Mojo test

Did anyone get unit tests working?
I run

mojo test

mojo test

mojo test

mojo test on the following folder structure:

├── my_package
│   ├── __init__.:fire:
│   └── tensor.:fire:
└── test
    ├── __init__.:fire:
    └── test_tensor.:fire:

├── my_package
│   ├── __init__.:fire:
│   └── tensor.:fire:
└── test
    ├── __init__.:fire:
    └── test_tensor.:fire:

├── my_package
│   ├── __init__.:fire:
│   └── tensor.:fire:
└── test
    ├── __init__.:fire:
    └── test_tensor.:fire:

├── my_package
│   ├── __init__.:fire:
│   └── tensor.:fire:
└── test
    ├── __init__.:fire:
    └── test_tensor.:fire:

But it doesn't pick up my tests

Total Discovered Tests: 0

Total Discovered Tests: 0

Total Discovered Tests: 0

Total Discovered Tests: 0.
The test_tensor.

contains a function:

def test_transformation():
  ...

def test_transformation():
  ...

def test_transformation():
  ...

def test_transformation():
  ...

As described in the docs: https://docs.modular.com/mojo/tools/testing
Any suggestions?

Testing Mojo programs.