Add tests for heapviz tool.

.github/workflows/cargo_fmt.yml

@@ -5,6 +5,7 @@ on:
       - 'examples/*.rs'
       - 'libraries/**/*.rs'
       - 'src/**/*.rs'
+      - 'tools/**/*.rs'
       - 'patches/**'
       - '**/Cargo.toml'
       - '.cargo/config'
@@ -46,3 +47,9 @@ jobs:
         with:
           command: fmt
           args: --manifest-path libraries/crypto/Cargo.toml --all -- --check
+
+      - name: Cargo format tools/heapviz
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --manifest-path tools/heapviz/Cargo.toml --all -- --check

.github/workflows/heapviz_test.yml

@@ -0,0 +1,32 @@
+---
+name: Heapviz tool tests
+on:
+  push:
+    paths:
+      - 'tools/heapviz/**'
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  cbor_test:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Check heapviz tool
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --manifest-path tool/heapviz/Cargo.toml
+
+      - name: Unit testing of heapviz tool (debug mode)
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --manifest-path tool/heapviz/Cargo.toml
+
+      - name: Unit testing of heapviz tool (release mode)
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --manifest-path tool/heapviz/Cargo.toml --release