diff --git a/common/path_test.go b/common/path_test.go
new file mode 100644
index 0000000000..ecd31f9dbd
--- /dev/null
+++ b/common/path_test.go
@@ -0,0 +1,37 @@
+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package common
+
+import "testing"
+
+func TestAbsolutePath(t *testing.T) {
+	tests := []struct {
+		datadir  string
+		filename string
+		expected string
+	}{
+		{"", "/tmp/testfile.txt", "/tmp/testfile.txt"},
+		{"/tmp", "/tmp/testfile.txt", "/tmp/testfile.txt"},
+		{"/home/user/data", "myfile.txt", "/home/user/data/myfile.txt"},
+	}
+	for _, test := range tests {
+		path := AbsolutePath(test.datadir, test.filename)
+		if path != test.expected {
+			t.Errorf("%s: got %q, want %q", test.filename, path, test.expected)
+		}
+	}
+}