fix(engine): missing route params for CreateTestContext (#2778)

[RoCry]

This PR trying to fix the issue we met, which exact same with #2778

If you guys have better idea to fix this, just let me know.

[codecov]

Codecov Report

Merging #2803 (621fc9d) into master (b57163a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2803   +/-   ##
=======================================
  Coverage   98.37%   98.38%           
=======================================
  Files          43       43           
  Lines        3148     3153    +5     
=======================================
+ Hits         3097     3102    +5     
  Misses         38       38           
  Partials       13       13           

Flag	Coverage Δ
go-1.15	98.38% <100.00%> (+<0.01%)	⬆️
go-1.16	98.35% <100.00%> (+<0.01%)	⬆️
go-1.17	98.28% <100.00%> (+<0.01%)	⬆️
go-1.18	98.28% <100.00%> (+<0.01%)	⬆️
macos-latest	98.38% <100.00%> (+<0.01%)	⬆️
nomsgpack	98.35% <100.00%> (+<0.01%)	⬆️
ubuntu-latest	98.38% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
gin.go	99.18% <100.00%> (ø)
test_helpers.go	100.00% <100.00%> (ø)

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[shrike42]

Had the same problem when trying to follow the examples.

The fix you outline would work but I think at that point especially with the need to create a separate engine to get the valid maxParam value one could just use a different approach using ServeHTTP and forget CreateTestContext.

Tests could be written as follows based on your example:

w := httptest.NewRecorder()
engine := New()

// At this point add the route(s) to test
engine.GET("/:action/:name", func(ctx *Context) {
ctx.String(http.StatusOK, "%s %s", ctx.Param("action"), ctx.Param("name"))
})
r = http.NewRequest(http.MethodGet, "/hello/gin", nil)

engine.ServeHTTP(w,r)

assert.Equal(t, http.StatusOK, w.Code)
assert.Equal(t, "hello gin", w.Body.String())

Admittedly this does not use the test context at all but I wonder if using CreateTestContext is even a good idea one could say that ServeHTTP is a better approach. Like the context method this does not start the engine.

[appleboy]

@RoCry Please fix the conflicts.

[nmfzone]

Is there any plan to release this soon?

Or is there any workaround?

[appleboy]

we will release the feature in v1.8.2

[appleboy]

https://github.com/gin-gonic/gin/releases/tag/v1.8.2