Support C# in wit-bindgen test (#1207)

* Support C# in `wit-bindgen test`

Migrate various bits of logic to the new test runner. All codegen tests
are migrated and a single "demo" program is available to show the
runtime test at least somewhat works. Migrating more tests is left to
future work.

* Add runner support for C#

Author: alexcrichton

Diff for: .github/workflows/main.yml

@@ -98,17 +98,23 @@ jobs:
       shell: powershell
       if: matrix.os == 'windows-latest' && matrix.lang == 'moonbit'
 
+    # Run (now legacy) crate tests. This'll eventually go away
     - run: |
         cargo test \
           -p wit-bindgen-cli \
           -p wit-bindgen-${{ matrix.lang }} \
           --no-default-features \
           --features ${{ matrix.lang }} \
           --release
+
+    # Run all codegen tests for this language
     - run: |
-        cargo run test --languages rust,${{ matrix.lang }} tests/codegen \
+        cargo run test --languages ${{ matrix.lang }} tests/codegen \
           --artifacts target/artifacts \
           --rust-wit-bindgen-path ./crates/guest-rust
+
+    # Run all runtime tests for this language, and also enable Rust in case this
+    # language only implements either the runner or test component
     - run: |
         cargo run test --languages rust,${{ matrix.lang }} tests/runtime-new \
           --artifacts target/artifacts \

Diff for: Cargo.lock

@@ -25,11 +25,6 @@ clap = { workspace = true, optional = true }
 anyhow = { workspace = true }
 indexmap = { workspace = true }
 
-[dev-dependencies]
-test-helpers = { path = '../test-helpers' }
-wasm-encoder = { workspace = true }
-wasmparser = { workspace = true }
-
 [features]
 default = ["aot"]
 aot = []

Diff for: crates/csharp/Cargo.toml

@@ -11,6 +11,7 @@ pub struct CSProjectLLVMBuilder {
     aot: bool,
     clean_targets: bool,
     world_name: String,
+    binary: bool,
 }
 
 pub struct CSProjectMonoBuilder {
@@ -29,6 +30,7 @@ impl CSProject {
             aot: false,
             clean_targets: false,
             world_name: world_name.to_string(),
+            binary: false,
         }
     }
 
@@ -61,9 +63,15 @@ impl CSProjectLLVMBuilder {
             ),
         )?;
 
+        let output_type = if self.binary {
+            "<OutputType>Exe</OutputType>"
+        } else {
+            "<OutputType>Library</OutputType>"
+        };
+
         let mut csproj = format!(
             "<Project Sdk=\"Microsoft.NET.Sdk\">
-    
+
         <PropertyGroup>
             <TargetFramework>net9.0</TargetFramework>
             <LangVersion>preview</LangVersion>
@@ -73,8 +81,9 @@ impl CSProjectLLVMBuilder {
             <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
             <!-- treat these are errors so they are caught during code generation tests -->
             <WarningsAsErrors>CS0105</WarningsAsErrors>
+            {output_type}
         </PropertyGroup>
-        
+
         <PropertyGroup>
             <PublishTrimmed>true</PublishTrimmed>
             <AssemblyName>{name}</AssemblyName>
@@ -156,6 +165,10 @@ impl CSProjectLLVMBuilder {
         self.aot = true;
     }
 
+    pub fn binary(&mut self) {
+        self.binary = true;
+    }
+
     pub fn clean(&mut self) -> &mut Self {
         self.clean_targets = true;
 
@@ -178,7 +191,7 @@ impl CSProjectMonoBuilder {
 
         let mut csproj = format!(
             "<Project Sdk=\"Microsoft.NET.Sdk\">
-    
+
         <PropertyGroup>
             <TargetFramework>net9.0</TargetFramework>
             <RuntimeIdentifier>wasi-wasm</RuntimeIdentifier>
@@ -194,7 +207,7 @@ impl CSProjectMonoBuilder {
             <!-- treat these are errors so they are caught during code generation tests -->
             <WarningsAsErrors>CS0105</WarningsAsErrors>
         </PropertyGroup>
-        
+
         <PropertyGroup>
             <PublishTrimmed>true</PublishTrimmed>
             <AssemblyName>{name}</AssemblyName>

Diff for: crates/csharp/src/csproj.rs

@@ -30,3 +30,4 @@ wasmparser = { workspace = true, features = ["features"] }
 wat = { workspace = true }
 wit-component = { workspace = true }
 wit-parser = { workspace = true }
+wit-bindgen-csharp = { workspace = true }