Version spec: slight improvements

spec/unit/version_spec.lua

@@ -5,10 +5,20 @@ describe("Version module", function()
         Version = require("version")
     end)
     it("should get current revision", function()
-        assert.is_true(22 >= (Version:getCurrentRevision()):len())
+        local rev = Version:getCurrentRevision()
+        local year, month, revision = rev:match("v(%d%d%d%d)%.(%d%d)-?(%d*)")
+        local commit = rev:match("-%d*-g(.*)")
+        assert.is_truthy(year)
+        assert.is_truthy(month)
+        assert.is_truthy(revision)
+        assert.is_truthy(commit)
+        assert.is_true(4 <= year:len())
+        assert.is_true(2 == month:len())
+        assert.is_true(1 <= revision:len())
+        assert.is_true(5 <= commit:len())
     end)
     it("should get normalized current version", function()
-        assert.is_true(9 >= tostring(Version:getNormalizedCurrentVersion()):len())
+        assert.is_true(7 <= tostring(Version:getNormalizedCurrentVersion()):len())
     end)
     it("should get normalized version", function()
         local rev = "v2015.11-982-g704d4238"