CreateObject returns Invalid

[xgouchet]

I'm trying to test a custom component, using the following code:

• components/MyComponent.xml:

  <component name="MyComponent" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://devtools.web.roku.com/schema/RokuSceneGraph.xsd">
  <script type="text/brightscript" uri="pkg:/components/MyComponent.brs" />
  </component>

• components/MyComponent.brs:

  function init()
  print "init() called"
  end function

• tests/MyComponent.test.brs:

  function main(args as object) as object
  return roca(args).describe("A sample test suite", sub()
      m.it("has a task", sub()
          test = CreateObject("roSGNode", "MyComponent")
          m.assert.isValid(test, "Should be valid")
      end sub)
  end sub)
  end function

Running the test always fails with the following output:

      m.assert.isValid: Should be valid
      + expected - actual

      -null
      +non-invalid

      at m.assert.isValid (src/tests/MyComponent.test.brs:5:12)

Whenever I try creating another type of object, for instance CreateObject("roDeviceInfo"), then the test succeeds.