Add bash/error-handling

bash/error-handling/error_handling_test.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+@test "correct arguments" {
+  run bash error_handling.sh Alice
+
+  [ "$status" -eq 0 ]
+  [ "$output" = "Hello, Alice" ]
+}
+
+@test "one long argument" {
+  run bash error_handling.sh "Alice and Bob"
+
+  [ "$status" -eq 0 ]
+  [ "$output" = "Hello, Alice and Bob" ]
+}
+
+@test "incorrect arguments" {
+  run bash error_handling.sh Alice Bob
+
+  [ "$status" -eq 1 ]
+  [ "$output" = "Usage: ./error_handling <greetee>" ]
+}
+
+@test "print usage banner with no value given" {
+  run bash error_handling.sh
+
+  [ "$status" -eq 1 ]
+  [ "$output" = "Usage: ./error_handling <greetee>" ]
+}
+
+@test "empty argument" {
+  run bash error_handling.sh ""
+
+  [ "$status" -eq 0 ]
+  [ "$output" = "Hello, " ]
+}