Use redisFixture in all tests

[shacharPash]

Use redisFixture in all tests like this:

var db = redisFixture.Redis.GetDatabase();

instead of this:

var redis = ConnectionMultiplexer.Connect("localhost:6379");
var db = redis.GetDatabase();

This allows us more control over the tests, such as setting a default value for the connection and the ability to test on a variety of connections/ports

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (980a77c) 94.16% compared to head (ee4ec88) 94.16%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #244   +/-   ##
=======================================
  Coverage   94.16%   94.16%           
=======================================
  Files          85       85           
  Lines        5178     5178           
  Branches      487      487           
=======================================
  Hits         4876     4876           
  Misses        178      178           
  Partials      124      124           

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[gerzse]

I realized something: these tests inside Doc might be written in such a way that the source code can be used inside documentation. I see there are special comments, like // REMOVE_START and // REMOVE_END, it looks like the source code is processed via some tool.

In that case, we should not use the fixture for these Doc tests, because the sample code would not work if someone tries to use it as-such.