Add Int4 test

pgtype/int4_test.go

@@ -0,0 +1,87 @@
+package pgtype_test
+
+import (
+	"bytes"
+	"math"
+	"testing"
+
+	"github.com/jackc/pgx"
+	"github.com/jackc/pgx/pgio"
+	"github.com/jackc/pgx/pgtype"
+)
+
+func TestInt4Transcode(t *testing.T) {
+	conn := mustConnectPgx(t)
+	defer mustClose(t, conn)
+
+	ps, err := conn.Prepare("test", "select $1::int4")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tests := []struct {
+		result pgtype.Int4
+	}{
+		{result: pgtype.Int4(math.MinInt32)},
+		{result: pgtype.Int4(-1)},
+		{result: pgtype.Int4(0)},
+		{result: pgtype.Int4(1)},
+		{result: pgtype.Int4(math.MaxInt32)},
+	}
+
+	ps.FieldDescriptions[0].FormatCode = pgx.TextFormatCode
+	for i, tt := range tests {
+		inputBuf := &bytes.Buffer{}
+		err = tt.result.EncodeText(inputBuf)
+		if err != nil {
+			t.Errorf("TextFormat %d: %v", i, err)
+		}
+
+		var s string
+		err := conn.QueryRow("test", string(inputBuf.Bytes()[4:])).Scan(&s)
+		if err != nil {
+			t.Errorf("TextFormat %d: %v", i, err)
+		}
+
+		outputBuf := &bytes.Buffer{}
+		pgio.WriteInt32(outputBuf, int32(len(s)))
+		outputBuf.WriteString(s)
+		var r pgtype.Int4
+		err = r.DecodeText(outputBuf)
+		if err != nil {
+			t.Errorf("TextFormat %d: %v", i, err)
+		}
+
+		if r != tt.result {
+			t.Errorf("TextFormat %d: expected %v, got %v", i, tt.result, r)
+		}
+	}
+
+	ps.FieldDescriptions[0].FormatCode = pgx.BinaryFormatCode
+	for i, tt := range tests {
+		inputBuf := &bytes.Buffer{}
+		err = tt.result.EncodeBinary(inputBuf)
+		if err != nil {
+			t.Errorf("BinaryFormat %d: %v", i, err)
+		}
+
+		var buf []byte
+		err := conn.QueryRow("test", inputBuf.Bytes()[4:]).Scan(&buf)
+		if err != nil {
+			t.Errorf("BinaryFormat %d: %v", i, err)
+		}
+
+		outputBuf := &bytes.Buffer{}
+		pgio.WriteInt32(outputBuf, int32(len(buf)))
+		outputBuf.Write(buf)
+		var r pgtype.Int4
+		err = r.DecodeBinary(outputBuf)
+		if err != nil {
+			t.Errorf("BinaryFormat %d: %v", i, err)
+		}
+
+		if r != tt.result {
+			t.Errorf("BinaryFormat %d: expected %v, got %v", i, tt.result, r)
+		}
+	}
+}