Add MacOS check and test to CI (#744)

adds macos checks and tests to pull request ci

.github/workflows/rust.yml

@@ -54,6 +54,21 @@ jobs:
           command: check
           args: -v
 
+  check_on_macos:
+    name: Check on MacOS
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          profile: minimal
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: -v
+
   test_on_linux:
     name: Test Suite on Linux
     runs-on: ubuntu-latest
@@ -103,6 +118,21 @@ jobs:
           command: test
           args: -v
 
+  test_on_macos:
+    name: Test Suite on MacOS
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          profile: minimal
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: -v
+
   fmt:
     name: Rustfmt
     runs-on: ubuntu-latest