✅ Add tests

Author: nkmr-jp

tests/api-to-go.bats

@@ -29,3 +29,42 @@ teardown(){
   run eval "$COMMAND"
   [ "$status" -eq 0 ]
 }
+
+@test "Command with custom headers" {
+  HEADERS='{"Content-Type": "application/json"}'
+  COMMAND="$API_TO_GO --headers '$HEADERS' $BASE_URL/todos/1"
+  run eval "$COMMAND"
+  [ "$status" -eq 0 ]
+}
+
+@test "Command with POST method" {
+  DATA='{"title": "foo", "body": "bar", "userId": 1}'
+  COMMAND="$API_TO_GO --method POST $BASE_URL/posts '$DATA'"
+  run eval "$COMMAND"
+  [ "$status" -eq 0 ]
+}
+
+@test "Command with GET method" {
+  COMMAND="$API_TO_GO --method GET $BASE_URL/posts/1"
+  run eval "$COMMAND"
+  [ "$status" -eq 0 ]
+}
+
+@test "Debug mode activation" {
+  COMMAND="$API_TO_GO -D $BASE_URL/posts"
+  run eval "$COMMAND"
+  [ "$status" -eq 0 ]
+}
+
+@test "Display help message" {
+  COMMAND="$API_TO_GO --help"
+  run eval "$COMMAND"
+  [ "$status" -eq 0 ]
+  [ "${lines[0]}" = "Usage: api-to-go [options] <url> [body]" ]
+}
+
+@test "Display version information" {
+  COMMAND="$API_TO_GO --version"
+  run eval "$COMMAND"
+  [ "$status" -eq 0 ]
+}