I had been using the npm package solidity-coverage and while reading the coverage reports I came up with this E symbol. I am not sure what it means and there is no explanation in the documentation as well. Does anyone know what this means?

enter image description here

  • Revised the answer several times, so best if you read it as of now... – goodvibration May 1 at 14:07

A require(cond, msg) statement is technically a "shortcut" for:

if (cond)
    /* do some stuff */;

Hence an E in the solidity-coverage report means that although the if case has been covered, the else case has not been covered.

In your specific case, the function has been executed only with to != address(0).

In order to cover the other case, you'll need to execute it with to = address(0), for example:

try {
    await func("0x0");
    throw null;
catch (error) {
    assert(error, "Expected an error but did not get one");
    assert(error.message.startsWith("revert"), "Expected an error starting with 'revert' but got '" + error.message + "' instead");

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.