Add unit test checking to cargo check

- Add `--profile test` flag to `cargo check` that will enable checking of unit tests.
- `--tests` will implicitly enable checking of unit tests within the lib.
- Don't implicitly compile binaries when using just `--test` filters.
- Fix erroneously linking tests when run with `--test`.

Fixes #3431, #4003, #4059, #4330.

src/bin/check.rs

@@ -2,7 +2,7 @@ use std::env;
 
 use cargo::core::Workspace;
 use cargo::ops::{self, CompileOptions, MessageFormat, Packages};
-use cargo::util::{CliResult, Config};
+use cargo::util::{CliResult, CliError, Config};
 use cargo::util::important_paths::find_root_manifest_for_wd;
 
 pub const USAGE: &'static str = "
@@ -28,6 +28,7 @@ Options:
     --benches                    Check all benches
     --all-targets                Check all targets (lib and bin targets by default)
     --release                    Check artifacts in release mode, with optimizations
+    --profile PROFILE            Profile to build the selected target for
     --features FEATURES          Space-separated list of features to also check
     --all-features               Check all available features
     --no-default-features        Do not check the `default` feature
@@ -53,6 +54,9 @@ Note that `--exclude` has to be specified in conjunction with the `--all` flag.
 Compilation can be configured via the use of profiles which are configured in
 the manifest. The default profile for this command is `dev`, but passing
 the --release flag will use the `release` profile instead.
+
+The `--profile test` flag can be used to check unit tests with the
+`#[cfg(test)]` attribute.
 ";
 
 #[derive(Deserialize)]
@@ -83,6 +87,7 @@ pub struct Options {
     flag_frozen: bool,
     flag_all: bool,
     flag_exclude: Vec<String>,
+    flag_profile: Option<String>,
     #[serde(rename = "flag_Z")]
     flag_z: Vec<String>,
 }
@@ -106,6 +111,17 @@ pub fn execute(options: Options, config: &mut Config) -> CliResult {
                                     &options.flag_exclude,
                                     &options.flag_package)?;
 
+    let test = options.flag_tests ||
+        match options.flag_profile.as_ref().map(|t| &t[..]) {
+            Some("test") => true,
+            None => false,
+            Some(profile) => {
+                let err = format!("unknown profile: `{}`, only `test` is currently supported",
+                                  profile).into();
+                return Err(CliError::new(err, 101))
+            }
+        };
+
     let opts = CompileOptions {
         config: config,
         jobs: options.flag_jobs,
@@ -114,10 +130,10 @@ pub fn execute(options: Options, config: &mut Config) -> CliResult {
         all_features: options.flag_all_features,
         no_default_features: options.flag_no_default_features,
         spec: spec,
-        mode: ops::CompileMode::Check,
+        mode: ops::CompileMode::Check{test:test},
         release: options.flag_release,
-        filter: ops::CompileFilter::new(options.flag_lib,
-                                        &options.flag_bin, options.flag_bins,
+        filter: ops::CompileFilter::new(options.flag_lib || options.flag_tests,
+                                        &options.flag_bin, options.flag_bins || options.flag_tests,
                                         &options.flag_test, options.flag_tests,
                                         &options.flag_example, options.flag_examples,
                                         &options.flag_bench, options.flag_benches,

src/bin/rustc.rs

@@ -102,7 +102,7 @@ pub fn execute(options: Options, config: &mut Config) -> CliResult {
         Some("dev") | None => CompileMode::Build,
         Some("test") => CompileMode::Test,
         Some("bench") => CompileMode::Bench,
-        Some("check") => CompileMode::Check,
+        Some("check") => CompileMode::Check {test: false},
         Some(mode) => {
             let err = format!("unknown profile: `{}`, use dev,
                                      test, or bench", mode).into();

src/cargo/core/manifest.rs

@@ -189,6 +189,7 @@ pub struct Profiles {
     pub doc: Profile,
     pub custom_build: Profile,
     pub check: Profile,
+    pub check_test: Profile,
     pub doctest: Profile,
 }
 
