Refactor out upgrade package

upgrade/upgrade_test.go

@@ -0,0 +1,39 @@
+// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
+// All rights reserved. Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package upgrade
+
+import "testing"
+
+var testcases = []struct {
+	a, b string
+	r    int
+}{
+	{"0.1.2", "0.1.2", 0},
+	{"0.1.3", "0.1.2", 1},
+	{"0.1.1", "0.1.2", -1},
+	{"0.3.0", "0.1.2", 1},
+	{"0.0.9", "0.1.2", -1},
+	{"1.1.2", "0.1.2", 1},
+	{"0.1.2", "1.1.2", -1},
+	{"0.1.10", "0.1.9", 1},
+	{"0.10.0", "0.2.0", 1},
+	{"30.10.0", "4.9.0", 1},
+	{"0.9.0-beta7", "0.9.0-beta6", 1},
+	{"1.0.0-alpha", "1.0.0-alpha.1", -1},
+	{"1.0.0-alpha.1", "1.0.0-alpha.beta", -1},
+	{"1.0.0-alpha.beta", "1.0.0-beta", -1},
+	{"1.0.0-beta", "1.0.0-beta.2", -1},
+	{"1.0.0-beta.2", "1.0.0-beta.11", -1},
+	{"1.0.0-beta.11", "1.0.0-rc.1", -1},
+	{"1.0.0-rc.1", "1.0.0", -1},
+}
+
+func TestCompareVersions(t *testing.T) {
+	for _, tc := range testcases {
+		if r := CompareVersions(tc.a, tc.b); r != tc.r {
+			t.Errorf("compareVersions(%q, %q): %d != %d", tc.a, tc.b, r, tc.r)
+		}
+	}
+}