temporarily disable concurrent test execution when collecting coverage report

turbolent · turbolent · commit 838d9140bd1c · 2026-04-20T11:42:07.000-07:00
diff --git a/internal/test/test.go b/internal/test/test.go
@@ -273,8 +273,12 @@ func testCode(
 	}
 
 	// Limit concurrency to flags.Jobs, defaulting to number of CPU cores.
+	// When coverage is enabled, force sequential execution because the
+	// coverage report is shared across all test file goroutines.
 	jobs := flags.Jobs
-	if jobs <= 0 {
+	if flags.Cover {
+		jobs = 1
+	} else if jobs <= 0 {
 		jobs = goRuntime.NumCPU()
 	}
 	sem := make(chan struct{}, jobs)

Original file line number	Diff line number	Diff line change
`@@ -273,8 +273,12 @@ func testCode(`
`273`	`273`	`}`
`274`	`274`
`275`	`275`	`// Limit concurrency to flags.Jobs, defaulting to number of CPU cores.`
	`276`	`+ // When coverage is enabled, force sequential execution because the`
	`277`	`+ // coverage report is shared across all test file goroutines.`
`276`	`278`	`jobs := flags.Jobs`
`277`		`- if jobs <= 0 {`
	`279`	`+ if flags.Cover {`
	`280`	`+ jobs = 1`
	`281`	`+ } else if jobs <= 0 {`
`278`	`282`	`jobs = goRuntime.NumCPU()`
`279`	`283`	`}`
`280`	`284`	`sem := make(chan struct{}, jobs)`