Added a few more tests

Signed-off-by: Italo Vietro <italo.vietro@n26.com>

outbox_message_test.go

@@ -0,0 +1,66 @@
+package outboxer
+
+import (
+	"testing"
+)
+
+func TestOutboxMessage(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		scenario string
+		function func(*testing.T)
+	}{
+		{
+			"check if NullTime Scan works for message",
+			testNullTimeScan,
+		},
+		{
+			"check if NullTime Value works for message",
+			testNullTimeValue,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.scenario, func(t *testing.T) {
+			test.function(t)
+		})
+	}
+}
+
+func testNullTimeScan(t *testing.T) {
+	nt := NullTime{}
+	if err := nt.Scan("03/05/2019"); err != nil {
+		t.Fatalf("failed to scan NullTime value: %s", err)
+	}
+
+	if err := nt.Scan(nil); err != nil {
+		t.Fatalf("failed to scan NullTime with nil value: %s", err)
+	}
+
+	if err := nt.Scan("wrongValue"); err != nil {
+		t.Fatalf("an error was not expected when scannig a NullTime value: %s", err)
+	}
+}
+
+func testNullTimeValue(t *testing.T) {
+	nt := NullTime{Valid: true}
+	if err := nt.Scan("2019-02-01 16:42:35.571831"); err != nil {
+		t.Fatalf("failed to scan NullTime value: %s", err)
+	}
+
+	v, err := nt.Value()
+	if err != nil {
+		t.Fatalf("failed to get driver.Value from NullTime: %s", err)
+	}
+
+	if v != nil {
+		t.Fatalf("driver.Value was expected from NullTime: %s", err)
+	}
+
+	nt.Valid = false
+	v, _ = nt.Value()
+	if v != nil {
+		t.Fatalf("driver.Value is not supposed to be nil: %s", err)
+	}
+}