fix flaky test TestRuntimeAPILoopWithConcurrency

[shogo82148]

Issue #, if available:

N/A

Description of changes:

The TestRuntimeAPILoopWithConcurrency fails occasionally.

$ go test -timeout 30s -run ^TestRuntimeAPILoopWithConcurrency$ github.com/aws/aws-lambda-go/lambda -v -count 100
(...snip..)
=== RUN   TestRuntimeAPILoopWithConcurrency
2025/12/11 10:27:50 {"errorMessage":"error-request-7","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-6","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-16","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-17","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-26","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-27","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-36","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-37","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-47","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-46","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-57","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-56","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-66","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-67","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-76","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-77","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-86","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-96","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-87","errorType":"errorString"}
2025/12/11 10:27:50 {"errorMessage":"error-request-97","errorType":"errorString"}
    invoke_loop_gte_go122_test.go:69:
        	Error Trace:	invoke_loop_gte_go122_test.go:69
        	Error:      	Not equal:
        	            	expected: 100
        	            	actual  : 99
        	Test:       	TestRuntimeAPILoopWithConcurrency
    invoke_loop_gte_go122_test.go:75:
        	Error Trace:	invoke_loop_gte_go122_test.go:75
        	Error:      	"map["request-0":%!s(int=1) "request-1":%!s(int=1) "request-10":%!s(int=1) "request-11":%!s(int=1) "request-12":%!s(int=1) "request-13":%!s(int=1) "request-14":%!s(int=1) "request-15":%!s(int=1) "request-18":%!s(int=1) "request-19":%!s(int=1) "request-2":%!s(int=1) "request-20":%!s(int=1) "request-21":%!s(int=1) "request-22":%!s(int=1) "request-23":%!s(int=1) "request-24":%!s(int=1) "request-25":%!s(int=1) "request-28":%!s(int=1) "request-29":%!s(int=1) "request-3":%!s(int=1) "request-30":%!s(int=1) "request-31":%!s(int=1) "request-32":%!s(int=1) "request-33":%!s(int=1) "request-34":%!s(int=1) "request-35":%!s(int=1) "request-38":%!s(int=1) "request-39":%!s(int=1) "request-4":%!s(int=1) "request-40":%!s(int=1) "request-41":%!s(int=1) "request-42":%!s(int=1) "request-43":%!s(int=1) "request-44":%!s(int=1) "request-45":%!s(int=1) "request-48":%!s(int=1) "request-49":%!s(int=1) "request-5":%!s(int=1) "request-50":%!s(int=1) "request-51":%!s(int=1) "request-52":%!s(int=1) "request-53":%!s(int=1) "request-54":%!s(int=1) "request-55":%!s(int=1) "request-58":%!s(int=1) "request-59":%!s(int=1) "request-60":%!s(int=1) "request-61":%!s(int=1) "request-62":%!s(int=1) "request-63":%!s(int=1) "request-64":%!s(int=1) "request-65":%!s(int=1) "request-68":%!s(int=1) "request-69":%!s(int=1) "request-70":%!s(int=1) "request-71":%!s(int=1) "request-72":%!s(int=1) "request-73":%!s(int=1) "request-74":%!s(int=1) "request-75":%!s(int=1) "request-78":%!s(int=1) "request-79":%!s(int=1) "request-8":%!s(int=1) "request-80":%!s(int=1) "request-81":%!s(int=1) "request-82":%!s(int=1) "request-83":%!s(int=1) "request-84":%!s(int=1) "request-85":%!s(int=1) "request-88":%!s(int=1) "request-89":%!s(int=1) "request-9":%!s(int=1) "request-90":%!s(int=1) "request-91":%!s(int=1) "request-92":%!s(int=1) "request-93":%!s(int=1) "request-94":%!s(int=1) "request-95":%!s(int=1) "request-98":%!s(int=1) {"errorMessage":"error-request-16","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-17","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-26","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-27","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-36","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-37","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-46","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-47","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-56","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-57","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-6","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-66","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-67","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-7","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-76","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-77","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-86","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-87","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-96","errorType":"errorString"}:%!s(int=1) {"errorMessage":"error-request-97","errorType":"errorString"}:%!s(int=1)]" should have 100 item(s), but has 99
