From 36ade8290ae8948a592da61fce919e36bfd43921 Mon Sep 17 00:00:00 2001
From: Drew Bednar <drew@runcible.io>
Date: Sat, 15 Feb 2025 15:42:31 -0500
Subject: [PATCH] Added assert package and added test

---
 internal/assert/assert.go         | 18 ++++++++++++
 internal/server/templates.go      |  8 ++++-
 internal/server/templates_test.go | 49 +++++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 internal/assert/assert.go
 create mode 100644 internal/server/templates_test.go

diff --git a/internal/assert/assert.go b/internal/assert/assert.go
new file mode 100644
index 0000000..1417379
--- /dev/null
+++ b/internal/assert/assert.go
@@ -0,0 +1,18 @@
+package assert
+
+import "testing"
+
+// Equal a generic function to test equivalence between two values
+// of the same type
+func Equal[T comparable](t *testing.T, actual, expected T) {
+	//The t.Helper() function that we’re using in the code above indicates
+	//  to the Go test runner that our Equal() function is a test helper.
+	// This means that when t.Errorf() is called from our Equal() function,
+	// the Go test runner will report the filename and line number of the
+	// code which called our Equal() function in the output.
+	t.Helper()
+
+	if actual != expected {
+		t.Errorf("got: %v; want %v", actual, expected)
+	}
+}
diff --git a/internal/server/templates.go b/internal/server/templates.go
index 0014d77..fd57571 100644
--- a/internal/server/templates.go
+++ b/internal/server/templates.go
@@ -48,7 +48,13 @@ func newTemplateData(r *http.Request, sm *scs.SessionManager) templateData {
 // Create a humanDate function which returns a nicely formatted string
 // representation of a time.Time object.
 func humanDate(t time.Time) string {
-	return t.Format("02 Jan 2006 at 15:04")
+	if t.IsZero() {
+		return ""
+	}
+
+	// return t.Format("02 Jan 2006 at 15:04")
+	// always return in UTC
+	return t.UTC().Format("02 Jan 2006 at 15:04")
 }
 
 // TEMPLATE FILTERS
diff --git a/internal/server/templates_test.go b/internal/server/templates_test.go
new file mode 100644
index 0000000..50e5ce7
--- /dev/null
+++ b/internal/server/templates_test.go
@@ -0,0 +1,49 @@
+package server
+
+import (
+	"testing"
+	"time"
+
+	"git.runcible.io/learning/ratchet/internal/assert"
+)
+
+func TestHumanDate(t *testing.T) {
+
+	// Table driven test
+	tests := []struct {
+		name string
+		tm   time.Time
+		want string
+	}{
+		{
+			name: "UTC",
+			tm:   time.Date(2077, time.April, 12, 23, 0, 0, 0, time.UTC),
+			want: "12 Apr 2077 at 23:00",
+		},
+		{
+			name: "UTC",
+			tm:   time.Date(2025, time.March, 3, 2, 31, 0, 0, time.UTC),
+			want: "03 Mar 2025 at 02:31",
+		},
+		{
+			name: "Empty",
+			tm:   time.Time{},
+			want: "",
+		},
+		// CET is one hour ahead of UTC but we print in UTC
+		{
+			name: "CET",
+			tm:   time.Date(2024, 3, 17, 10, 15, 0, 0, time.FixedZone("CET", 1*60*60)),
+			want: "17 Mar 2024 at 09:15",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			got := humanDate(test.tm)
+
+			assert.Equal(t, got, test.want)
+		})
+	}
+
+}