Refactor.

stmt_test.go

@@ -0,0 +1,60 @@
+package sqlite3
+
+import (
+	"testing"
+)
+
+func Test_emptyStatement(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name string
+		stmt string
+		want bool
+	}{
+		{"empty", "", true},
+		{"space", " ", true},
+		{"separator", ";\n ", true},
+		{"begin", "BEGIN", false},
+		{"select", "SELECT 1;", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := emptyStatement(tt.stmt); got != tt.want {
+				t.Errorf("got %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Fuzz_emptyStatement(f *testing.F) {
+	f.Add("")
+	f.Add(" ")
+	f.Add(";\n ")
+	f.Add("; ;\v")
+	f.Add("BEGIN")
+	f.Add("SELECT 1;")
+
+	db, err := Open(":memory:")
+	if err != nil {
+		f.Fatal(err)
+	}
+	defer db.Close()
+
+	f.Fuzz(func(t *testing.T, sql string) {
+		// If empty, SQLite parses it as empty.
+		if emptyStatement(sql) {
+			stmt, tail, err := db.Prepare(sql)
+			if err != nil {
+				t.Errorf("%q, %v", sql, err)
+			}
+			if stmt != nil {
+				t.Errorf("%q, %v", sql, stmt)
+			}
+			if tail != "" {
+				t.Errorf("%q", sql)
+			}
+			stmt.Close()
+		}
+	})
+}