Get rid of push_back in favor of emplace_back

Change-Id: I4a0096441ed725eb21e42eb9cc17a173929e3788
diff --git a/tests/ls.cpp b/tests/ls.cpp
index 0a91dfb..58d4add 100644
--- a/tests/ls.cpp
+++ b/tests/ls.cpp
@@ -48,7 +48,7 @@
             SECTION("ls --recursive")
             {
                 input = "ls --recursive";
-                expected.m_options.push_back(LsOption::Recursive);
+                expected.m_options.emplace_back(LsOption::Recursive);
             }
         }
 
@@ -142,7 +142,7 @@
                 SECTION("cwd: /example:a") { parser.changeNode(dataPath_{Scope::Relative, {dataNode_(module_{"example"}, container_{"a"})}}); }
 
                 input = "ls --recursive /example:a";
-                expected.m_options.push_back(LsOption::Recursive);
+                expected.m_options.emplace_back(LsOption::Recursive);
                 expected.m_path = dataPath_{Scope::Absolute, {dataNode_(module_{"example"}, container_{"a"})}};
             }