tests: Add test for exec timeout and adjust expected error

New exec implementation returns a different error when the command is
not found.

Signed-off-by: Andre Detsch <andre.detsch@foundries.io>

Author: detsch

tests/exec_test.cc

@@ -17,11 +17,9 @@ TEST(Exec, FailedExec) {
   } catch (const std::exception& exc) {
     const std::string err_msg{exc.what()};
 
-    ASSERT_NE(err_msg.find("failed to run command"), std::string::npos);
+    ASSERT_NE(err_msg.find("not found"), std::string::npos) << "Actual error message: " + err_msg;
     ASSERT_NE(err_msg.find(executable), std::string::npos) << "Actual error message: " + err_msg;
     ;
-    ASSERT_NE(err_msg.find("No such file or directory"), std::string::npos) << "Actual error message: " + err_msg;
-    ;
   }
 }
 
@@ -41,6 +39,18 @@ TEST(Exec, SuccessfulExecFailedExecutable) {
   }
 }
 
+TEST(Exec, ExecTimeout) {
+  const std::string cmd{"sleep 10"};
+
+  try {
+    exec(cmd, "", "", nullptr, "2s", false);
+  } catch (const std::runtime_error& exc) {
+    const std::string err_msg{exc.what()};
+
+    ASSERT_NE(err_msg.find("Timeout"), std::string::npos) << "Actual error message: " + err_msg;
+  }
+}
+
 int main(int argc, char** argv) {
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();