Adding upstream version 0.28.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/ghupdate/ghupdate_test.go

@@ -0,0 +1,38 @@
+package ghupdate
+
+import "testing"
+
+func TestCompareVersions(t *testing.T) {
+	scenarios := []struct {
+		a        string
+		b        string
+		expected int
+	}{
+		{"", "", 0},
+		{"0", "", 0},
+		{"1", "1.0.0", 0},
+		{"1.1", "1.1.0", 0},
+		{"1.1", "1.1.1", 1},
+		{"1.1", "1.0.1", -1},
+		{"1.0", "1.0.1", 1},
+		{"1.10", "1.9", -1},
+		{"1.2", "1.12", 1},
+		{"3.2", "1.6", -1},
+		{"0.0.2", "0.0.1", -1},
+		{"0.16.2", "0.17.0", 1},
+		{"1.15.0", "0.16.1", -1},
+		{"1.2.9", "1.2.10", 1},
+		{"3.2", "4.0", 1},
+		{"3.2.4", "3.2.3", -1},
+	}
+
+	for _, s := range scenarios {
+		t.Run(s.a+"VS"+s.b, func(t *testing.T) {
+			result := compareVersions(s.a, s.b)
+
+			if result != s.expected {
+				t.Fatalf("Expected %q vs %q to result in %d, got %d", s.a, s.b, s.expected, result)
+			}
+		})
+	}
+}