diff --git a/versioning_test.go b/versioning_test.go
index 99fa537..c0c44bf 100644
--- a/versioning_test.go
+++ b/versioning_test.go
@@ -51,6 +51,24 @@ func TestParse(t *testing.T) {
 		{versionStr: "12345", valid: true, expectedStr: "12345.0.0", expectedCode: 1234500000},
 		{versionStr: "42948", valid: true, expectedStr: "42948.0.0", expectedCode: 4294800000},
 		{versionStr: "42949", valid: false},
+
+		{versionStr: "1 ", valid: false},
+		{versionStr: " 1", valid: false},
+		{versionStr: "a1", valid: false},
+		{versionStr: "1a", valid: false},
+
+		{versionStr: "1.1 ", valid: false},
+		{versionStr: "1. 1", valid: false},
+		{versionStr: "1.1a", valid: false},
+		{versionStr: "1.a1", valid: false},
+
+		{versionStr: "1.1.1 ", valid: false},
+		{versionStr: "1.1. 1", valid: false},
+		{versionStr: "1.1.1a", valid: false},
+		{versionStr: "1.1.a1", valid: false},
+		{versionStr: "1,1.1", valid: false},
+		{versionStr: "1!1.1", valid: false},
+		{versionStr: "1 1.1", valid: false},
 	}
 
 	for i, c := range cases {