setup component tests infra

also add `cargo component` to README and CI workflows

.github/workflows/compatibility-elixir.yml

@@ -35,11 +35,11 @@ jobs:
         with:
           toolchain: stable
 
-      - name: Add targets
+      - name: Add targets and install cargo-component
         run: |
           rustup target add wasm32-unknown-unknown
           rustup target add wasm32-wasip1
-
+          cargo install cargo-component
       - run: mix do deps.get, deps.compile
 
       - run: mix test

.github/workflows/elixir-ci.yml

@@ -28,6 +28,8 @@ jobs:
         with:
           toolchain: stable
 
+      - run: cargo install cargo-component
+
       - id: get-cache-key
         run: echo "key=mix-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ hashFiles('**/mix.lock') }}" >> $GITHUB_OUTPUT
 

README.md

@@ -88,6 +88,7 @@ rustup component add rustfmt
 rustup component add clippy
 rustup target add wasm32-unknown-unknown # to compile our example Wasm files for testing
 rustup target add wasm32-wasip1 # to compile our example Wasm/WASI files for testing
+cargo install cargo-component # to run component tests
 ```
 
 Then install the erlang/elixir dependencies:

test/fixture_projects/component_types/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "wasm32-unknown-unknown"

test/fixture_projects/component_types/.gitignore

@@ -0,0 +1,2 @@
+Cargo.lock
+src/bindings.rs

test/fixture_projects/component_types/.vscode/settings.json

@@ -0,0 +1,10 @@
+{
+  "rust-analyzer.check.overrideCommand": [
+    "cargo",
+    "component",
+    "check",
+    "--workspace",
+    "--all-targets",
+    "--message-format=json"
+  ]
+}

test/fixture_projects/component_types/.zed/settings.json

@@ -0,0 +1,20 @@
+// Folder-specific settings
+//
+// For a full list of overridable settings, and general information on folder-specific settings,
+// see the documentation: https://zed.dev/docs/configuring-zed#settings-files
+{
+  "lsp": {
+    "rust-analyzer": {
+      "check": {
+        "overrideCommand": [
+          "cargo",
+          "component",
+          "check",
+          "--workspace",
+          "--all-targets",
+          "--message-format=json"
+        ]
+      }
+    }
+  }
+}

test/fixture_projects/component_types/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "component-types"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+paste = "1.0.15"
+wit-bindgen-rt = { version = "0.33.0", features = ["bitflags"] }
+
+[lib]
+crate-type = ["cdylib"]
+
+[profile.release]
+codegen-units = 1
+opt-level = "s"
+debug = false
+strip = true
+lto = true
+
+[package.metadata.component]
+package = "fixtures:component-types"
+
+[package.metadata.component.dependencies]

test/fixture_projects/component_types/README.md

@@ -0,0 +1,10 @@
+Wasm component fixture to test converting types back and forth.
+
+Prerequisite: `cargo install cargo-component`
+
+To rebuild, run the following from this directory:
+```
+cargo component build --release
+```
+
+`mix test` will automatically compile the wasm file.

test/fixture_projects/component_types/src/lib.rs

@@ -0,0 +1,22 @@
+#[allow(warnings)]
+mod bindings;
+
+use bindings::Guest;
+use paste::paste;
+
+macro_rules! id_function {
+    ($wasm_ty:ident, $rust_ty:ty) => {
+        paste! {
+            fn [<id_ $wasm_ty>](v: $rust_ty) -> $rust_ty {
+                v
+            }
+        }
+    };
+}
+
+struct Component;
+impl Guest for Component {
+    id_function!(bool, bool);
+}
+
+bindings::export!(Component with_types_in bindings);

test/fixture_projects/component_types/wit/world.wit

@@ -0,0 +1,5 @@
+package fixtures:component-types;
+
+world fixtures {
+    export id-bool: func(v: bool) -> bool;
+}

test/test_helper.exs

@@ -6,6 +6,10 @@ defmodule TestHelper do
   @wasm_link_import_test_source_dir "#{@fixture_project_dir}/wasm_link_import_test"
   @wasm_import_test_source_dir "#{@fixture_project_dir}/wasm_import_test"
   @wasi_test_source_dir "#{@fixture_project_dir}/wasi_test"
+  @component_test_source_dir "#{@fixture_project_dir}/component_types"
+
+  def component_test_file_path,
+    do: "#{@component_test_source_dir}/target/wasm32-unknown-unknown/release/component_types.wasm"
 
   def wasm_test_file_path,
     do: "#{@wasm_test_source_dir}/target/wasm32-unknown-unknown/debug/wasmex_test.wasm"
@@ -28,6 +32,9 @@ defmodule TestHelper do
     do: "#{@wasi_test_source_dir}/target/wasm32-wasip1/debug/main.wasm"
 
   def precompile_wasm_files do
+    {"", 0} =
+      System.cmd("cargo", ["component", "build", "--release"], cd: @component_test_source_dir)
+
     {"", 0} = System.cmd("cargo", ["build"], cd: @wasm_test_source_dir)
     {"", 0} = System.cmd("cargo", ["build"], cd: @wasm_import_test_source_dir)
     {"", 0} = System.cmd("cargo", ["build"], cd: @wasm_link_import_test_source_dir)