        	Test:       	TestRuntimeAPILoopWithConcurrency
    invoke_loop_gte_go122_test.go:84:
        	Error Trace:	invoke_loop_gte_go122_test.go:84
        	Error:      	map[string]int{"\"request-0\"":1, "\"request-1\"":1, "\"request-10\"":1, "\"request-11\"":1, "\"request-12\"":1, "\"request-13\"":1, "\"request-14\"":1, "\"request-15\"":1, "\"request-18\"":1, "\"request-19\"":1, "\"request-2\"":1, "\"request-20\"":1, "\"request-21\"":1, "\"request-22\"":1, "\"request-23\"":1, "\"request-24\"":1, "\"request-25\"":1, "\"request-28\"":1, "\"request-29\"":1, "\"request-3\"":1, "\"request-30\"":1, "\"request-31\"":1, "\"request-32\"":1, "\"request-33\"":1, "\"request-34\"":1, "\"request-35\"":1, "\"request-38\"":1, "\"request-39\"":1, "\"request-4\"":1, "\"request-40\"":1, "\"request-41\"":1, "\"request-42\"":1, "\"request-43\"":1, "\"request-44\"":1, "\"request-45\"":1, "\"request-48\"":1, "\"request-49\"":1, "\"request-5\"":1, "\"request-50\"":1, "\"request-51\"":1, "\"request-52\"":1, "\"request-53\"":1, "\"request-54\"":1, "\"request-55\"":1, "\"request-58\"":1, "\"request-59\"":1, "\"request-60\"":1, "\"request-61\"":1, "\"request-62\"":1, "\"request-63\"":1, "\"request-64\"":1, "\"request-65\"":1, "\"request-68\"":1, "\"request-69\"":1, "\"request-70\"":1, "\"request-71\"":1, "\"request-72\"":1, "\"request-73\"":1, "\"request-74\"":1, "\"request-75\"":1, "\"request-78\"":1, "\"request-79\"":1, "\"request-8\"":1, "\"request-80\"":1, "\"request-81\"":1, "\"request-82\"":1, "\"request-83\"":1, "\"request-84\"":1, "\"request-85\"":1, "\"request-88\"":1, "\"request-89\"":1, "\"request-9\"":1, "\"request-90\"":1, "\"request-91\"":1, "\"request-92\"":1, "\"request-93\"":1, "\"request-94\"":1, "\"request-95\"":1, "\"request-98\"":1, "{\"errorMessage\":\"error-request-16\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-17\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-26\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-27\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-36\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-37\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-46\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-47\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-56\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-57\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-6\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-66\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-67\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-7\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-76\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-77\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-86\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-87\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-96\",\"errorType\":\"errorString\"}":1, "{\"errorMessage\":\"error-request-97\",\"errorType\":\"errorString\"}":1} does not contain "\"request-99\""
        	Test:       	TestRuntimeAPILoopWithConcurrency
--- FAIL: TestRuntimeAPILoopWithConcurrency (0.22s)
(...snip..)
--- PASS: TestRuntimeAPILoopWithConcurrency (0.27s)
FAIL
FAIL	github.com/aws/aws-lambda-go/lambda	23.937s
FAIL

It is because the "END THE TEST!" signal is canceling out the normal GET request.
I've made it so that the "END THE TEST!" signal is sent only after other requests have finished successfully.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.22%. Comparing base (de51f68) to head (d3e6022).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #606      +/-   ##
==========================================
- Coverage   73.30%   71.22%   -2.08%     
==========================================
  Files          26       35       +9     
  Lines        1487     1630     +143     
==========================================
+ Hits         1090     1161      +71     
- Misses        324      395      +71     
- Partials       73       74       +1     

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[bmoffatt]

Thanks!