refactor(material/snack-bar): refactor variable type to const in snack-bar component unit tests

[nitinmalave]

Opening this PR as it is required to:

• Refactor variables in snack-bar component unit tests to have constant type instead of let as this variables are not getting re-initialize during the test life-time.
• All tests within a spec should be consistent with all other tests in file.

[crisbeto]

The change looks good, but the branch needs to be rebased.

[devversion]

Yeah, changes in 425edb5 look good. The PR shows more commits though, most likely because it isn't rebased on top of master. Can you please fix that?

[nitinmalave]

Hello @devversion, i am pretty new to this project and trying to contribute for first time in angular materials. I am not fully aware about rebasing branches in git. Can you please help me with the process to follow in order to get this commit merged in master?

Previously i did "git rebase master" on my local branch and pushed the changes on remote branch. What can be done from here? Any help would be appreciated. Thank you!

[nitinmalave]

Hello @devversion @crisbeto, I have rebased the branch on top of master and pushed all changes. All checks have passed as of now. Please take a look of PR. Thanks!

[crisbeto]

LGTM

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