Add new function to normalize strings to avoid issues when comparing nested stuff. Add tests for nested comparison. Add new terraform plan in json as test data.

Depends on https://github.com/thiagonache/terraformtest/issues/3.

The test function ReadPlanFile should Fatal instead of Error since nothing can be done if it cannot read the file.

Also, we should update from wantBiggerThan := 2000 to want := the exact number of bytes.

I want to reduce the paperwork required to run a test. Eg.:

        tfPlan, err := terraformtest.ReadPlan("./mymodule.plan.json")
	if err != nil {
		t.Fatalf("Cannot read plan file ./mymodule.plan.json: %v", err)
	}

	wantResource := terraformtest.Resource{
		Address: "module.vpc.aws_vpc.this[0]",
		Metadata: map[string]string{
			"type": "aws_vpc",
			"name": "this",
		},
		Values: map[string]string{
			"enable_dns_hostnames":             "true",
			"enable_dns_support":               "true",
			"assign_generated_ipv6_cidr_block": "false",
			"cidr_block":                       "10.0.0.0/16",
			"instance_tenancy":                 "default",
		},
	}

	gotRS := tfPlan.Resources
	if !gotRS.Contains(wantResource) {
		t.Error(gotRS.Diff())
	}

Could be simplified to

	wantResource := terraformtest.Resource{
		Address: "module.vpc.aws_vpc.this[0]",
		Metadata: map[string]string{
			"type": "aws_vpc",
			"name": "this",
		},
		Values: map[string]string{
			"enable_dns_hostnames":             "true",
			"enable_dns_support":               "true",
			"assign_generated_ipv6_cidr_block": "false",
			"cidr_block":                       "10.0.0.0/16",
			"instance_tenancy":                 "default",
		},
	}

        r := terraformtest.New(
                terraformtest.WithPlanFile("./mymodule.plan.json")
        )
	terraformtest.Contains(wantResource)

Currently we can only test values but we may want to test some variables.

{
  "variables": {

  }
}

The transform function should also store the values inside of this block into the type Resource which will need an extra field probably called Variables which is going to be a map[string]string.

The functions Contains and Equal should be modified to consider the new data.

Please, also add respective tests for the new function 😄