codegen: unknown-resource test is broken

[abhinav]

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Issue details

In upgrading to Pulumi v3.76 (#474), we discovered that the unknown-resource codegen test is broken for this repository:

--- FAIL: TestGenerateProgram (0.00s)
    --- FAIL: TestGenerateProgram/unknown-resource (0.00s)
        program_driver.go:571: bind diags:
            Warning: unknown package 'unknown'

              on unknown-resource.pp line 0:
               1: resource provider "pulumi:providers:unknown" { }

            could not locate a compatible plugin in deploytest, the makefile and &
            constructor of the plugin host must define the location of the schema: failed to
            locate compatible plugin: "unknown"

            Warning: unknown package 'unknown'

              on unknown-resource.pp line 2:
               3: resource main "unknown:index:main" {

            could not locate a compatible plugin in deploytest, the makefile and &
            constructor of the plugin host must define the location of the schema: failed to
            locate compatible plugin: "unknown"

            Warning: unsupported attribute 'first'

              on unknown-resource.pp line 3:
               4:     first = "hello"

            unsupported attribute 'first'

            Warning: unsupported attribute 'second'

              on unknown-resource.pp line 4:
               5:     second = {

            unsupported attribute 'second'

            Warning: unknown package 'unknown'

              on unknown-resource.pp line 9:
              10: resource fromModule "unknown:eks:example" {

            could not locate a compatible plugin in deploytest, the makefile and &
            constructor of the plugin host must define the location of the schema: failed to
            locate compatible plugin: "unknown"

            Warning: unsupported attribute 'associatedMain'

              on unknown-resource.pp line 11:
              12:    associatedMain = main.id

            unsupported attribute 'associatedMain'

        gen_program_test.go:217:
                Error Trace:    /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/codegen/gen_program_test.go:217
                                                        /Users/abg/go/pkg/mod/github.com/pulumi/pulumi/pkg/v3@v3.76.1/codegen/testing/test/program_driver.go:635
                Error:          Received unexpected error:
                                1 error occurred:
                                        *
                                -error: ../testing/test/testdata/unknown-resource-pp/yaml/unknown-resource.yaml:3,11-35: error resolving type of resource provider: internal error loading package "unknown": could not locate a compatible plugin in deploytest, the makefile and & constructor of the plugin host must define the location of the schema: failed to locate compatible plugin: "unknown";
                                -error: ../testing/test/testdata/unknown-resource-pp/yaml/unknown-resource.yaml:5,11-23: error resolving type of resource main: internal error loading package "unknown": could not locate a compatible plugin in deploytest, the makefile and & constructor of the plugin host must define the location of the schema: failed to locate compatible plugin: "unknown";
                                -error: ../testing/test/testdata/unknown-resource-pp/yaml/unknown-resource.yaml:11,11-30: error resolving type of resource fromModule: internal error loading package "unknown": could not locate a compatible plugin in deploytest, the makefile and & constructor of the plugin host must define the location of the schema: failed to locate compatible plugin: "unknown";

                Test:           TestGenerateProgram/unknown-resource
FAIL

Affected area/feature