Strengthen assertions for adding CHECKs

Ensure that a constraint with the expected name is present on the table.

pkg/migrations/op_set_check_test.go

@@ -56,6 +56,9 @@ func TestSetCheckConstraint(t *testing.T) {
 				// The new (temporary) `title` column should exist on the underlying table.
 				ColumnMustExist(t, db, "public", "posts", migrations.TemporaryName("title"))
 
+				// A check constraint has been added to the temporary column
+				ConstraintMustExist(t, db, "public", "posts", "check_title_length")
+
 				// Inserting a row that meets the check constraint into the old view works.
 				MustInsert(t, db, "public", "01_add_table", "posts", map[string]string{
 					"title": "post by alice",
@@ -96,6 +99,9 @@ func TestSetCheckConstraint(t *testing.T) {
 				// The new (temporary) `title` column should not exist on the underlying table.
 				ColumnMustNotExist(t, db, "public", "posts", migrations.TemporaryName("title"))
 
+				// The check constraint no longer exists.
+				ConstraintMustNotExist(t, db, "public", "posts", "check_title_length")
+
 				// The up function no longer exists.
 				FunctionMustNotExist(t, db, "public", migrations.TriggerFunctionName("posts", "title"))
 				// The down function no longer exists.
@@ -107,6 +113,9 @@ func TestSetCheckConstraint(t *testing.T) {
 				TriggerMustNotExist(t, db, "public", "posts", migrations.TriggerName("posts", migrations.TemporaryName("title")))
 			},
 			afterComplete: func(t *testing.T, db *sql.DB) {
+				// The check constraint exists on the new table.
+				ConstraintMustExist(t, db, "public", "posts", "check_title_length")
+
 				// Inserting a row that meets the check constraint into the new view works.
 				MustInsert(t, db, "public", "02_add_check_constraint", "posts", map[string]string{
 					"title": "post by dana",