diff --git a/.gitignore b/.gitignore
index adf6091..77da274 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .vscode
 cmd/pgtalk-gen/pgtalk-gen
 test/gen.sh
+coverage.out
diff --git a/convert/convert_test.go b/convert/convert_test.go
index ae7f4e0..3ea3320 100644
--- a/convert/convert_test.go
+++ b/convert/convert_test.go
@@ -2,10 +2,51 @@ package convert
 
 import (
 	"testing"
+	"time"
 
+	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5/pgtype"
 )
 
+func TestStringToUUID(t *testing.T) {
+	s := "123e4567-e89b-12d3-a456-426614174000"
+	u := StringToUUID(s)
+	if !u.Valid {
+		t.Fatal("valid uuid expected")
+	}
+	if got, want := u.Bytes, [16]byte{0x12, 0x3e, 0x45, 0x67, 0xe8, 0x9b, 0x12, 0xd3, 0xa4, 0x56, 0x42, 0x66, 0x14, 0x17, 0x40, 0x00}; got != want {
+		t.Errorf("got %v want %v", got, want)
+	}
+	if want := StringToUUID("123"); want.Valid {
+		t.Error("invalid uuid expected")
+	}
+	if want := StringToUUID("123e4567-e89b-12d3-a456-42661417400"); want.Valid {
+		t.Error("invalid uuid expected")
+	}
+	s = "123e4567e89b12d3a456426614174000"
+	u = StringToUUID(s)
+	if !u.Valid {
+		t.Fatal("valid uuid expected")
+	}
+}
+
+func TestParseUUID(t *testing.T) {
+	if _, err := parseUUID("123"); err == nil {
+		t.Error("error expected")
+	}
+	if _, err := parseUUID("123e4567-e89b-12d3-a456-42661417400k"); err == nil {
+		t.Error("error expected")
+	}
+}
+
+func TestUUID(t *testing.T) {
+	u := uuid.New()
+	pu := UUID(u)
+	if !pu.Valid {
+		t.Error("valid pgtype.UUID expected")
+	}
+}
+
 func TestUUIDToString(t *testing.T) {
 	i := pgtype.UUID{
 		Bytes: [16]byte{1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4},
@@ -20,6 +61,67 @@ func TestUUIDToString(t *testing.T) {
 	}
 }
 
+func TestTime(t *testing.T) {
+	now := time.Now()
+	if got, want := TimeToTimestamptz(now).Time, now; !got.Equal(want) {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := TimeToTimestamp(now).Time, now.UTC(); !got.Equal(want) {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := TimeToDate(now).Time, now; !got.Equal(want) {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := TimeToTime(now).Microseconds, now.UnixMicro(); got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+}
+
+func TestInts(t *testing.T) {
+	if got, want := Int16ToInt2(1).Int16, int16(1); got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := Int64ToInt8(1).Int64, int64(1); got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := Int4ToInt8(pgtype.Int4{Int32: 1, Valid: true}).Int64, int64(1); got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := Int32ToInt4(1).Int32, int32(1); got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := Int8(1).Int64, int64(1); got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := Int4(1).Int32, int32(1); got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+}
+
+func TestOthers(t *testing.T) {
+	if got, want := StringToText("a").String, "a"; got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := Bool(true).Bool, true; got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	d := pgtype.Date{Time: time.Now(), Valid: true}
+	if got := DateToTimePtr(d); got == nil {
+		t.Error("got nil want time.Time")
+	}
+	d.Valid = false
+	if got := DateToTimePtr(d); got != nil {
+		t.Error("got time.Time want nil")
+	}
+	if got, want := Float64ToFloat8(1.0).Float64, 1.0; got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	sa := StringsToTextArray([]string{"a", "b"})
+	if got, want := len(sa), 2; got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+}
+
 func TestTextArrayToStrings(t *testing.T) {
 	a := pgtype.FlatArray[pgtype.Text]{}
 	a = append(a, pgtype.Text{String: "a", Valid: true})
diff --git a/coverage.out b/coverage.out
new file mode 100644
index 0000000..fabe9df
--- /dev/null
+++ b/coverage.out
@@ -0,0 +1,37 @@
+mode: set
+github.com/emicklei/pgtalk/convert/convert.go:12.36,17.2 1 0
+github.com/emicklei/pgtalk/convert/convert.go:21.41,23.16 2 0
+github.com/emicklei/pgtalk/convert/convert.go:23.16,28.3 1 0
+github.com/emicklei/pgtalk/convert/convert.go:29.2,32.3 1 0
+github.com/emicklei/pgtalk/convert/convert.go:36.54,37.18 1 0
+github.com/emicklei/pgtalk/convert/convert.go:38.10,39.66 1 0
+github.com/emicklei/pgtalk/convert/convert.go:40.10,40.10 0 0
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+github.com/emicklei/pgtalk/convert/convert.go:48.16,50.3 1 0
+github.com/emicklei/pgtalk/convert/convert.go:52.2,53.17 2 0
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+github.com/emicklei/pgtalk/convert/convert.go:97.39,99.2 1 0
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+github.com/emicklei/pgtalk/convert/convert.go:134.28,136.3 1 0
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+github.com/emicklei/pgtalk/convert/convert.go:140.71,142.29 2 1
+github.com/emicklei/pgtalk/convert/convert.go:142.29,144.3 1 1
+github.com/emicklei/pgtalk/convert/convert.go:145.2,145.13 1 1