diff --git a/src/go/types/version_test.go b/src/go/types/version_test.go
new file mode 100644
index 00000000000000..dc9becf9e18eaf
--- /dev/null
+++ b/src/go/types/version_test.go
@@ -0,0 +1,24 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package types
+
+import "testing"
+
+var parseGoVersionTests = []struct {
+	in  string
+	out version
+}{
+	{"go1.21", version{1, 21}},
+	{"go1.21.0", version{1, 21}},
+	{"go1.21rc2", version{1, 21}},
+}
+
+func TestParseGoVersion(t *testing.T) {
+	for _, tt := range parseGoVersionTests {
+		if out, err := parseGoVersion(tt.in); out != tt.out || err != nil {
+			t.Errorf("parseGoVersion(%q) = %v, %v, want %v, nil", tt.in, out, err, tt.out)
+		}
+	}
+}