In v7 ReadMe there is written, that ember v3.28 is supported, but in package.json there is ember-source v4 as peerDependency, which is also correct, because @ember/test-helpers v3 requires v4.
I was running in this wrong documentation while updating.
In v7 ReadMe there is written, that ember v3.28 is supported, but in package.json there is ember-source v4 as peerDependency, which is also correct, because @ember/test-helpers v3 requires v4.
I was running in this wrong documentation while updating.