platformio-core: The system cannot find the file specified

I am getting this issue (replicated in full below)when trying to run tests for my project (unity has been successfully installed). Related to having a space in the path name?

I am on PlatformIO Core, version 6.1.4

Full error output

 Executing task: C:\Users\David Stewart\.platformio\penv\Scripts\platformio.exe test --verbose --environment QUTy 

Collected 1 tests (*)

Processing * in QUTy environment
------------------------------------------------------------------------------------------------------------------
Building...


Testing...
[WinError 2] The system cannot find the file specified
--------------------------------------- QUTy:* [ERRORED] Took 1.63 seconds ---------------------------------------

==================================================== SUMMARY ====================================================
Environment    Test    Status    Duration
-------------  ------  --------  ------------
QUTy           *       ERRORED   00:00:01.627
=================================== 1 test cases: 0 succeeded in 00:00:01.627 ===================================

 *  The terminal process "C:\Users\David Stewart\.platformio\penv\Scripts\platformio.exe 'test', '--verbose', '--environment', 'QUTy'" terminated with exit code: 1. 
 *  Terminal will be reused by tasks, press any key to close it. 

Test file

#include <stdio.h>
#include <stdbool.h>
#include "unity.h"

void setUp(void)
{
    // set stuff up here
}

void tearDown(void)
{
    // clean stuff up here
}

void test_ex(void)
{
    UNITY_TEST_ASSERT_EQUAL_UINT(1, 2, 17, "Intentionally failing test to sanity check the test setup");    
}


int main(void)
{
    UNITY_BEGIN();
    RUN_TEST(test_ex);
    return UNITY_END();
}

Test folder structure

The source file with the tests in it is directly under the test/ directory in the project.