Validate SQLiteDate (#2052)

* Reject invalid SQLiteDate strings
* Add unit tests
* Handle null values

pkg/models/sqlite_date_test.go

@@ -0,0 +1,84 @@
+package models
+
+import (
+	"database/sql/driver"
+	"reflect"
+	"testing"
+)
+
+func TestSQLiteDate_Value(t *testing.T) {
+	tests := []struct {
+		name    string
+		tr      SQLiteDate
+		want    driver.Value
+		wantErr bool
+	}{
+		{
+			"empty string",
+			SQLiteDate{"", true},
+			"",
+			false,
+		},
+		{
+			"whitespace",
+			SQLiteDate{" ", true},
+			"",
+			false,
+		},
+		{
+			"RFC3339",
+			SQLiteDate{"2021-11-22T17:11:55+11:00", true},
+			"2021-11-22",
+			false,
+		},
+		{
+			"date",
+			SQLiteDate{"2021-11-22", true},
+			"2021-11-22",
+			false,
+		},
+		{
+			"date and time",
+			SQLiteDate{"2021-11-22 17:12:05", true},
+			"2021-11-22",
+			false,
+		},
+		{
+			"date, time and zone",
+			SQLiteDate{"2021-11-22 17:33:05 AEST", true},
+			"2021-11-22",
+			false,
+		},
+		{
+			"whitespaced date",
+			SQLiteDate{"  2021-11-22 ", true},
+			"2021-11-22",
+			false,
+		},
+		{
+			"bad format",
+			SQLiteDate{"foo", true},
+			nil,
+			true,
+		},
+		{
+			"invalid",
+			SQLiteDate{"null", false},
+			nil,
+			false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := tt.tr.Value()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("SQLiteDate.Value() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("SQLiteDate.Value() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}