Unsure if this is an issue with the codeLens parsing/displaying or RSpec itself. It looks like RSpec wants the line number to be the one that has the corresponding do.
Executing RSpec with fileName:3 will filter out all of the examples.
Executing RSpec with fileName:5 will behave as expected.
3: describe MyClass,
4: tag1: :team,
5: tag2: :unit do
6: describe "#foo" do
7: subject { described_class.foo }
The codeLens will attempt to execute fileName:3