api/types/container: make HealthStatus a concrete type

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

api/types/container/health.go

@@ -7,9 +7,7 @@ import (
 )
 
 // HealthStatus is a string representation of the container's health.
-//
-// It currently is an alias for string, but may become a distinct type in future.
-type HealthStatus = string
+type HealthStatus string
 
 // Health states
 const (
@@ -41,7 +39,10 @@ type HealthcheckResult struct {
 }
 
 var validHealths = []string{
-	NoHealthcheck, Starting, Healthy, Unhealthy,
+	string(NoHealthcheck),
+	string(Starting),
+	string(Healthy),
+	string(Unhealthy),
 }
 
 // ValidateHealthStatus checks if the provided string is a valid

api/types/container/health_test.go

@@ -19,7 +19,7 @@ func TestValidateHealthStatus(t *testing.T) {
 	}
 
 	for _, tc := range tests {
-		t.Run(tc.health, func(t *testing.T) {
+		t.Run(string(tc.health), func(t *testing.T) {
 			err := ValidateHealthStatus(tc.health)
 			if tc.expectedErr == "" {
 				assert.NilError(t, err)