diff --git a/.gitignore b/.gitignore
index 84b1e47..76b5fe4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1 @@
-/immortalize
 /work/
diff --git a/.realize.yaml b/.realize.yaml
index c00d67f..fb93879 100755
--- a/.realize.yaml
+++ b/.realize.yaml
@@ -4,6 +4,9 @@ schema:
   commands:
     build:
       status: true
+      args:
+        - -o
+        - work/immortalize
   watcher:
     extensions:
     - go
diff --git a/cloudbuild.yaml b/cloudbuild.yaml
index 1638af2..c669bc7 100644
--- a/cloudbuild.yaml
+++ b/cloudbuild.yaml
@@ -17,6 +17,11 @@ steps:
       gs://$_CACHE_BUCKET/$_GITHUB_REPO/tree/$BRANCH_NAME/$_CACHE_NAME.tar.gz \
       /var/tmp/$_CACHE_NAME.tar.gz && \
     tar xvzf /var/tmp/$_CACHE_NAME.tar.gz -C $_CACHE_BASEDIR) || exit 0
+- name: gcr.io/cloud-builders/curl
+  entrypoint: bash
+  args:
+  - -c
+  - mv $_CACHE_BASEDIR/$_CACHE_DIR/gopkg gopath/pkg || exit 0
 
 # Build
 - name: gcr.io/cloud-builders/go:debian
@@ -29,7 +34,41 @@ steps:
   - PROJECT_ROOT=$_GITHUB_REPO
   - GO111MODULE=on
 
+# Test
+- name: gcr.io/cloud-builders/npm
+  entrypoint: bash
+  args:
+  - -c
+  - |
+    mkdir -p $_CACHE_BASEDIR/$_CACHE_DIR && cd $_CACHE_BASEDIR/$_CACHE_DIR
+    if [ ! -f node_modules/.bin/bats ]; then
+      echo '{"private": true}' > package.json
+      npm install bats@$_BATS_VERSION
+    fi
+- name: gcr.io/cloud-builders/curl
+  entrypoint: bash
+  args:
+  - -c
+  - |
+    mkdir -p $_CACHE_BASEDIR/$_CACHE_DIR
+    if [ ! -f $_CACHE_BASEDIR/$_CACHE_DIR/time ]; then
+      apt-get update && apt-get install -y time
+      cp /usr/bin/time $_CACHE_BASEDIR/$_CACHE_DIR/time
+    fi
+- name: gcr.io/cloud-builders/npm
+  entrypoint: bash
+  args:
+  - -c
+  - $_CACHE_BASEDIR/$_CACHE_DIR/node_modules/.bin/bats -t test
+
 # Save cache
+- name: gcr.io/cloud-builders/curl
+  entrypoint: bash
+  args:
+  - -c
+  - |
+    mkdir -p $_CACHE_BASEDIR/$_CACHE_DIR && \
+    mv gopath/pkg $_CACHE_BASEDIR/$_CACHE_DIR/gopkg
 - name: gcr.io/cloud-builders/gsutil
   entrypoint: bash
   args:
@@ -118,9 +157,9 @@ artifacts:
 substitutions:
   _CACHE_BUCKET: kunoichimarket-cloudbuild-cache
   _ARTIFACT_BUCKET: kunoichimarket-cloudbuild-artifact
-  _CACHE_NAME: gopkg
-  _CACHE_BASEDIR: gopath
-  _CACHE_DIR: pkg
+  _CACHE_NAME: cache
+  _CACHE_BASEDIR: work
+  _CACHE_DIR: cache
   _GITHUB_REPO: github.com/kuno1/immortalize
   _GITHUB_USER: kuno1bot
   # _ENCRYPTED_GITHUB_TOKEN is generated with the following commands:
@@ -135,4 +174,5 @@ substitutions:
   _GITHUB_API: https://api.github.com/repos/kuno1/immortalize
   _GITHUB_UPLOADS: https://uploads.github.com/repos/kuno1/immortalize
   _BIN_NAME: immortalize
+  _BATS_VERSION: 1.1.0
   _MAIN_BRANCH: master
diff --git a/test-bin/command-one b/test-bin/command-one
new file mode 100755
index 0000000..9b76edf
--- /dev/null
+++ b/test-bin/command-one
@@ -0,0 +1,24 @@
+#!/bin/bash -eu
+
+# https://stackoverflow.com/questions/9256644
+trap_with_arg() {
+  func="$1" ; shift
+  for sig ; do
+    # shellcheck disable=SC2064
+    trap "$func $sig" "$sig"
+  done
+}
+
+func_trap() {
+  >&2 echo "Trapped: $1"
+  exit 1
+}
+
+trap_with_arg func_trap INT TERM EXIT
+
+for i in {1..8}; do
+  sleep 0.5
+  >&2 echo "$i / 8"
+done
+
+exit 1
diff --git a/test-bin/command-zero b/test-bin/command-zero
new file mode 100755
index 0000000..2ef405c
--- /dev/null
+++ b/test-bin/command-zero
@@ -0,0 +1,22 @@
+#!/bin/bash -eu
+
+# https://stackoverflow.com/questions/9256644
+trap_with_arg() {
+  func="$1" ; shift
+  for sig ; do
+    # shellcheck disable=SC2064
+    trap "$func $sig" "$sig"
+  done
+}
+
+func_trap() {
+  echo "Trapped: $1"
+  exit 0
+}
+
+trap_with_arg func_trap INT TERM EXIT
+
+for i in {1..8}; do
+  sleep 0.5
+  >&2 echo "$i / 8"
+done
diff --git a/test/test.bats b/test/test.bats
new file mode 100644
index 0000000..b54d184
--- /dev/null
+++ b/test/test.bats
@@ -0,0 +1,66 @@
+#!/usr/bin/env bats
+
+result () {
+  >&3 cat work/time
+  # Floor the time
+  awk '{split($0,a,"."); print a[1]}' < work/time
+}
+
+time_cmd=
+
+measure () {
+  if [ "$time_cmd" == '' ]; then
+    if [ -f /usr/bin/time ]; then
+      time_cmd=/usr/bin/time
+    elif [ -f work/cache/time ]; then
+      time_cmd=work/cache/time
+    else
+      >&3 echo 'Error: time command does not exist.'
+      exit 1
+    fi
+  fi
+
+  # Measure immortalize and redirect stdout/stderr to file descriptor 3.
+  # Details:
+  # https://github.com/bats-core/bats-core#file-descriptor-3-read-this-if-bats-hangs
+  "$time_cmd" -f '%e' -o work/time ./work/immortalize "$@" >&3 2>&1 &
+  # Store time's PID
+  echo "$!" > work/pid
+}
+
+sigterm () {
+  # Send SIGTERM to immortalize by using time's PID
+  pkill -P "$(< work/pid)"
+}
+
+# MIN -> COM
+@test "MIN -> COM" {
+  measure -min-lifetime 2 -command test-bin/command-zero
+  wait
+  [ "$(result)" == 4 ]
+}
+
+# COM -> MIN
+@test "COM -> MIN" {
+  measure -min-lifetime 6 -command test-bin/command-zero
+  wait
+  [ "$(result)" == 4 ]
+}
+
+# SIG -> MIN
+@test "SIG -> MIN" {
+  measure -min-lifetime 2 -command test-bin/command-zero
+  sleep 1
+  sigterm
+  wait
+  [ "$(result)" == 2 ]
+}
+
+# MIN -> SIG
+@test "MIN -> SIG" {
+  measure -min-lifetime 2 -command test-bin/command-zero
+  sleep 3
+  sigterm
+  wait
+  [ "$(result)" == 3 ]
+}