TestCreateProjectがたまに落ちる

再テストすると大体通る

--- FAIL: TestCreateProject (0.29s)
    --- FAIL: TestCreateProject/201_with_kanji (0.00s)
        project_test.go:202: 
            	Error Trace:	/home/runner/work/traPortfolio/traPortfolio/integration_tests/testutils/assert.go:16
            	            				/home/runner/work/traPortfolio/traPortfolio/integration_tests/handler/project_test.go:202
            	Error:      	Not equal: 
            	            	expected: 201
            	            	actual  : 400
            	Test:       	TestCreateProject/201_with_kanji
        project_test.go:202: 
            	Error Trace:	/home/runner/work/traPortfolio/traPortfolio/integration_tests/testutils/assert.go:33
            	            				/home/runner/work/traPortfolio/traPortfolio/integration_tests/handler/project_test.go:202
            	Error:      	Not equal: 
            	            	expected: map[string]interface {}{"duration":map[string]interface {}{"since":map[string]interface {}{"semester":0, "year":2018}, "until":map[string]interface {}{"semester":0, "year":2018}}, "id":"00000000-0000-0000-0000-000000000000", "name":"亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜"}
            	            	actual  : map[string]interface {}{"message":"Bad Request: argument error"}
            	            	
            	            	Diff:
            	            	--- Expected
            	            	+++ Actual
            	            	@@ -1,14 +1,3 @@
            	            	-(map[string]interface {}) (len=3) {
            	            	- (string) (len=8) "duration": (map[string]interface {}) (len=2) {
            	            	-  (string) (len=5) "since": (map[string]interface {}) (len=2) {
            	            	-   (string) (len=8) "semester": (float64) 0,
            	            	-   (string) (len=4) "year": (float64) 2018
            	            	-  },
            	            	-  (string) (len=5) "until": (map[string]interface {}) (len=2) {
            	            	-   (string) (len=8) "semester": (float64) 0,
            	            	-   (string) (len=4) "year": (float64) 2018
            	            	-  }
            	            	- },
            	            	- (string) (len=2) "id": (string) (len=36) "00000000-0000-0000-0000-000000000000",
            	            	- (string) (len=4) "name": (string) (len=96) "亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜亜"
            	            	+(map[string]interface {}) (len=1) {
            	            	+ (string) (len=7) "message": (string) (len=27) "Bad Request: argument error"
            	            	 }
            	Test:       	TestCreateProject/201_with_kanji
    --- FAIL: TestCreateProject/201 (0.00s)
        project_test.go:202: 
            	Error Trace:	/home/runner/work/traPortfolio/traPortfolio/integration_tests/testutils/assert.go:16
            	            				/home/runner/work/traPortfolio/traPortfolio/integration_tests/handler/project_test.go:202
            	Error:      	Not equal: 
            	            	expected: 201
            	            	actual  : 400
            	Test:       	TestCreateProject/201
        project_test.go:202: 
            	Error Trace:	/home/runner/work/traPortfolio/traPortfolio/integration_tests/testutils/assert.go:33
            	            				/home/runner/work/traPortfolio/traPortfolio/integration_tests/handler/project_test.go:202
            	Error:      	Not equal: 
            	            	expected: map[string]interface {}{"duration":map[string]interface {}{"since":map[string]interface {}{"semester":0, "year":2018}, "until":map[string]interface {}{"semester":0, "year":2018}}, "id":"00000000-0000-0000-0000-000000000000", "name":"9gAmHq6MS9"}
            	            	actual  : map[string]interface {}{"message":"Bad Request: argument error"}
            	            	
            	            	Diff:
            	            	--- Expected
            	            	+++ Actual
            	            	@@ -1,14 +1,3 @@
            	            	-(map[string]interface {}) (len=3) {
            	            	- (string) (len=8) "duration": (map[string]interface {}) (len=2) {
            	            	-  (string) (len=5) "since": (map[string]interface {}) (len=2) {
            	            	-   (string) (len=8) "semester": (float64) 0,
            	            	-   (string) (len=4) "year": (float64) 2018
            	            	-  },
            	            	-  (string) (len=5) "until": (map[string]interface {}) (len=2) {
            	            	-   (string) (len=8) "semester": (float64) 0,
            	            	-   (string) (len=4) "year": (float64) 2018
            	            	-  }
            	            	- },
            	            	- (string) (len=2) "id": (string) (len=36) "00000000-0000-0000-0000-000000000000",
            	            	- (string) (len=4) "name": (string) (len=10) "9gAmHq6MS9"
            	            	+(map[string]interface {}) (len=1) {
            	            	+ (string) (len=7) "message": (string) (len=27) "Bad Request: argument error"
            	            	 }
            	Test:       	TestCreateProject/201

https://github.com/traPtitech/traPortfolio/actions/runs/5700158665/job/15449742238

Start with integration_tests/handler/project_test.go around line 202 and integration_tests/testutils/assert.go, then run TestCreateProject repeatedly to reproduce the intermittent 400 response. Compare the 201 and 201_with_kanji cases with the linked CI failure; done means both cases consistently return 201 with the expected project response.