(Add test case for fuzzy package feature adding rust-lang#10680)

tests/testsuite/cargo_add/features_fuzzy/in/Cargo.toml

@@ -0,0 +1,9 @@
+[workspace]
+
+[package]
+name = "cargo-list-test-fixture"
+version = "0.0.0"
+edition = "2015"
+
+[dependencies]
+your-face = { version = "99999.0.0", features = ["nose"] }

tests/testsuite/cargo_add/features_fuzzy/mod.rs

@@ -0,0 +1,32 @@
+use cargo_test_support::compare::assert_ui;
+use cargo_test_support::current_dir;
+use cargo_test_support::file;
+use cargo_test_support::prelude::*;
+use cargo_test_support::str;
+use cargo_test_support::Project;
+
+#[cargo_test]
+fn case() {
+    cargo_test_support::registry::init();
+    cargo_test_support::registry::Package::new("your-face", "99999.0.0+my-package")
+        .feature("nose", &[])
+        .feature("mouth", &[])
+        .feature("eyes", &[])
+        .feature("ears", &[])
+        .publish();
+
+    let project = Project::from_template(current_dir!().join("in"));
+    let project_root = project.root();
+    let cwd = &project_root;
+
+    snapbox::cmd::Command::cargo_ui()
+        .arg("add")
+        .arg_line("your_face -F eyes")
+        .current_dir(cwd)
+        .assert()
+        .success()
+        .stdout_matches(str![""])
+        .stderr_matches(file!["stderr.term.svg"]);
+
+    assert_ui().subset_matches(current_dir!().join("out"), &project_root);
+}

tests/testsuite/cargo_add/features_fuzzy/out/Cargo.toml

@@ -0,0 +1,9 @@
+[workspace]
+
+[package]
+name = "cargo-list-test-fixture"
+version = "0.0.0"
+edition = "2015"
+
+[dependencies]
+your-face = { version = "99999.0.0", features = ["eyes", "nose"] }

tests/testsuite/cargo_add/mod.rs

@@ -25,6 +25,7 @@ mod features;
 mod features_activated_over_limit;
 mod features_deactivated_over_limit;
 mod features_empty;
+mod features_fuzzy;
 mod features_multiple_occurrences;
 mod features_preserve;
 mod features_spaced_values;