txt; fi
diff --git a/scripts/lint.sh b/scripts/lint.sh
old mode 100644
new mode 100755
index e559d2f..db835ed
--- a/scripts/lint.sh
+++ b/scripts/lint.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -eux
+
 # stop the build if there are Python syntax errors or undefined names
 flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
 
diff --git a/scripts/test.sh b/scripts/test.sh
old mode 100644
new mode 100755
index 1735967..17a4493
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -1,3 +1,7 @@
 #!/bin/bash
 
+set -eux
+
+pip install -e .
+
 pytest