Add tests and refactor config

tests/test_runner.sh

@@ -0,0 +1,93 @@
+#!/bin/sh
+
+script_dir=$(CDPATH="" cd -- "$(dirname -- "$0")" && pwd)
+project_dir=$(CDPATH="" cd -- "$script_dir/.." && pwd)
+
+passed=0
+failed=0
+total=0
+
+assert_eq() {
+    total=$((total + 1))
+    expected="$1"
+    actual="$2"
+    label="$3"
+
+    if [ "$expected" = "$actual" ]; then
+        passed=$((passed + 1))
+        printf "  PASS: %s\n" "$label"
+    else
+        failed=$((failed + 1))
+        printf "  FAIL: %s\n" "$label"
+        printf "    expected: %s\n" "$expected"
+        printf "    actual:   %s\n" "$actual"
+    fi
+}
+
+assert_contains() {
+    total=$((total + 1))
+    needle="$1"
+    haystack="$2"
+    label="$3"
+
+    case "$haystack" in
+        *"$needle"*)
+            passed=$((passed + 1))
+            printf "  PASS: %s\n" "$label"
+            ;;
+        *)
+            failed=$((failed + 1))
+            printf "  FAIL: %s\n" "$label"
+            printf "    expected to contain: %s\n" "$needle"
+            printf "    actual: %s\n" "$haystack"
+            ;;
+    esac
+}
+
+assert_file_exists() {
+    total=$((total + 1))
+    path="$1"
+    label="$2"
+
+    if [ -f "$path" ]; then
+        passed=$((passed + 1))
+        printf "  PASS: %s\n" "$label"
+    else
+        failed=$((failed + 1))
+        printf "  FAIL: %s\n" "$label"
+        printf "    file not found: %s\n" "$path"
+    fi
+}
+
+run_test_file() {
+    test_file="$1"
+    test_name=$(basename "$test_file" .sh)
+    printf "\n== %s ==\n" "$test_name"
+
+    saved_total=$total
+    saved_passed=$passed
+    saved_failed=$failed
+
+    . "$test_file"
+
+    for func in $(grep '^test_' "$test_file" | sed 's/().*//' | sort -u); do
+        $func
+    done
+
+    file_total=$((total - saved_total))
+    file_passed=$((passed - saved_passed))
+    file_failed=$((failed - saved_failed))
+    if [ "$file_total" -eq 0 ]; then
+        printf "  (no tests found)\n"
+    fi
+}
+
+for test_file in "$script_dir"/test_*.sh; do
+    [ "$(basename "$test_file")" = "test_runner.sh" ] && continue
+    run_test_file "$test_file"
+done
+
+printf "\n== Results ==\n"
+printf "  %d passed, %d failed, %d total\n" "$passed" "$failed" "$total"
+
+[ "$failed" -eq 0 ] && exit 0 || exit 1