fix: exclude Go test files from migrations (#474)

README.md

@@ -338,6 +338,9 @@ func Down(tx *sql.Tx) error {
 }
 ```
 
+Note that Go migration files must begin with a numeric value, followed by an
+underscore, and must not end with `*_test.go`.
+
 # Development
 
 This can be used to build local `goose` binaries without having the latest Go version installed locally.

migrate.go

@@ -9,6 +9,7 @@ import (
 	"path"
 	"runtime"
 	"sort"
+	"strings"
 	"time"
 )
 
@@ -234,6 +235,10 @@ func collectMigrationsFS(fsys fs.FS, dirpath string, current, target int64) (Mig
 			continue // Skip any files that don't have version prefix.
 		}
 
+		if strings.HasSuffix(file, "_test.go") {
+			continue // Skip Go test files.
+		}
+
 		// Skip migrations already existing migrations registered via goose.AddMigration().
 		if _, ok := registeredGoMigrations[v]; ok {
 			continue