test(generate): it works

Cargo.toml

@@ -38,7 +38,7 @@ walkdir = "2"
 chrono = "0.4.6"
 
 [dev-dependencies]
-assert_cmd = "0.10.2"
+assert_cmd = "0.11"
 lazy_static = "1.1.0"
 predicates = "1.0.0"
 tempfile = "3"

tests/all/generate.rs

@@ -1,24 +1,16 @@
 use assert_cmd::prelude::*;
-use std::str;
 use utils;
 
 #[test]
 fn new_with_no_name_errors() {
     let fixture = utils::fixture::not_a_crate();
+    fixture.install_local_cargo_generate();
     fixture.wasm_pack().arg("new").assert().failure();
 }
 
 #[test]
-fn new_with_provided_name() {
+fn new_with_name_succeeds() {
     let fixture = utils::fixture::not_a_crate();
-    let cmd = fixture
-        .wasm_pack()
-        .arg("new")
-        .arg("--name")
-        .arg("ferris")
-        .assert();
-
-    let output = cmd.get_output();
-
-    assert!(str::from_utf8(&output.stdout).unwrap().contains("ferris"));
+    fixture.install_local_cargo_generate();
+    fixture.wasm_pack().arg("new").arg("hello").assert().success();
 }

tests/all/utils/fixture.rs

@@ -237,6 +237,32 @@ impl Fixture {
         download().unwrap().binary("wasm-bindgen").unwrap()
     }
 
+    /// Install a local cargo-generate for this fixture.
+    ///
+    /// Takes care not to re-install for every fixture, but only the one time
+    /// for the whole test suite.
+    pub fn install_local_cargo_generate(&self) -> PathBuf {
+        static INSTALL_CARGO_GENERATE: Once = ONCE_INIT;
+        let cache = self.cache();
+
+        let download = || {
+            if let Ok(download) =
+                install::download_prebuilt(&Tool::CargoGenerate, &cache, "latest", true)
+            {
+                return Ok(download);
+            }
+
+            install::cargo_install(Tool::CargoGenerate, &cache, "latest", true)
+        };
+
+        // Only one thread can perform the actual download, and then afterwards
+        // everything will hit the cache so we can run the same path.
+        INSTALL_CARGO_GENERATE.call_once(|| {
+            download().unwrap();
+        });
+        download().unwrap().binary("cargo-generate").unwrap()
+    }
+
     /// Download `geckodriver` and return its path.
     ///
     /// Takes care to ensure that only one `geckodriver` is downloaded for the whole
@@ -298,7 +324,8 @@ impl Fixture {
     /// directory and using the test cache.
     pub fn wasm_pack(&self) -> Command {
         use assert_cmd::prelude::*;
-        let mut cmd = Command::main_binary().unwrap();
+        let mut cmd = Command::cargo_bin(env!("CARGO_PKG_NAME"))
+    .unwrap();
         cmd.current_dir(&self.path);
         cmd.env("WASM_PACK_CACHE", self.cache_dir());
         cmd