Documentation, tests.

tests/conn_test.go

@@ -3,6 +3,7 @@ package tests
 import (
 	"context"
 	"errors"
+	"reflect"
 	"strings"
 	"testing"
 
@@ -58,6 +59,41 @@ func TestConn_Close_BUSY(t *testing.T) {
 	}
 }
 
+func TestConn_Pragma(t *testing.T) {
+	t.Parallel()
+
+	db, err := sqlite3.Open("file::memory:?_pragma=busy_timeout(1000)")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	got, err := db.Pragma("busy_timeout")
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []string{"1000"}
+
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("got %v, want %v", got, want)
+	}
+
+	var serr *sqlite3.Error
+	_, err = db.Pragma("+")
+	if err == nil {
+		t.Error("want: error")
+	}
+	if !errors.As(err, &serr) {
+		t.Fatalf("got %T, want sqlite3.Error", err)
+	}
+	if rc := serr.Code(); rc != sqlite3.ERROR {
+		t.Errorf("got %d, want sqlite3.ERROR", rc)
+	}
+	if got := err.Error(); got != `sqlite3: SQL logic error: near "+": syntax error` {
+		t.Error("got message:", got)
+	}
+}
+
 func TestConn_SetInterrupt(t *testing.T) {
 	t.Parallel()