add options to pass features in mutagen runner

Author: samuelpilz

.travis.yml

@@ -13,4 +13,7 @@ script:
 
   # run executable cargo-mutagen on test project
   - pushd examples/simple
-  - cargo run --bin cargo-mutagen --package cargo-mutagen
+  - cargo run --package cargo-mutagen
+  - popd
+  - pushd examples/feature-gated
+  - cargo run --package cargo-mutagen -- --features with_mutagen

Cargo.toml

@@ -6,6 +6,7 @@ members = [
     "mutagen-transform",
     "mutagen-selftest",
     "examples/simple",
+    "examples/feature-gated",
     "examples/with-integration-tests-v1",
     "examples/with-integration-tests-v2",
 ]

examples/feature-gated/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "feature-gated"
+version = "0.2.0"
+authors = ["Samuel Pilz <[email protected]>"]
+edition = "2018"
+
+[dev-dependencies]
+mutagen = {path = "../../mutagen"}
+
+[lib]
+doctest = false
+
+[features]
+with_mutagen = []
+

examples/feature-gated/src/lib.rs

@@ -0,0 +1,14 @@
+#[cfg_attr(all(test, feature = "with_mutagen"), ::mutagen::mutate)]
+pub fn foo() -> i32 {
+    1 + 2
+}
+
+#[cfg(test)]
+mod tests {
+    use super::foo;
+
+    #[test]
+    fn test_foo() {
+        assert_eq!(foo(), 3);
+    }
+}

mutagen-runner/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cargo-mutagen"
-version = "0.2.0"
+version = "0.2.1"
 authors = ["Andre Bogus <[email protected]>", "Samuel Pilz <[email protected]>"]
 edition = "2018"
 
@@ -12,6 +12,7 @@ serde_json = "1.0"
 mutagen-core = { path = "../mutagen-core"}
 console = "0.9.1"
 humantime = "2.0.0"
+structopt = "0.3"
 
 [badges]
 travis-ci = { repository = "llogiq/mutagen", branch = "master" }

mutagen-runner/src/main.rs

@@ -21,11 +21,25 @@ fn main() {
     }
 }
 
+use structopt::StructOpt;
+#[derive(StructOpt, Debug)]
+struct Options {
+    /// Space-separated list of features to activate
+    #[structopt(long, name = "FEATURES")]
+    features: Option<String>,
+
+    /// Activate all available features
+    #[structopt(long)]
+    all_features: bool,
+}
+
 fn run() -> Fallible<()> {
     let mutagen_start = Instant::now();
 
+    let opt = Options::from_args();
+
     // build the testsuites and collect mutations
-    let test_bins = compile_tests()?;
+    let test_bins = compile_tests(&opt)?;
     if test_bins.is_empty() {
         bail!("no test executable(s) found");
     }
@@ -102,12 +116,21 @@ fn run_mutations(
 }
 
 /// build all tests and collect test-suite executables
-fn compile_tests() -> Fallible<Vec<PathBuf>> {
+fn compile_tests(opt: &Options) -> Fallible<Vec<PathBuf>> {
     let mut tests: Vec<PathBuf> = Vec::new();
 
+    let mut feature_args: Vec<&str> = vec![];
+    if let Some(f) = &opt.features {
+        feature_args.extend(&["--features", f]);
+    }
+    if opt.all_features {
+        feature_args.push("--all-features");
+    }
+
     // execute `cargo test --no-run --message-format=json` and collect output
     let compile_out = Command::new("cargo")
         .args(&["test", "--no-run", "--message-format=json"])
+        .args(&feature_args)
         .stderr(Stdio::inherit())
         .output()?;
     if !compile_out.status.success() {