test: add unit test for template functions

issue: #40

sv/formatter_functions_test.go

@@ -0,0 +1,45 @@
+package sv
+
+import (
+	"reflect"
+	"testing"
+	"time"
+)
+
+func Test_timeFormat(t *testing.T) {
+	tests := []struct {
+		name   string
+		time   time.Time
+		format string
+		want   string
+	}{
+		{"valid time", time.Date(2022, 1, 1, 0, 0, 0, 0, time.UTC), "2006-01-02", "2022-01-01"},
+		{"empty time", time.Time{}, "2006-01-02", ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := timeFormat(tt.time, tt.format); got != tt.want {
+				t.Errorf("timeFormat() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_getSection(t *testing.T) {
+	tests := []struct {
+		name        string
+		sections    []ReleaseNoteSection
+		sectionName string
+		want        ReleaseNoteSection
+	}{
+		{"existing section", []ReleaseNoteSection{ReleaseNoteCommitsSection{Name: "section 0"}, ReleaseNoteCommitsSection{Name: "section 1"}, ReleaseNoteCommitsSection{Name: "section 2"}}, "section 1", ReleaseNoteCommitsSection{Name: "section 1"}},
+		{"nonexisting section", []ReleaseNoteSection{ReleaseNoteCommitsSection{Name: "section 0"}, ReleaseNoteCommitsSection{Name: "section 1"}, ReleaseNoteCommitsSection{Name: "section 2"}}, "section 10", nil},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := getSection(tt.sections, tt.sectionName); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("getSection() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}