feat(spantest): support multiple schema globs

When combining schemas from multiple sources.

spantest/emulator.go

@@ -114,10 +114,14 @@ func (fx *EmulatorFixture) Context() context.Context {
 }
 
 // NewDatabaseFromDDLFiles creates a new database with a random ID from the provided DDL file path glob.
-func (fx *EmulatorFixture) NewDatabaseFromDDLFiles(t *testing.T, glob string) *spanner.Client {
+func (fx *EmulatorFixture) NewDatabaseFromDDLFiles(t *testing.T, globs ...string) *spanner.Client {
 	t.Helper()
-	files, err := filepath.Glob(glob)
-	assert.NilError(t, err)
+	var files []string
+	for _, glob := range globs {
+		globFiles, err := filepath.Glob(glob)
+		assert.NilError(t, err)
+		files = append(files, globFiles...)
+	}
 	var statements []string
 	for _, file := range files {
 		content, err := ioutil.ReadFile(file)

spantest/fixture.go

@@ -9,7 +9,7 @@ import (
 // Fixture is a Spanner test fixture.
 type Fixture interface {
 	// NewDatabaseFromDLLFiles creates a new database and applies the DDL files from the provided glob.
-	NewDatabaseFromDDLFiles(t *testing.T, glob string) *spanner.Client
+	NewDatabaseFromDDLFiles(t *testing.T, globs ...string) *spanner.Client
 	// NewDatabaseFromStatements creates a new database and applies the provided DLL statements.
 	NewDatabaseFromStatements(t *testing.T, statements []string) *spanner.Client
 }

spantest/inmemory.go

@@ -35,10 +35,14 @@ func NewInMemoryFixture(t *testing.T) Fixture {
 }
 
 // NewDatabaseFromDDLFiles implements Fixture.
-func (fx *InMemoryFixture) NewDatabaseFromDDLFiles(t *testing.T, glob string) *spanner.Client {
+func (fx *InMemoryFixture) NewDatabaseFromDDLFiles(t *testing.T, globs ...string) *spanner.Client {
 	t.Helper()
-	files, err := filepath.Glob(glob)
-	assert.NilError(t, err)
+	var files []string
+	for _, glob := range globs {
+		globFiles, err := filepath.Glob(glob)
+		assert.NilError(t, err)
+		files = append(files, globFiles...)
+	}
 	var statements []string
 	for _, file := range files {
 		content, err := ioutil.ReadFile(file)