fea: config: add esp and proxy tests.

[codecov-commenter]

Codecov Report

Base: 7.49% // Head: 10.03% // Increases project coverage by +2.54% :tada:

Coverage data is based on head (43eb239) compared to base (1d748c3). Patch coverage: 70.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #13 +/- ## ========================================== + Coverage 7.49% 10.03% +2.54% ========================================== Files 72 72 Lines 7084 7084 ========================================== + Hits 531 711 +180 + Misses 6525 6334 -191 - Partials 28 39 +11 ``` | [Impacted Files](https://codecov.io/gh/luscis/openlan/pull/13?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis) | Coverage Δ | | |---|---|---| | [pkg/config/proxy.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NvbmZpZy9wcm94eS5nbw==) | `24.00% <0.00%> (+24.00%)` | :arrow_up: | | [pkg/config/switch.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NvbmZpZy9zd2l0Y2guZ28=) | `35.23% <0.00%> (ø)` | | | [pkg/cache/point.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NhY2hlL3BvaW50Lmdv) | `17.39% <100.00%> (+17.39%)` | :arrow_up: | | [pkg/config/esp.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NvbmZpZy9lc3AuZ28=) | `70.83% <100.00%> (+70.83%)` | :arrow_up: | | [pkg/cache/user.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NhY2hlL3VzZXIuZ28=) | `4.86% <0.00%> (+4.86%)` | :arrow_up: | | [pkg/cache/neighbor.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NhY2hlL25laWdoYm9yLmdv) | `13.33% <0.00%> (+13.33%)` | :arrow_up: | | [pkg/cache/online.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NhY2hlL29ubGluZS5nbw==) | `14.81% <0.00%> (+14.81%)` | :arrow_up: | | [pkg/cache/link.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NhY2hlL2xpbmsuZ28=) | `19.04% <0.00%> (+19.04%)` | :arrow_up: | | [pkg/cache/esp.go](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis#diff-cGtnL2NhY2hlL2VzcC5nbw==) | `19.44% <0.00%> (+19.44%)` | :arrow_up: | | ... and [3 more](https://codecov.io/gh/luscis/openlan/pull/13/diff?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis) | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=luscis)

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