test: splits monolith into a bats file for each subcommand

test/mute.bats

@@ -0,0 +1,24 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test "mute creates muted file" {
+  run_nag mute
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "muted" ]]
+  [ -f "${NAG_DIR}/muted" ]
+}
+
+@test "unmute removes muted file" {
+  run_nag mute
+  run_nag unmute
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "unmuted" ]]
+  [ ! -f "${NAG_DIR}/muted" ]
+}
+
+@test "unmute when not muted says so" {
+  run_nag unmute
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "not muted" ]]
+}