Make sure time.Time comparison produces a helpful diff. closes #989

[HaraldNordgren]

Make sure time.Time comparison produces a helpful diff. closes #989

Summary

Make sure time.Time comparison produces a helpful diff
again. This partially reverses the changes in #895 for
time.Time and allows it to be easily expanded for more
types in the future if needed.

Changes

Analyzes the type when diffing, and uses a different
Spew config for time.Time

Introduce a test for diffing time.Time

Motivation

See bug #989

Related issues

Closes #989

[HaraldNordgren]

Ping @AlekSi @Jozmen @boyan-soubachov

[HaraldNordgren]

This fixes the issue introduced for time.Time in #895 :)

Ping @luan @glesica

[HaraldNordgren]

Hi, could we please get some attention on this one? :)

[boyan-soubachov]

Thank you for fixing this :)

[HaraldNordgren]

@boyan-soubachov Thanks for approving :))

[HaraldNordgren]

@boyan-soubachov Can we please get a v1.7.1 release as well? :)

[boyan-soubachov]

@boyan-soubachov Can we please get a v1.7.1 release as well? :)

I will keep this in master for now in order to get feedback and find out if there are any issues. You can just use testify@master in your go.mod to use the latest master of testify (or if you want to pin to a commit digest, that should work too if I remember correctly)