add spec for linux user lib

Author: h00die

spec/lib/msf/core/post/linux/user_spec.rb

@@ -0,0 +1,37 @@
+require 'spec_helper'
+
+RSpec.describe Msf::Post::Linux::User do
+  subject do
+    mod = ::Msf::Module.new
+    mod.extend described_class
+    mod
+  end
+
+  describe '#get_home_dir' do
+    let(:user) { 'testuser' }
+    let(:expected_command) { "grep '^#{user}:' /etc/passwd | cut -d ':' -f 6" }
+
+    context 'when the user exists' do
+      it 'returns the home directory path from /etc/passwd' do
+        expect(tester).to receive(:cmd_exec)
+          .with(expected_command)
+          .and_return("/home/testuser\n")
+
+        result = tester.get_home_dir(user)
+        expect(result).to eq('/home/testuser')
+      end
+    end
+
+    context 'when the user does not exist in /etc/passwd' do
+      it 'returns an empty string' do
+        expect(tester).to receive(:cmd_exec)
+          .with(expected_command)
+          .and_return("\n")
+
+        result = tester.get_home_dir(user)
+        expect(result).to eq('')
+      end
+    end
+
+  end
+end