test(better-cat): add tests for exercise

sh/tests/better-cat_test.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+script_dir=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)
+
+rm -rf better-cat-files
+mkdir better-cat-files
+cd better-cat-files
+
+for i in {1..3}; do
+    echo "This is line $i of file2" >> "file2.txt"
+done
+
+for i in {1..10}; do
+    echo "This is line $i of file3" >> "file3.txt"
+    echo "This is line $i of commented" >> "commented.txt"
+done
+
+echo "This is the content of file1" > "file1.txt"
+echo "# commented" > "commented.txt"
+
+challenge() {
+    submitted=$(bash "$script_dir"/student/better-cat.sh "$@")
+    expected=$(bash "$script_dir"/solutions/better-cat.sh "$@")
+    diff <(echo "$submitted") <(echo "$expected") 
+}
+
+challenge "file1.txt"
+challenge "file1.txt" "file2.txt" "file3.txt"
+challenge *.txt
+challenge
+challenge -c "commented.txt"
+challenge -l "file1.txt"
+challenge -r "file1.txt"
+challenge -cl "commented.txt"
+# add test for file that doesn't exist
+
+cd ..
+rm -rf better-cat-files