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test(build-std): Expand existing -Zbuild-std tests #17399

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9c49360
test(unit-graph): Capture existing behaviour in unit-graph test
adamgemmell Aug 10, 2026
08d8949
test(build-std): Capture existing lockfile behaviour
adamgemmell Aug 21, 2026
25830ae
test(build-std): Capture existing status messages behaviour
adamgemmell Aug 21, 2026
59b7301
test(build-std): Capture existing cargo metadata behaviour
adamgemmell Aug 7, 2026
1381c3c
test(build-std): Capture existing cargo tree behaviour
adamgemmell Aug 7, 2026
e9e00c1
test(build-std): Capture existing cargo vendor behaviour
adamgemmell Aug 7, 2026
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342 changes: 341 additions & 1 deletion tests/testsuite/standard_lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ struct Setup {
real_sysroot: String,
}

fn setup() -> Setup {
pub(crate) fn publish_mock_std_registry_packages() {
// Our mock sysroot requires a few packages from crates.io, so make sure
// they're "published" to crates.io. Also edit their code a bit to make sure
// that they have access to our custom crates with custom apis.
Expand Down Expand Up @@ -83,6 +83,10 @@ fn setup() -> Setup {
.add_dep(Dependency::new("rustc-std-workspace-std", "*").optional(true))
.feature("mockbuild", &["rustc-std-workspace-std"])
.publish();
}

fn setup() -> Setup {
publish_mock_std_registry_packages();

let p = ProjectBuilder::new(paths::root().join("rustc-wrapper"))
.file(
Expand Down Expand Up @@ -384,6 +388,342 @@ fn check_core() {
.run();
}

#[cargo_test(build_std_mock)]
fn build_std_does_not_change_lockfile() {
let setup = setup();
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.1.0"
edition = "2021"
"#,
)
.file(
"src/main.rs",
r#"
fn main() {
std::custom_api();
}
"#,
)
.build();

p.cargo("generate-lockfile").build_std(&setup).run();
let gen_lockfile = p.read_lockfile();

p.cargo("build").build_std(&setup).run();
let build_lockfile = p.read_lockfile();

assert_eq!(gen_lockfile, build_lockfile);
assert_eq!(
gen_lockfile,
r##"# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

[[package]]
name = "foo"
version = "0.1.0"
"##
);
}

#[cargo_test(build_std_mock)]
fn builtins_do_not_show_in_package_diff_status_messages() {
let setup = setup();
let p = project()
.file("src/lib.rs", "#![no_std]")
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.1.0"
edition = "2021"

[dependencies]
registry-dep-using-core = "1.0"
"#,
)
.build();

// New lockfile
p.cargo("generate-lockfile")
.build_std_arg(&setup, "std")
.with_stderr_data(str![[r#"
[UPDATING] `dummy-registry` index
[LOCKING] 1 package [..]
"#]])
.run();

// Updating lockfile
p.cargo("add registry-dep-using-alloc")
.build_std_arg(&setup, "core")
.with_stderr_data(str![[r#"
[UPDATING] `dummy-registry` index
[ADDING] registry-dep-using-alloc v1.0.0 to dependencies
Features:
- mockbuild
- rustc-std-workspace-alloc
- rustc-std-workspace-core
[LOCKING] 1 package to highest compatible version
[ADDING] registry-dep-using-alloc v1.0.0

"#]])
.run();
}

#[cargo_test(build_std_mock)]
fn builtins_do_not_show_in_metadata() {
let setup = setup();
let p = project()
.file("src/lib.rs", "#![no_std]")
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.1.0"

[dependencies]
registry-dep-using-core = "1.0"
"#,
)
.build();

