`@context` test not spec compliant

[PatStLouis]

Shouldn't this test suite follow the VC data model specification?

This test checks for subsequent items to be strings, however in the spec it allows for objects:

it('credential "@context" items MUST be strings.', async function() {
        this.test.cell = {
          columnId: name,
          rowId: this.test.title
        };
        const body = createRequestBody({issuer});
        const invalidContextTypes = [{foo: true}, 4, false, null];
        for(const invalidContextType of invalidContextTypes) {
          body.credential['@context'] = invalidContextType;
          const {result, error} = await issuer.post({json: {...body}});
          shouldThrowInvalidInput({result, error});
        }
      });

The spec reads:
Subsequent items in the array MUST express context information and be composed of any combination of URIs or objects.