Struct TestBackendEmission 

pub struct TestBackendEmission {
    pub setup_block: String,
    pub arg_expr: String,
    pub type_imports: Vec<String>,
    pub teardown_block: String,
}

Emission result for a test backend stub.

There is deliberately no “nothing emitted” constructor and no Default impl: every TestBackendEmission a caller obtains must carry a real, compilable stub. A language or configuration that cannot produce one panics before a value is ever returned (see emit_test_backend and each per-language emitter) rather than handing back a placeholder callers must remember to check. ~keep

Fields

setup_block: String

Code emitted at the top of the test function: stub class/struct definition.

arg_expr: String

Expression passed as the register_X arg: stub instance or Bridge-wrapped instance.

type_imports: Vec<String>

Short symbol names that must be imported at the file or function scope for the generated stub to compile. Rust backend populates this with the trait name and any named return/parameter types so that callers can emit the appropriate use module::Symbol; statements. Other language backends leave this empty — they manage imports internally.

teardown_block: String

Optional teardown statements emitted after the fixture call and its assertions, used to undo registry mutations performed by trait-bridge fixtures (e.g. unregister_ocr_backend("test-backend")).

Test runners that share a process across tests (python pytest, ruby rspec, dart test, etc.) leak registered test backends into later tests; without a teardown the next OCR-using fixture fails because the global registry contains only test-backend and the core’s ensure_ocr_backends_initialized self-heal only triggers when the registry is empty. Emitting unregister_<trait>(<name>) here drains the test backend so the next access re-seeds the defaults.

Languages that run each test in its own process (Rust cargo integration tests, Go) leave this empty.

Trait Implementations

impl Clone for TestBackendEmission

fn clone(&self) -> TestBackendEmission

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TestBackendEmission

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.