[Feature]: e2e Event Assertion Failure Messages Should Include Both the Expected and the Actual Event Details

[0xNeshi]

What is the feature you would like to see?

What is the feature you would like to see?

Let's say the we assert an error occurred during contract execution like:

    assert!(receipt.emits(Erc20::Transfer {
        from: alice_addr,
        to: alice_addr,
        value: one,
    }));

And let's say when running the test that this assertion fails.

Currently, this would produce the following error message:

assertion failed: receipt.emits(Erc20::Transfer {
        from: alice_addr,
        to: alice_addr,
        value: one,
    })

A much more helpful error message would also show the actual error that occurred.

Proposal (open to suggestions):

assertion failed: receipt.emits(Erc20::Transfer {
        from: alice_addr,
        to: alice_addr,
        value: one,
    })

expected:
    Erc20::Transfer {
        from: 0xF4EaCDAbEf3c8f1EdE91b6f2A6840bc2E4DD3526,
        to: 0xF4EaCDAbEf3c8f1EdE91b6f2A6840bc2E4DD3526,
        value: 1_U256,
    })
actual:
    Erc20::Transfer {
        from: 0x0000000000000000000000000000000000000000,
        to: 0xF4EaCDAbEf3c8f1EdE91b6f2A6840bc2E4DD3526,
        value: 1_U256,
    })

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