terraform test: referencing variables at testing file level results in a crash

[liamcervante]

Terraform Version

v1.7.0-rc2

Terraform Configuration Files

# main.tf

variable "input" {
    type = string
}

output "value" {
    value = var.input
} 

# main.tftest.hcl

variables {
  input = var.env_var_input
}

run "execute" {}

Debug Output

N/A

Expected Behavior

should not crash, and should be able to reference environment variable

Actual Behavior

terraform test
main.tftest.hcl... in progress

!!!!!!!!!!!!!!!!!!!!!!!!!!! TERRAFORM CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!!

Terraform crashed! This is always indicative of a bug within Terraform.
Please report the crash with Terraform[1] so that we can fix this.

When reporting bugs, please include your terraform version, the stack trace
shown below, and any additional information which may help replicate the issue.

[1]: https://github.com/hashicorp/terraform/issues

!!!!!!!!!!!!!!!!!!!!!!!!!!! TERRAFORM CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!!

runtime error: invalid memory address or nil pointer dereference
goroutine 11 [running]:
runtime/debug.Stack()
        /Users/runner/hostedtoolcache/go/1.21.5/x64/src/runtime/debug/stack.go:24 +0x64
runtime/debug.PrintStack()
        /Users/runner/hostedtoolcache/go/1.21.5/x64/src/runtime/debug/stack.go:16 +0x1c
github.com/hashicorp/terraform/internal/logging.PanicHandler()
        /Users/runner/work/terraform/terraform/internal/logging/panic.go:58 +0x164
panic({0x105df7600?, 0x107c13c30?})
        /Users/runner/hostedtoolcache/go/1.21.5/x64/src/runtime/panic.go:914 +0x218
github.com/hashicorp/terraform/internal/backend/local.(*TestFileRunner).GetVariables(0x14000a3def8, 0x1400017e9a0, 0x1400009d3b0, {0x0, 0x0, 0x102fc0560?})
        /Users/runner/work/terraform/terraform/internal/backend/local/test.go:1063 +0x530
github.com/hashicorp/terraform/internal/backend/local.(*TestFileRunner).run(0x14000a3def8, 0x1400009d3b0, 0x1400009d400, 0x1400091c370, 0x1400017e9a0)
        /Users/runner/work/terraform/terraform/internal/backend/local/test.go:405 +0x708
github.com/hashicorp/terraform/internal/backend/local.(*TestFileRunner).Test(0x14000a3def8, 0x1400009d400)
        /Users/runner/work/terraform/terraform/internal/backend/local/test.go:336 +0x48c
github.com/hashicorp/terraform/internal/backend/local.(*TestSuiteRunner).Test(0x140004c45a0)
        /Users/runner/work/terraform/terraform/internal/backend/local/test.go:140 +0x2bc
github.com/hashicorp/terraform/internal/command.(*TestCommand).Run.func1()
        /Users/runner/work/terraform/terraform/internal/command/test.go:230 +0x9c
created by github.com/hashicorp/terraform/internal/command.(*TestCommand).Run in goroutine 1
        /Users/runner/work/terraform/terraform/internal/command/test.go:224 +0xab4

Steps to Reproduce

terraform init
terraform test

Additional Context

No response

References

No response

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.