test: initial unit testing

internal/assert/assert.go

@@ -0,0 +1,11 @@
+package assert
+
+import "testing"
+
+func Equal[T comparable](t *testing.T, actual, expected T) {
+	t.Helper()
+
+	if actual != expected {
+		t.Errorf("got: %v; want: %v", actual, expected)
+	}
+}

internal/templates.go

@@ -23,7 +23,10 @@ type templateData struct {
 }
 
 func humanDate(t time.Time) string {
-	return t.Format("02 Jan 2006 at 15:04")
+	if t.IsZero() {
+		return ""
+	}
+	return t.UTC().Format("02 Jan 2006 at 15:04")
 }
 
 var functions = template.FuncMap{

internal/templates_test.go

@@ -0,0 +1,39 @@
+package internal
+
+import (
+	"testing"
+	"time"
+
+	"github.com/akyrey/snippetbox/internal/assert"
+)
+
+func TestHumanDate(t *testing.T) {
+	tests := []struct {
+		name string
+		tm   time.Time
+		want string
+	}{
+		{
+			name: "UTC",
+			tm:   time.Date(2024, 04, 29, 22, 9, 0, 0, time.UTC),
+			want: "29 Apr 2024 at 22:09",
+		},
+		{
+			name: "Empty",
+			tm:   time.Time{},
+			want: "",
+		},
+		{
+			name: "CET",
+			tm:   time.Date(2024, 04, 29, 22, 9, 0, 0, time.FixedZone("CET", 1*60*60)),
+			want: "29 Apr 2024 at 21:09",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := humanDate(tt.tm)
+			assert.Equal(t, got, tt.want)
+		})
+	}
+}