fix(tree): reassign fullpath when register new node which the same current node

[vinhha96]

Proposed changes

While using func context.FullPath(), I encountered an issue that it always returns previous registered parent path. It's fine when I change the registration order.

Example:

func (s *testSuite) registerTest() {
	s.router.GET("/user/:id/status", s.processWithStatus())
	s.router.GET("/user/:id", s.processWithID())
}

func (s *testSuite) processWithStatus() gin.HandlerFunc {
	return func(c *gin.Context) {
		logger.Infof("XXX - FullPath /user/:id/status ---> %s", c.FullPath())
		return
	}
}

func (s *testSuite) processWithID() gin.HandlerFunc {
	return func(c *gin.Context) {
		logger.Infof("XXX - FullPath /user/:id ---> %s", c.FullPath())
		return
	}
}

Result:

XXX - FullPath /user/:id/status ---> /service/api/v1/user/:id/status
XXX - FullPath /user/:id ---> /service/api/v1/user/:id/status

But, when I register with different the order of router, such as:

func (s *testSuite) registerTest() {
	s.router.GET("/user/:id", s.processWithID())
	s.router.GET("/user/:id/status", s.processWithStatus())
}

It's every thing so ok.

I have fix this bug and updated the test case.
Hope you spend your time review and accept my pull request with this issue.

Types of changes

• Bugfix (non-breaking change which fixes an issue)

Checklist

• Lint and unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #2366 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2366   +/-   ##
=======================================
  Coverage   98.63%   98.63%           
=======================================
  Files          41       41           
  Lines        2349     2350    +1     
=======================================
+ Hits         2317     2318    +1     
  Misses         18       18           
  Partials       14       14           

Impacted Files	Coverage Δ
tree.go	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d17270d...a43651d. Read the comment docs.

[vinhha96]

Hi @appleboy , @thinkerou. Please help me review this pull request.
Many thanks.

[appleboy]

put these changes back and add a new route as above.

[vinhha96]

Done @appleboy. I added new route.

[thinkerou]

lgtm