sqlite3_test.go: Fix go test -run=...: Use standard sub-tests (#881)

Selecting only some tests with go test -run=... does not work, because
some of the tests are executed using testing.RunTests(). That function
is documented as "an internal function". This changes TestSuite to use
the testing subtests feature instead.

This has a behaviour change: the benchmarks now need to be
selected at the command line with the standard go test -bench=.
flag. This will also set up the test database twice when running
benchmarks, rather than once.

sqlite3_test.go

@@ -27,7 +27,7 @@ import (
 	"time"
 )
 
-func TempFilename(t *testing.T) string {
+func TempFilename(t testing.TB) string {
 	f, err := ioutil.TempFile("", "go-sqlite3-test-")
 	if err != nil {
 		t.Fatal(err)
@@ -1888,28 +1888,21 @@ func BenchmarkCustomFunctions(b *testing.B) {
 }
 
 func TestSuite(t *testing.T) {
-	tempFilename := TempFilename(t)
-	defer os.Remove(tempFilename)
-	d, err := sql.Open("sqlite3", tempFilename+"?_busy_timeout=99999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer d.Close()
+	initializeTestDB(t)
+	defer freeTestDB()
 
-	db = &TestDB{t, d, SQLITE, sync.Once{}}
-	ok := testing.RunTests(func(string, string) (bool, error) { return true, nil }, tests)
-	if !ok {
-		t.Fatal("A subtest failed")
+	for _, test := range tests {
+		t.Run(test.Name, test.F)
 	}
+}
 
-	if !testing.Short() {
-		for _, b := range benchmarks {
-			fmt.Printf("%-20s", b.Name)
-			r := testing.Benchmark(b.F)
-			fmt.Printf("%10d %10.0f req/s\n", r.N, float64(r.N)/r.T.Seconds())
-		}
+func BenchmarkSuite(b *testing.B) {
+	initializeTestDB(b)
+	defer freeTestDB()
+
+	for _, benchmark := range benchmarks {
+		b.Run(benchmark.Name, benchmark.F)
 	}
-	db.tearDown()
 }
 
 // Dialect is a type of dialect of databases.
@@ -1924,14 +1917,37 @@ const (
 
 // DB provide context for the tests
 type TestDB struct {
-	*testing.T
+	testing.TB
 	*sql.DB
-	dialect Dialect
-	once    sync.Once
+	dialect      Dialect
+	once         sync.Once
+	tempFilename string
 }
 
 var db *TestDB
 
+func initializeTestDB(t testing.TB) {
+	tempFilename := TempFilename(t)
+	d, err := sql.Open("sqlite3", tempFilename+"?_busy_timeout=99999")
+	if err != nil {
+		os.Remove(tempFilename)
+		t.Fatal(err)
+	}
+
+	db = &TestDB{t, d, SQLITE, sync.Once{}, tempFilename}
+}
+
+func freeTestDB() {
+	err := db.DB.Close()
+	if err != nil {
+		panic(err)
+	}
+	err = os.Remove(db.tempFilename)
+	if err != nil {
+		panic(err)
+	}
+}
+
 // the following tables will be created and dropped during the test
 var testTables = []string{"foo", "bar", "t", "bench"}