p.cargo("metadata")
.build_std_arg(&setup, "core")
.with_stdout_data(
str![[r#"
{
"packages": [
{
"name": "foo",
"version": "0.1.0",
"id": "path+[ROOTURL]/foo#0.1.0",
"license": null,
"license_file": null,
"description": null,
"source": null,
"dependencies": [
{
"name": "registry-dep-using-core",
"source": "registry+https://github.com/rust-lang/crates.io-index",
"req": "^1.0",
"kind": null,
"rename": null,
"optional": false,
"uses_default_features": true,
"features": [],
"target": null,
"registry": null
}
],
"targets": [
{
"kind": [
"lib"
],
"crate_types": [
"lib"
],
"name": "foo",
"src_path": "[ROOT]/foo/src/lib.rs",
"edition": "2015",
"doc": true,
"doctest": true,
"test": true
}
],
"features": {},
"manifest_path": "[ROOT]/foo/Cargo.toml",
"metadata": null,
"publish": null,
"authors": [],
"categories": [],
"keywords": [],
"readme": null,
"repository": null,
"homepage": null,
"documentation": null,
"edition": "2015",
"links": null,
"default_run": null,
"rust_version": null
},
{
"name": "registry-dep-using-core",
"version": "1.0.0",
"id": "registry+https://github.com/rust-lang/crates.io-index#registry-dep-using-core@1.0.0",
"license": null,
"license_file": null,
"description": null,
"source": "registry+https://github.com/rust-lang/crates.io-index",
"dependencies": [
{
"name": "rustc-std-workspace-core",
"source": "registry+https://github.com/rust-lang/crates.io-index",
"req": "*",
"kind": null,
"rename": null,
"optional": true,
"uses_default_features": true,
"features": [],
"target": null,
"registry": null
}
],
"targets": [
{
"kind": [
"lib"
],
"crate_types": [
"lib"
],
"name": "registry_dep_using_core",
"src_path": "[ROOT]/home/.cargo/registry/src/-[HASH]/registry-dep-using-core-1.0.0/src/lib.rs",
"edition": "2015",
"doc": true,
"doctest": true,
"test": true
}
],
"features": {
"mockbuild": [
"rustc-std-workspace-core"
],
"rustc-std-workspace-core": [
"dep:rustc-std-workspace-core"
]
},
"manifest_path": "[ROOT]/home/.cargo/registry/src/-[HASH]/registry-dep-using-core-1.0.0/Cargo.toml",
"metadata": null,
"publish": null,
"authors": [],
"categories": [],
"keywords": [],
"readme": null,
"repository": null,
"homepage": null,
"documentation": null,
"edition": "2015",
"links": null,
"default_run": null,
"rust_version": null
}
],
"workspace_members": [
"path+[ROOTURL]/foo#0.1.0"
],
"workspace_default_members": [
"path+[ROOTURL]/foo#0.1.0"
],
"resolve": {
"nodes": [
{
"id": "path+[ROOTURL]/foo#0.1.0",
"dependencies": [
"registry+https://github.com/rust-lang/crates.io-index#registry-dep-using-core@1.0.0"
],
"deps": [
{
"name": "registry_dep_using_core",
"pkg": "registry+https://github.com/rust-lang/crates.io-index#registry-dep-using-core@1.0.0",
"dep_kinds": [
{
"kind": null,
"target": null
}
]
}
],
"features": []
},
{
"id": "registry+https://github.com/rust-lang/crates.io-index#registry-dep-using-core@1.0.0",
"dependencies": [
],
"deps": [],
"features": []
}
],
"root": "path+[ROOTURL]/foo#0.1.0"
},
"target_directory": "[ROOT]/foo/target",
"build_directory": "[ROOT]/foo/target",
"version": 1,
"workspace_root": "[ROOT]/foo",
"metadata": null
}
"#]].is_json(),
)
.run();
}

#[cargo_test(build_std_mock)]
fn builtins_do_not_show_in_tree() {
let setup = setup();
let p = project()
.file("src/lib.rs", "#![no_std]")
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.1.0"

[dependencies]
registry-dep-using-core = "1.0"
"#,
)
.build();

p.cargo("tree")
.build_std_arg(&setup, "core")
.with_stdout_data(str![[r#"
foo v0.1.0 ([ROOT]/foo)
└── registry-dep-using-core v1.0.0

"#]])
.run();
}

#[cargo_test(build_std_mock)]
fn builtins_are_not_vendored() {
let setup = setup();
let p = project()
.file("src/lib.rs", "#![no_std]")
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.1.0"

[dependencies]
registry-dep-using-core = "1.0"
"#,
)
.build();

// --respect-source-config is required to use the crates.io replacement in the test harness
p.cargo("vendor --respect-source-config")
.build_std_arg(&setup, "core")
.run();

assert!(
p.root()
.join("vendor/registry-dep-using-core/Cargo.toml")
.is_file()
);
assert!(!p.root().join("vendor/core").exists());
assert!(!p.root().join("vendor/compiler_builtins").exists());
}

#[cargo_test(build_std_mock)]
fn build_std_with_no_arg_for_core_only_target() {
let target = "aarch64-unknown-none";
Expand Down
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