Add spec tests

This commit adds spec tests for the changes made in the previous
commit.

spec/classes/mysql_server_spec.rb

@@ -95,6 +95,46 @@
             )
           end
         end
+
+        context 'with an invalid install_secret_file path' do
+          let(:params) { {} }
+
+          [
+            '|| ls -la ||',
+            '|| touch /tmp/foo.txt ||',
+            '/tmp/foo.txt;echo',
+            'myPath;',
+            '\\myPath\\',
+            '//myPath has spaces//',
+            '/',
+            '.secret_file',
+          ].each do |path|
+            it do
+              params['install_secret_file'] = path
+              is_expected.to raise_error(Puppet::PreformattedError, %r{'#{Regexp.escape(path)}' is not a valid path.})
+            end
+          end
+        end
+      end
+
+      context 'with a valid install_secret_file path' do
+        let(:params) { {} }
+
+        [
+          '/tmp/foo.txt',
+          '/foo.txt',
+          '/.secret_file',
+        ].each do |path|
+          it do
+            params['install_secret_file'] = path
+            is_expected.to contain_exec('remove install pass')
+              .with(
+                command: "mysqladmin -u root --password=$(grep -o \'[^ ]\\+$\' #{path}) password \'\' && rm -f #{path}",
+                onlyif: "test -f #{path}",
+                path: '/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin',
+              )
+          end
+        end
       end
 
       context 'mysql::server::service' do