Parallel Letter Frequency

bash/hello-world/hello_world.bats

@@ -0,0 +1,14 @@
+#!/usr/bin/env bats
+load bats-extra
+
+# local version: 1.1.0.0
+
+@test "Say Hi!" {
+  run bash hello_world.sh
+
+  # the program's exit status should be success (0)
+  assert_success
+
+  # program's output should be the expected text
+  assert_output "Hello, World!"
+}