Added test on broker.subscribe & broker.unsubscribe function

[gnought]

• added tests
• fixed typings

[mcollina]

lgtm

[coveralls]

Pull Request Test Coverage Report for Build 8c2ed33ffc274ea30f571385297962df5ae6425a-PR-418

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.2%) to 96.651%

---

Files with Coverage Reduction	New Missed Lines	%
lib/handlers/connect.js	2	97.78%

Totals
Change from base Build b3f844c260f5b27106a300ba5ee549b8bbba788c:	0.2%
Covered Lines:	745
Relevant Lines:	762

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 8c2ed33ffc274ea30f571385297962df5ae6425a-PR-418

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.2%) to 96.651%

---

Files with Coverage Reduction	New Missed Lines	%
lib/handlers/connect.js	2	97.78%

Totals
Change from base Build b3f844c260f5b27106a300ba5ee549b8bbba788c:	0.2%
Covered Lines:	745
Relevant Lines:	762

---

💛 - Coveralls