diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4020820..6bd9a0b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -48,6 +48,8 @@ jobs:
                   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
             - run: just ${{ matrix.just_goals || 'build test' }}
+              env:
+                  GPTCOMMIT__OPENAI__API_KEY: ${{ secrets.GPTCOMMIT__OPENAI__API_KEY }}
 
     lint:
         runs-on: ubuntu-latest
diff --git a/Justfile b/Justfile
index e940256..94311e3 100644
--- a/Justfile
+++ b/Justfile
@@ -21,7 +21,10 @@ release:
 install:
     cargo install --path .
 
-test *args:
+e2e: install
+    sh -eux -c 'for i in ./e2e/test_*.sh ; do sh -x $i ; done'
+
+test *args: e2e
     cargo test
 alias t := test
 
diff --git a/e2e/test_config_list_get_set.sh b/e2e/test_config_list_get_set.sh
new file mode 100755
index 0000000..48a2a52
--- /dev/null
+++ b/e2e/test_config_list_get_set.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+set -eu
+
+gptcommit config list
+# assert is valid TOML
+
+gptcommit config get openai.model
+# assert default = text-davinci-003
+gptcommit config set openai.model foo
+gptcommit config get openai.model
+# assert is foo
+
+gptcommit config delete openai.model
+gptcommit config get openai.model
+# back to default
diff --git a/e2e/test_githook.sh b/e2e/test_githook.sh
new file mode 100755
index 0000000..40427b4
--- /dev/null
+++ b/e2e/test_githook.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+set -eu
+
+(
+    mkdir test_dir_foo4
+    cd test_dir_foo4
+    git init
+
+    export TEMPFILE=$(mktemp)
+    echo "foo" > $TEMPFILE
+
+    GPTCOMMIT__OPENAI__MODEL="text-ada-001" \
+    gptcommit prepare-commit-msg \
+      --git-diff-content ../tests/data/example_1.diff \
+      --commit-msg-file $TEMPFILE \
+      --commit-source ""
+
+    cat $TEMPFILE
+)
+rm -rf test_dir_foo4 
diff --git a/e2e/test_install.sh b/e2e/test_install.sh
new file mode 100755
index 0000000..e8eaf66
--- /dev/null
+++ b/e2e/test_install.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+set -eu
+
+(
+    mkdir test_dir_foo
+    cd test_dir_foo
+    git init
+    gptcommit install
+
+    # assert that git hook is installed
+    gptcommit install
+    # assert still works
+)
+rm -rf test_dir_foo ;
+
+#############################
+
+(
+    mkdir test_dir_foo2
+    cd test_dir_foo2
+    git init
+    mkdir a
+    cd a
+    gptcommit install
+)
+rm -rf test_dir_foo2
+
+#############################
+
+(
+    mkdir test_dir_foo3
+    cd test_dir_foo3
+    # no git init
+    gptcommit install ;
+)
+rm -rf test_dir_foo3
diff --git a/e2e/test_version.sh b/e2e/test_version.sh
new file mode 100755
index 0000000..2503485
--- /dev/null
+++ b/e2e/test_version.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+set -eu
+
+gptcommit --version
+# assert matches version in Cargo.toml
+
+gptcommit --help
+