From 80ab9c0bd2f741e20526920ed94d06105e672d07 Mon Sep 17 00:00:00 2001 From: Marc Alvarez Date: Thu, 22 Oct 2026 00:24:51 -0600 Subject: [PATCH] Make runnable examples drop the databases they create Examples have no *testing.T, so the runnable ones used a zero testing.T. Its Cleanup accepts functions and never runs them, so every database an example created through Setup or New stayed on the server: twelve per go test run, over two hundred on a developer's machine. exampleT, a small stand-in embedding testing.TB, implements what the library calls and runs the registered cleanups when the example is done, in reverse order as testing does. Cleanup failures print to stdout, so they break the example's expected output and fail it visibly. Compile-only examples keep their zero T; they never execute. --- example_helpers_test.go | 34 ++++++ example_test.go | 10 +- go.work.sum | 200 ++++++++++++++++++++++++++++++- postgres/example_helpers_test.go | 42 +++++++ postgres/example_test.go | 35 ++++-- 5 files changed, 301 insertions(+), 20 deletions(-) create mode 100644 example_helpers_test.go create mode 100644 postgres/example_helpers_test.go diff --git a/example_helpers_test.go b/example_helpers_test.go new file mode 100644 index 0000000..0aeecd1 --- /dev/null +++ b/example_helpers_test.go @@ -0,0 +1,34 @@ +package testdb_test + +import ( + "context" + "fmt" + "testing" +) + +// exampleT stands in for the *testing.T a runnable example does not have; +// see postgres/example_helpers_test.go for the full story. The examples +// here close their databases by hand, but a real stand-in keeps them honest +// about what they call on t. +type exampleT struct { + testing.TB + cleanups []func() +} + +func newExampleT() *exampleT { return &exampleT{} } + +func (t *exampleT) Helper() {} +func (t *exampleT) Cleanup(f func()) { t.cleanups = append(t.cleanups, f) } +func (t *exampleT) Context() context.Context { return context.Background() } +func (t *exampleT) Failed() bool { return false } +func (t *exampleT) Logf(string, ...any) {} + +func (t *exampleT) Errorf(format string, args ...any) { fmt.Printf("error: "+format+"\n", args...) } +func (t *exampleT) Fatalf(format string, args ...any) { panic(fmt.Sprintf(format, args...)) } +func (t *exampleT) Fatal(args ...any) { panic(fmt.Sprint(args...)) } + +func (t *exampleT) done() { + for i := len(t.cleanups) - 1; i >= 0; i-- { + t.cleanups[i]() + } +} diff --git a/example_test.go b/example_test.go index e2a328a..e7b0dbe 100644 --- a/example_test.go +++ b/example_test.go @@ -3,7 +3,6 @@ package testdb_test import ( "context" "fmt" - "testing" "github.com/bashhack/testdb" "github.com/bashhack/testdb/postgres" @@ -12,7 +11,8 @@ import ( // Example_new demonstrates using testdb.New with a custom initializer // for full control over database initialization. func Example_new() { - t := &testing.T{} + t := newExampleT() + defer t.done() provider := &postgres.PostgresProvider{} initializer := &postgres.PoolInitializer{} @@ -48,7 +48,8 @@ func Example_new() { // Example_dsnOnly demonstrates using testdb to get just a DSN // without automatic connection initialization. func Example_dsnOnly() { - t := &testing.T{} + t := newExampleT() + defer t.done() provider := &postgres.PostgresProvider{} @@ -78,7 +79,8 @@ func Example_dsnOnly() { // Example_customInitializer shows implementing a custom initializer // for integration with ORMs or custom database types. func Example_customInitializer() { - t := &testing.T{} + t := newExampleT() + defer t.done() provider := &postgres.PostgresProvider{} initializer := &exampleInitializer{} diff --git a/go.work.sum b/go.work.sum index 43105c9..275cf34 100644 --- a/go.work.sum +++ b/go.work.sum @@ -1,32 +1,224 @@ -filippo.io/edwards25519 v1.2.0 h1:crnVqOiS4jqYleHd9vaKZ+HKtHfllngJIiOpNpoJsjo= -filippo.io/edwards25519 v1.2.0/go.mod h1:xzAOLCNug/yB62zG1bQ8uziwrIqIuxhctzJT18Q77mc= +cel.dev/expr v0.25.2/go.mod h1:hrXvqGP6G6gyx8UAHSHJ5RGk//1Oj5nXQ2NI02Nrsg4= +cloud.google.com/go v0.123.0/go.mod h1:xBoMV08QcqUGuPW65Qfm1o9Y4zKZBpGS+7bImXLTAZU= +cloud.google.com/go/auth v0.20.0/go.mod h1:942/yi/itH1SsmpyrbnTMDgGfdy2BUqIKyd0cyYLc5Q= +cloud.google.com/go/auth/oauth2adapt v0.2.8/go.mod h1:XQ9y31RkqZCcwJWNSx2Xvric3RrU88hAYYbjDWYDL+c= +cloud.google.com/go/compute/metadata v0.9.0/go.mod h1:E0bWwX5wTnLPedCKqk3pJmVgCBSM6qQI1yTBdEb3C10= +cloud.google.com/go/iam v1.11.0/go.mod h1:KP+nKGugNJW4LcLx1uEZcq1ok5sQHFaQehQNl4QDgV4= +cloud.google.com/go/longrunning v1.1.0/go.mod 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b/postgres/example_helpers_test.go new file mode 100644 index 0000000..c330a88 --- /dev/null +++ b/postgres/example_helpers_test.go @@ -0,0 +1,42 @@ +package postgres_test + +import ( + "context" + "fmt" + "testing" +) + +// exampleT stands in for the *testing.T a runnable example does not have. +// A zero testing.T would accept t.Cleanup and never run it, so every +// database an example created stayed on the server; exampleT runs the +// cleanups when the example is done. It implements only what the library +// calls; anything else falls through