Run test to confirm type mismatch errors and opportunities

[pietern]

Note: this PR only demonstrates the issue and doesn't solve it.

Changes

Confirm poor error message when provided with JSON that doesn't match the expected schema.

The default unmarshaller returns error:

invalid character '\n' in string literal

The dyn normalizer returns:

• expected sequence, found map testdata/job_cluster_test.json:14:14
• unknown field: name testdata/job_cluster_test.json:1:1

Tests