Add -Zbuild-std test

.github/workflows/rust.yml

@@ -60,3 +60,26 @@ jobs:
       run: cargo test --verbose
     - name: Test no-rustc mode
       run: cargo check --no-default-features
+
+  nightly-integration:
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            host_target: x86_64-unknown-linux-gnu
+          - os: macos-latest
+            host_target: x86_64-apple-darwin
+          - os: windows-latest
+            host_target: i686-pc-windows-msvc
+    runs-on: ${{ matrix.os }}
+    # Run tests under a directory with a space in it to double check the windows path heuristic
+    defaults:
+      run:
+        working-directory: "dir with spaces/ui test"
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        path: "dir with spaces/ui test"
+    - uses: dtolnay/rust-toolchain@nightly
+    - name: Run ui tests
+      run: cargo test --verbose --test integration -- --check

tests/integrations/basic-bin/Cargo.stdout

@@ -3,8 +3,10 @@ running 0 tests
 
 test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished 
 
+Building dependencies ... ok
+tests/actual_tests/foomp.rs ... ok
 Building dependencies ... ok
 tests/actual_tests/foomp.rs ... ok
 
-test result: ok. 1 passed;
+test result: ok. 2 passed;
 

tests/integrations/basic-bin/tests/ui_tests.rs

@@ -28,8 +28,18 @@ fn main() -> ui_test::color_eyre::Result<()> {
     config.out_dir = tmp_dir.into();
     config.path_stderr_filter(tmp_dir, "$$TMP");
 
+    // try with build-std
+    let config_build_std = config.clone();
+    config.comment_defaults.base().set_custom(
+        "dependencies",
+        DependencyBuilder {
+            build_std: Some(String::new()),
+            ..DependencyBuilder::default()
+        },
+    );
+
     run_tests_generic(
-        vec![config],
+        vec![config, config_build_std],
         default_file_filter,
         default_per_file_config,
         // Avoid github actions, as these would end up showing up in `Cargo.stderr`