to the nil embedded TB and panics, +// which is the right outcome for an example that strays outside that set. +type exampleT struct { + testing.TB + cleanups []func() +} + +func newExampleT() *exampleT { return &exampleT{} } + +func (t *exampleT) Helper() {} +func (t *exampleT) Cleanup(f func()) { t.cleanups = append(t.cleanups, f) } +func (t *exampleT) Context() context.Context { return context.Background() } +func (t *exampleT) Failed() bool { return false } + +// Logf drops the library's verbose logging, which is not part of an +// example's output. +func (t *exampleT) Logf(string, ...any) {} + +// Errorf and Fatalf surface failures: printing to stdout breaks the +// example's expected output, so the example fails visibly. +func (t *exampleT) Errorf(format string, args ...any) { fmt.Printf("error: "+format+"\n", args...) } +func (t *exampleT) Fatalf(format string, args ...any) { panic(fmt.Sprintf(format, args...)) } +func (t *exampleT) Fatal(args ...any) { panic(fmt.Sprint(args...)) } + +// done runs the cleanups in reverse order, as testing does for a real T. +func (t *exampleT) done() { + for i := len(t.cleanups) - 1; i >= 0; i-- { + t.cleanups[i]() + } +} diff --git a/postgres/example_test.go b/postgres/example_test.go index 10b8936..e746200 100644 --- a/postgres/example_test.go +++ b/postgres/example_test.go @@ -17,7 +17,8 @@ import ( // Example_setup demonstrates basic usage of postgres.Setup for creating // isolated test databases with automatic cleanup. func Example_setup() { - t := &testing.T{} + t := newExampleT() + defer t.done() // Create isolated test database with the schema applied // Cleanup is automatic via t.Cleanup() @@ -79,7 +80,8 @@ func Example_parallel() { // Example_configuration demonstrates configuration options. func Example_configuration() { - t := &testing.T{} + t := newExampleT() + defer t.done() pool := postgres.Setup(t, testdb.WithMigrator(postgres.SQLFiles("../testdata/postgres/schema")), @@ -102,7 +104,7 @@ func Example_configuration() { // Example_helperFunction demonstrates the helper function pattern for // consistent test setup. func Example_helperFunction() { - setupDB := func(t *testing.T) *pgxpool.Pool { + setupDB := func(t testing.TB) *pgxpool.Pool { t.Helper() return postgres.Setup(t, testdb.WithMigrator(postgres.SQLFiles("../testdata/postgres/schema")), @@ -110,7 +112,8 @@ func Example_helperFunction() { ) } - t := &testing.T{} + t := newExampleT() + defer t.done() pool := setupDB(t) if err := pool.Ping(context.Background()); err != nil { @@ -133,7 +136,8 @@ func (g *GormExampleInitializer) InitializeTestDatabase(ctx context.Context, dsn // Example_gorm demonstrates using postgres.New() with GORM for custom database initialization. func Example_gorm() { - t := &testing.T{} + t := newExampleT() + defer t.done() // Create test database with GORM initializer // postgres.New() is used instead of postgres.Setup() when you need custom initialization @@ -179,7 +183,8 @@ func Example_gorm() { // Example_setupVsNew demonstrates when to use Setup() vs New(). func Example_setupVsNew() { - t := &testing.T{} + t := newExampleT() + defer t.done() // Use Setup() when working with pgx/pgxpool directly // Returns *pgxpool.Pool - simplest API @@ -222,7 +227,8 @@ func Example_setupVsNew() { // // For PostgreSQL-specific features, use PoolInitializer or Setup() instead. func Example_sqlDB() { - t := &testing.T{} + t := newExampleT() + defer t.done() // Create test database with sql.DB db := postgres.New(t, &postgres.SqlDbInitializer{}) @@ -276,7 +282,8 @@ func Example_sqlDB() { // Example_basicUsage demonstrates creating an isolated test database. func Example_basicUsage() { - t := &testing.T{} + t := newExampleT() + defer t.done() // Create isolated test database pool := postgres.Setup(t) @@ -298,7 +305,8 @@ func Example_basicUsage() { // Example_customPrefix demonstrates using a custom database name prefix. func Example_customPrefix() { - t := &testing.T{} + t := newExampleT() + defer t.done() pool := postgres.Setup(t, testdb.WithDBPrefix("myapp"), @@ -328,7 +336,8 @@ func Example_customPrefix() { // Example_multipleOptions demonstrates combining multiple configuration options. func Example_multipleOptions() { - t := &testing.T{} + t := newExampleT() + defer t.done() pool := postgres.Setup(t, testdb.WithDBPrefix("test"), @@ -376,7 +385,8 @@ func Example_multipleOptions() { // database, no migration tool required. For goose, tern or golang-migrate, // use the adapter modules under github.com/bashhack/testdb/migrate. func Example_sqlFiles() { - t := &testing.T{} + t := newExampleT() + defer t.done() pool := postgres.Setup(t, testdb.WithMigrator(postgres.SQLFiles("../testdata/postgres/schema")), @@ -420,7 +430,8 @@ func Example_sqlFiles() { // Example_customMigrator shows that any function taking a context and a DSN // can prepare the database: here, a few statements run directly. func Example_customMigrator() { - t := &testing.T{} + t := newExampleT() + defer t.done() createSchema := func(ctx context.Context, dsn string) error { conn, err := pgxpool.New(ctx, dsn)