Make dotify-action error out when given invalid actions

src/lib/dotify-action.sh

@@ -7,5 +7,11 @@ dotify-action() {
     action="$DOTIFY_OPT_DEFAULT_ACTION"
   fi
 
+  ! valid_action="$(command -v "dotify-action-${action}")"
+  if [ -z "$valid_action" ]; then
+    echo "ERROR: \"$action\" is not a valid action." >&2
+    return 1
+  fi
+
   dotify-action-${action} "$source" "$target"
 }

test/lib/dotify-action-test.sh

@@ -0,0 +1,29 @@
+#! /usr/bin/env bash
+source "../test-helper.sh"
+source "../../src/lib/dotify-action.sh"
+
+#
+# dotify-action() tests
+#
+
+# Set required option ENV
+DOTIFY_OPT_DEFAULT_ACTION="link"
+
+# Simple mock for link action.
+dotify-action-link() {
+  echo "link stub: $@"
+}
+
+
+# Given a specific action.
+assert "dotify-action link ackrc .ackrc" "link stub: ackrc .ackrc"
+
+# Given "default" action, it uses configured default action.
+assert "dotify-action default ackrc .ackrc" "link stub: ackrc .ackrc"
+
+# Given a invalid action.
+assert_raises "dotify-action foo ackrc .ackrc" 1
+assert "dotify-action foo ackrc .ackrc" ""
+assert "dotify-action foo ackrc .ackrc 2>&1" "ERROR: \"foo\" is not a valid action."
+
+assert_end "dotify-action()"