Expand use of Github Actions (#580)

- Run on macOS, Ubuntu, and Windows
- Build and test
- Only lint and check completion scripts on non-windows OSs

.github/workflows/rust.yaml

@@ -1,10 +1,16 @@
-name: Rust
+name: Main
 
 on: [push]
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os:
+        - macos-latest
+        - ubuntu-latest
+        - windows-latest
+    runs-on: ${{matrix.os}}
     steps:
     - uses: actions/checkout@v1
     - name: Install
@@ -19,13 +25,19 @@ jobs:
         rustup --version
         cargo --version
         cargo clippy --version
+    - name: Build
+      run: cargo build --all --verbose
+    - name: Test
+      run: cargo test --all --verbose
     - name: Clippy
-      run: cargo clippy
+      run: cargo clippy --all
     - name: Lint
+      if: matrix.os != 'windows-latest'
       run: cargo run lint
     - name: Format
-      run: cargo fmt -- --check
+      run: cargo fmt --all -- --check
     - name: Completion Scripts
+      if: matrix.os != 'windows-latest'
       run: |
         for script in completions/*; do
           shell=${script##*.}

tests/integration.rs

@@ -2266,6 +2266,7 @@ test! {
   shell: false,
 }
 
+#[cfg(unix)]
 test! {
   name: set_shell,
   justfile: "
@@ -2283,6 +2284,24 @@ test! {
   shell: false,
 }
 
+#[cfg(windows)]
+test! {
+  name: set_shell,
+  justfile: "
+    set shell := ['echo', '-n']
+
+    x := `bar`
+
+    foo:
+      echo {{x}}
+      echo foo
+  ",
+  args: (),
+  stdout: "-n echo -n bar\r\r\n-n echo foo\r\n",
+  stderr: "echo -n bar\r\necho foo\n",
+  shell: false,
+}
+
 test! {
   name: dependency_argument_string,
   justfile: "