diff --git a/Makefile b/Makefile
index 823c348..6de0199 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ psql:
 
 .PHONY: test
 test:
-	go test ./...
+	go run ./internal/pgdocker/cmd/pgdocker -- go test ./...
 
 .PHONY: acceptance-test
 acceptance-test:
diff --git a/internal/pgdocker/cmd/pgdocker/main.go b/internal/pgdocker/cmd/pgdocker/main.go
new file mode 100644
index 0000000..765acec
--- /dev/null
+++ b/internal/pgdocker/cmd/pgdocker/main.go
@@ -0,0 +1,59 @@
+// pgdocker starts a Postgres Docker container and exposes it to a wrapped
+// command through the PGURL environment variable.
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"time"
+
+	"github.com/jschaf/pggen/internal/errs"
+	"github.com/jschaf/pggen/internal/pgdocker"
+)
+
+func main() {
+	if err := run(); err != nil {
+		var exitErr *exec.ExitError
+		if errors.As(err, &exitErr) {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(exitErr.ExitCode())
+		}
+		log.Fatal(err)
+	}
+}
+
+func run() (mErr error) {
+	if len(os.Args) < 3 || os.Args[1] != "--" {
+		return fmt.Errorf("usage: %s -- <command> [args...]", os.Args[0])
+	}
+
+	ctx := context.Background()
+	docker, err := pgdocker.Start(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("start postgres: %w", err)
+	}
+	defer errs.Capture(&mErr, func() error {
+		stopCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+		return docker.Stop(stopCtx)
+	}, "stop postgres")
+
+	connStr, err := docker.ConnString()
+	if err != nil {
+		return fmt.Errorf("postgres connection string: %w", err)
+	}
+
+	wrapped := exec.Command(os.Args[2], os.Args[3:]...) //nolint:gosec // Runs the command explicitly supplied after --.
+	wrapped.Stdin = os.Stdin
+	wrapped.Stdout = os.Stdout
+	wrapped.Stderr = os.Stderr
+	wrapped.Env = append(os.Environ(), "PGURL="+connStr)
+	if err := wrapped.Run(); err != nil {
+		return fmt.Errorf("%v: %w", wrapped.Args, err)
+	}
+	return nil
+}
diff --git a/internal/pgtest/pg_test_db.go b/internal/pgtest/pg_test_db.go
index 1ee8388..42e4172 100644
--- a/internal/pgtest/pg_test_db.go
+++ b/internal/pgtest/pg_test_db.go
@@ -3,6 +3,7 @@ package pgtest
 import (
 	"context"
 	"math/rand/v2"
+	"net/url"
 	"os"
 	"strconv"
 	"strings"
@@ -22,7 +23,7 @@ type Option func(config *pgx.ConnConfig)
 func NewPostgresSchemaString(t *testing.T, sql string, opts ...Option) (*pgx.Conn, CleanupFunc) {
 	t.Helper()
 	// Create a new schema.
-	connStr := "user=postgres password=hunter2 host=localhost port=5555 dbname=pggen"
+	connStr := postgresConnString()
 	ctx, cancel := context.WithTimeout(t.Context(), 10*time.Second)
 	defer cancel()
 	conn, err := pgx.Connect(ctx, connStr)
@@ -36,10 +37,10 @@ func NewPostgresSchemaString(t *testing.T, sql string, opts ...Option) (*pgx.Con
 	t.Logf("created schema: %s", schema)
 
 	// Load SQL files into new schema.
-	connStr += " search_path=" + schema
-	connCfg, err := pgx.ParseConfig(connStr)
+	schemaConnStr := postgresSchemaConnString(connStr, schema)
+	connCfg, err := pgx.ParseConfig(schemaConnStr)
 	if err != nil {
-		t.Fatalf("parse config: %q: %s", connStr, err)
+		t.Fatalf("parse config: %q: %s", schemaConnStr, err)
 	}
 	for _, opt := range opts {
 		opt(connCfg)
@@ -69,6 +70,23 @@ func NewPostgresSchemaString(t *testing.T, sql string, opts ...Option) (*pgx.Con
 	return schemaConn, cleanup
 }
 
+func postgresConnString() string {
+	if connStr := os.Getenv("PGURL"); connStr != "" {
+		return connStr
+	}
+	return "user=postgres password=hunter2 host=localhost port=5555 dbname=pggen"
+}
+
+func postgresSchemaConnString(connStr string, schema string) string {
+	if u, err := url.Parse(connStr); err == nil && (u.Scheme == "postgres" || u.Scheme == "postgresql") {
+		q := u.Query()
+		q.Set("search_path", schema)
+		u.RawQuery = q.Encode()
+		return u.String()
+	}
+	return connStr + " search_path=" + schema
+}
+
 // NewPostgresSchema opens a connection with search_path set to a randomly
 // named, new schema and loads all sqlFiles.
 func NewPostgresSchema(t *testing.T, sqlFiles []string, opts ...Option) (*pgx.Conn, CleanupFunc) {