Why is this Codecov report saying that I've reduced my coverage when I don't believe I have?

Question

I'm finding CodeCov reports hard to read at times and are potentially misleading/providing incorrect information.

I'm hoping someone could confirm/deny this assertion.

With this example PR, it's saying that I'm making things worse when I can't see how?

Current scenario.

PR: Dependabot wants to bump a Nuget package from 3.0.12 -> 3.0.14.

Ok. so this report is saying that the entire project is:

• 46% covered
• we've dropped -23.9%
• it was originally .... 69.9% in the previous commit??

OK, let's look at the diff.

So this diff says: 1 file only. and it's .. "untracked" ? (not sure what that means).

So with this one file it saying my coverage is now dropping by 24%.

Let's look at the commit.

OK, so this is THE ENTIRE PR. It's just a version number change. no other files in the PR.

Now let's go back and see what Codecov is looking at....

• an21ad is the latest commit on origin/master. so it's HEAD.
• b3d5da6 is the PR.

ok.. so that's kewl.. but why is it saying the change is so massive for code coverage loss?

Now look at this ...

and

wait what? It's saying:

• I have more than 99 difference changes between my PR and origin/master?
• I have 69 files changed between my PR and origin/master

But my commit is only ONE file!

Alright, let's look at one of these random files which is supposedly 'different':

OK, I really don't know how to read this change. It's saying that these two lines have changed but they really haven't changed.

Can anyone please explain what is Codecov doing/thinking?

I was under the impression that this commit should not change the coverage at all.

SIDENOTE: I'm using flags so I'm hoping that isn't messing things up.