Support changing provider configurations during test steps

[paddycarver]

SDK version

v2.7.0

Use-cases

To be able to test upgrading providers between different versions, it would be helpful if we could specify a different set of providers per test step, not just in the test case.

Attempted Solutions

Proposal

Adding the ProviderFactories, ProtoV5ProviderFactories, ProtoV6ProviderFactories, and ExternalProviders properties from resource.TestCase to resource.TestStep.

References

[bflad]

The acceptance testing framework (helper/resource) in v2.17.0 now allows provider developers to specify providers at the TestStep level rather than just TestCase. This means that real world state migration/upgrade testing can now be implemented acceptance tests. e.g.

resource.Test(t, resource.TestCase{
	Steps: []resource.TestStep{
		{
			ExternalProviders: map[string]resource.ExternalProvider{
				"random": {
					VersionConstraint: "...", // last version of old schema version
					Source:            "example-namespace/example",
				},
			},
			Config: "...",
			Check:  /* ... */,
		},
		{
			ProviderFactories: testAccProviders,
			Config:            "...",
			Check:             /* ... */,
		},
	},
})

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