version: validate Long format on Android builds

Updates #14069

Change-Id: I134a90db561dacc4b1c1c66ccadac135b5d64cf3
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

version/version_internal_test.go

@@ -0,0 +1,28 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+package version
+
+import "testing"
+
+func TestIsValidLongWithTwoRepos(t *testing.T) {
+	tests := []struct {
+		long string
+		want bool
+	}{
+		{"1.2.3-t01234abcde-g01234abcde", true},
+		{"1.2.259-t01234abcde-g01234abcde", true}, // big patch version
+		{"1.2.3-t01234abcde", false},              // missing repo
+		{"1.2.3-g01234abcde", false},              // missing repo
+		{"1.2.3-g01234abcde", false},              // missing repo
+		{"-t01234abcde-g01234abcde", false},
+		{"1.2.3", false},
+		{"1.2.3-t01234abcde-g", false},
+		{"1.2.3-t01234abcde-gERRBUILDINFO", false},
+	}
+	for _, tt := range tests {
+		if got := isValidLongWithTwoRepos(tt.long); got != tt.want {
+			t.Errorf("IsValidLongWithTwoRepos(%q) = %v; want %v", tt.long, got, tt.want)
+		}
+	}
+}