diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c4ac375..a988f44 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -208,6 +208,13 @@ integration-test-oni-bats:
     - package
   script: make integration-test-oni-bats TEST_ARCHIVE=$(realpath bin/)
 
+integration-test-oni-conf:
+  stage: integration-test
+  image: registry.gitlab.com/ryuslash/emacs-config
+  dependencies:
+    - package
+  script: make integration-test-oni-conf TEST_ARCHIVE=$(realpath bin/)
+
 integration-test-oni-bookmark:
   stage: integration-test
   image: registry.gitlab.com/ryuslash/emacs-config
diff --git a/test/integration/oni-conf.bats b/test/integration/oni-conf.bats
new file mode 100644
index 0000000..1f9f2d3
--- /dev/null
+++ b/test/integration/oni-conf.bats
@@ -0,0 +1,11 @@
+#!/usr/bin/env bats
+
+@test "Opening a .conf file loads oni-conf" {
+    run emacs -batch -l package -f package-initialize \
+        -visit test.conf \
+        -eval "(prin1 (featurep 'oni-conf))"
+
+    echo "$output"
+
+    [ "$output" = "t" ]
+}