Add .commandWas(cmd) api

                    // !! converts any value to a boolean (not a special operator, just two ! (boolean not) operators in series)

                    const result = !!predicate(latestEntry.output)

                    verifyHandler(result)

                }, 200)

            },

            /**

             * Verify the command matches a certain condition.

             * 

             * - If param is a string, check that the command is exactly equal to param

             * - If param is a function, the function is called with the actual command as parameter, and we check it returns

             *   a truthy value.

             * 

             * @param {Function|String} param String to exactly match, or predicate function

             */

            commandWas(param) {

                // Wait for 200ms to ensure that the VM has processed the input and written some

                // output to the terminal

                setTimeout(() => {

                    const terminalContents = getTerminalContents()

                    const latestEntry = terminalContents[terminalContents.length - 1]

                    // Poor man's switch-case: depending on the "typeof param", a different verification predicate is chosen

                    const predicate = {

                        "function": param,

                        "string": (actualInput) => actualInput === param,

                    }[typeof param]

                    const result = !!predicate(latestEntry.input)

                    verifyHandler(result)

                }, 200)

            }