.should() should fail when only chainer getters supplied

[dwelle]

Current behavior:

If user writes .should( chainer, value ) where chainer consists only of a chainer getter (e.g. to, be, is...), the command silently passes.

Desired behavior:

Instead, it should throw/fail because it's not a valid assertion. It's the same as if the user wrote expect( value ).be( value ) which is invalid chai assertion.

How to reproduce:

cy.wrap( 42 ).should('be', 100);

• Cypress Version: 1.0.3

[flotwig]

This is pretty confusing, just ran into another user having this issue: https://stackoverflow.com/questions/56690772/how-do-i-wait-for-the-callback-passed-to-a-cypress-custom-command-to-finish-befo/56690824#56690824

[cypress-bot]

Released in 5.1.0.

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