TDDing a micro test framework using itself to test itself

test.cfm

<cfscript>
    runTest("it uses a function called runTest", ()=>{})

    
    savecontent variable="testOutput" {
        runTest("runTest requires and displays a passed-in message describing the test, followed by a line break", ()=>{})
    }
    writeOutput(testOutput)
    if (testOutput != "runTest requires and displays a passed-in message describing the test, followed by a line break<br>") {
        throw(type="AssertionException", message="runTest did not output the message and line break")
    }


    savecontent variable="testOutput" {
        runTest("runTest requires and callback which it executes", () => {
            throw(type="AssertionException", message="callback was executed")
        })
    }
    writeOutput(testOutput)
    if (testOutput != "runTest requires and callback which it executes<br>callback was executed<br>") {
        throw(type="AssertionException", message="callback was not executed")
    }

    runTest("runTest handles exceptions gracefully, reporting the exception message", () => {
        throw("An exception was thrown in the callback")
    })
</cfscript>

<cfscript>
    function runTest(required string message, required function testCase){
        writeOutput("#message#<br>")
        try {
            testCase()
        } catch (any e) {
            writeOutput("#e.message#<br>")
        }
    }
</cfscript>