diff --git a/test/enable.bats b/test/enable.bats
new file mode 100644
index 0000000..cba246d
--- /dev/null
+++ b/test/enable.bats
@@ -0,0 +1,210 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts enable` ##############################################################
+
+@test "\`enable\` with no arguments exits with status 1." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable example.com
+  }
+
+  run "$_HOSTS" enable
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  [[ $status -eq 1 ]]
+}
+
+@test "\`enable\` with no argument does not change the hosts file." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable example.com
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "$_HOSTS" enable
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  [[ "$(cat "${HOSTS_PATH}")" == "${_original}" ]]
+}
+
+@test "\`enable\` with no arguments prints help information." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable example.com
+  }
+
+  run "$_HOSTS" enable
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts enable ( <ip> | <hostname> | <search string> )" ]]
+}
+
+# `hosts enable <ip>` #########################################################
+
+@test "\`enable <ip>\` exits with status 0." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable 127.0.0.2
+  }
+
+  run "$_HOSTS" enable 127.0.0.2
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  [[ $status -eq 0 ]]
+}
+
+@test "\`enable <ip>\` updates the hosts file." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable 0.0.0.0
+    run "$_HOSTS" disable 127.0.0.2
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "$_HOSTS" enable 127.0.0.2
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "#disabled: 0.0.0.0	example.com" ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" == "#disabled: 0.0.0.0	example.net" ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" == "127.0.0.2	example.com" ]]
+}
+
+@test "\`enable <ip>\` enables all matches." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable 0.0.0.0
+    run "$_HOSTS" disable 127.0.0.2
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "$_HOSTS" enable 0.0.0.0
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  _compare \
+    "${_original}" \
+    "$(cat "${HOSTS_PATH}")"
+  _compare \
+    "'0.0.0.0	example.com'" \
+    "'$(sed -n '11p' "${HOSTS_PATH}")'"
+  _compare \
+    "'0.0.0.0	example.net'" \
+    "'$(sed -n '12p' "${HOSTS_PATH}")'"
+  _compare \
+    "'#disabled: 127.0.0.2	example.com'" \
+    "'$(sed -n '13p' "${HOSTS_PATH}")'"
+
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "0.0.0.0	example.com" ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" == "0.0.0.0	example.net" ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" == "#disabled: 127.0.0.2	example.com" ]]
+}
+
+@test "\`disable <ip>\` prints feedback." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable 127.0.0.2
+  }
+
+  run "$_HOSTS" enable 127.0.0.2
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  [[ "${lines[0]}" == "Enabling:" ]]
+  [[ "${lines[1]}" == "127.0.0.2	example.com" ]]
+}
+
+# `hosts enable <hostname>` ###################################################
+
+@test "\`enable <hostname>\` exits with status 0." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable 0.0.0.0
+  }
+
+  run "$_HOSTS" enable example.net
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  [[ $status -eq 0 ]]
+}
+
+@test "\`enable <hostname>\` updates the hosts file." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable 0.0.0.0
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "$_HOSTS" enable example.net
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "#disabled: 0.0.0.0	example.com" ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" == "0.0.0.0	example.net" ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" == "127.0.0.2	example.com" ]]
+}
+
+@test "\`enable <hostname>\` enables all matches." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable 0.0.0.0
+    run "$_HOSTS" disable 127.0.0.2
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "$_HOSTS" enable example.com
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  _compare \
+    "${_original}" \
+    "$(cat "${HOSTS_PATH}")"
+  _compare \
+    "'0.0.0.0	example.com'" \
+    "'$(sed -n '11p' "${HOSTS_PATH}")'"
+  _compare \
+    "'#disabled: 0.0.0.0	example.net'" \
+    "'$(sed -n '12p' "${HOSTS_PATH}")'"
+  _compare \
+    "'127.0.0.2	example.com'" \
+    "'$(sed -n '13p' "${HOSTS_PATH}")'"
+
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "0.0.0.0	example.com" ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" == "#disabled: 0.0.0.0	example.net" ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" == "127.0.0.2	example.com" ]]
+}
+
+@test "\`disable <hostname>\` prints feedback." {
+  {
+    run "$_HOSTS" add 0.0.0.0 example.com
+    run "$_HOSTS" add 0.0.0.0 example.net
+    run "$_HOSTS" add 127.0.0.2 example.com
+    run "$_HOSTS" disable 0.0.0.0
+  }
+
+  run "$_HOSTS" enable example.net
+  printf "\$status: %s\n" "$status"
+  printf "\$output: '%s'\n" "$output"
+  [[ "${lines[0]}" == "Enabling:" ]]
+  [[ "${lines[1]}" == "0.0.0.0	example.net" ]]
+}