refac: missing mutation tests, spa specs, checks shown to pass, touch targets, catalogue entry, production code

test/fakes_common.go

@@ -1,9 +1,16 @@
 package test
 
-import "errors"
+import (
+	"errors"
+	"sync"
+)
 
 var errRepositoryFailure = errors.New("repository failure")
 
+var errRunawayLocking = errors.New("the use case kept locking sites without settling")
+
+const runawayLockCalls = 1000
+
 type failSwitch struct {
 	method string
 	err    error
@@ -33,3 +40,15 @@ func (f *failSwitch) trigger(method string) error {
 }
 
 const migrationPublicURL = "https://www.example.com"
+
+func outsideLock(mu *sync.Mutex, hook func()) {
+	mu.Unlock()
+	defer mu.Lock()
+	hook()
+}
+
+func outsideLockErr(mu *sync.Mutex, hook func() error) error {
+	mu.Unlock()
+	defer mu.Lock()
+	return hook()
+}