@@ -661,6 +662,14 @@ impl Profile {
         }
     }
 
+    pub fn default_check_test() -> Profile {
+        Profile {
+            check: true,
+            test: true,
+            ..Profile::default_dev()
+        }
+    }
+
     pub fn default_doctest() -> Profile {
         Profile {
             doc: true,

src/cargo/core/workspace.rs

@@ -545,6 +545,7 @@ impl<'cfg> Workspace<'cfg> {
                 doc: Profile::default_doc(),
                 custom_build: Profile::default_custom_build(),
                 check: Profile::default_check(),
+                check_test: Profile::default_check_test(),
                 doctest: Profile::default_doctest(),
             };
 

src/cargo/ops/cargo_clean.rs

@@ -54,10 +54,10 @@ pub fn clean(ws: &Workspace, opts: &CleanOptions) -> CargoResult<()> {
                 let Profiles {
                     ref release, ref dev, ref test, ref bench, ref doc,
                     ref custom_build, ref test_deps, ref bench_deps, ref check,
-                    ref doctest,
+                    ref check_test, ref doctest,
                 } = *profiles;
                 let profiles = [release, dev, test, bench, doc, custom_build,
-                                test_deps, bench_deps, check, doctest];
+                                test_deps, bench_deps, check, check_test, doctest];
                 for profile in profiles.iter() {
                     units.push(Unit {
                         pkg,

src/cargo/ops/cargo_compile.rs

@@ -92,7 +92,7 @@ impl<'a> CompileOptions<'a> {
 pub enum CompileMode {
     Test,
     Build,
-    Check,
+    Check { test: bool },
     Bench,
     Doc { deps: bool },
     Doctest,
@@ -478,7 +478,7 @@ fn generate_auto_targets<'a>(mode: CompileMode, targets: &'a [Target],
             }
             base
         }
-        CompileMode::Build | CompileMode::Check => {
+        CompileMode::Build | CompileMode::Check{..} => {
             targets.iter().filter(|t| {
                 t.is_bin() || t.is_lib()
             }).map(|t| BuildProposal {
@@ -603,11 +603,18 @@ fn generate_targets<'a>(pkg: &'a Package,
         CompileMode::Test => test,
         CompileMode::Bench => &profiles.bench,
         CompileMode::Build => build,
-        CompileMode::Check => &profiles.check,
+        CompileMode::Check {test: false} => &profiles.check,
+        CompileMode::Check {test: true} => &profiles.check_test,
         CompileMode::Doc { .. } => &profiles.doc,
         CompileMode::Doctest => &profiles.doctest,
     };
 
+    let test_profile = if profile.check {
+        &profiles.check_test
+    } else {
+        profile
+    };
+
     let targets = match *filter {
         CompileFilter::Default { required_features_filterable } => {
             let deps = if release {
@@ -631,15 +638,14 @@ fn generate_targets<'a>(pkg: &'a Package,
                     bail!("no library targets found")
                 }
             }
-
             targets.append(&mut propose_indicated_targets(
                 pkg, bins, "bin", Target::is_bin, profile)?);
             targets.append(&mut propose_indicated_targets(
-                pkg, examples, "example", Target::is_example, build)?);
+                pkg, examples, "example", Target::is_example, profile)?);
             targets.append(&mut propose_indicated_targets(
-                pkg, tests, "test", Target::is_test, test)?);
+                pkg, tests, "test", Target::is_test, test_profile)?);
             targets.append(&mut propose_indicated_targets(
-                pkg, benches, "bench", Target::is_bench, &profiles.bench)?);
+                pkg, benches, "bench", Target::is_bench, test_profile)?);
             targets
         }
     };

src/cargo/ops/cargo_rustc/context.rs

@@ -862,7 +862,7 @@ impl<'a, 'cfg> Context<'a, 'cfg> {
         ret.extend(self.maybe_lib(unit));
 
         // Integration tests/benchmarks require binaries to be built
-        if unit.profile.test &&
+        if unit.profile.test && !unit.profile.check &&
            (unit.target.is_test() || unit.target.is_bench()) {
             ret.extend(unit.pkg.targets().iter().filter(|t| {
                 let no_required_features = Vec::new();

src/cargo/util/toml/mod.rs

@@ -1041,6 +1041,8 @@ fn build_profiles(profiles: &Option<TomlProfiles>) -> Profiles {
         custom_build: Profile::default_custom_build(),
         check: merge(Profile::default_check(),
                      profiles.and_then(|p| p.dev.as_ref())),
+        check_test: merge(Profile::default_check_test(),
+                          profiles.and_then(|p| p.dev.as_ref())),
         doctest: Profile::default_doctest(),
     };
     // The test/bench targets cannot have panic=abort because they'll all get

tests/cargotest/install.rs

@@ -12,7 +12,7 @@ pub fn cargo_home() -> PathBuf {
 
 pub struct InstalledExe(pub &'static str);
 
-fn exe(name: &str) -> String {
+pub fn exe(name: &str) -> String {
     if cfg!(windows) {format!("{}.exe", name)} else {name.to_string()}
 }