docs-bug(button): button-harness-example has wrong assignment

[Bishares]

Documentation Feedback

I just noticed an error in your button-harness-example.spec.ts

In line 11 it has the following assignment

let buttonHarness = MatButtonHarness;

which was meant to be a declaration

let buttonHarness: MatButtonHarness;

But it turns out the buttonHarness variable is never assigned. The usages of that variable later on in the it() functions will also not work. The variable is not needed at all!

The it() blocks can just use MatButtonHarness.with() directly.

The following changes to that spec file should be made

1. remove the let buttonHarness = MatButtonHarness; assignment in line 11
2. adjust the usages of the buttonHarness variables in the second and third it() function. from buttonHarness.with() to MatButtonHarness.with()

Affected documentation page

https://material.angular.io/components/button/examples#button-harness

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