fix: default migration authoring directory to cwd

cmd/corestack-goose/main_test.go

@@ -41,11 +41,36 @@ func TestGeneratedConsumerAndArtifactBoundary(t *testing.T) {
 	if runtime.GOOS == "windows" {
 		osName = "linux"
 	}
-	for _, tc := range []struct{ name, kind string }{{"initial", "sql"}, {"test", "go"}, {"create_test", "go"}, {osName, "go"}} {
-		execute(dir, tool, "create", "--dir", migrations, tc.name, tc.kind)
-		execute(dir, tool, "fix", "--dir", migrations)
+	for i, tc := range []struct{ name, kind string }{{"initial", "sql"}, {"test", "go"}, {"create_test", "go"}, {osName, "go"}} {
+		if i%2 == 0 {
+			execute(migrations, tool, "create", tc.name, tc.kind)
+			execute(migrations, tool, "fix")
+		} else {
+			execute(dir, tool, "create", "--dir", migrations, tc.name, tc.kind)
+			execute(dir, tool, "fix", "--dir", migrations)
+		}
 	}
 	execute(dir, tool, "fix", "--dir", migrations)
+	entries, err := os.ReadDir(migrations)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wantFiles := []string{"00001_initial.sql", "00002_test_migration.go", "00003_create_test_migration.go", "00004_" + osName + "_migration.go", "register.go"}
+	if len(entries) != len(wantFiles) {
+		t.Fatalf("migration files: %v", entries)
+	}
+	for i, entry := range entries {
+		if entry.Name() != wantFiles[i] {
+			t.Fatalf("migration file: got %s, want %s", entry.Name(), wantFiles[i])
+		}
+	}
+	entries, err = os.ReadDir(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(entries) != 2 || entries[0].Name() != "corestack-goose" || entries[1].Name() != "migrations" {
+		t.Fatalf("unexpected writes outside migration directory: %v", entries)
+	}
 	source, err := os.ReadFile("testdata/consumer/main.go")
 	if err != nil {
 		t.Fatal(err)