add test-case for unit (#1)

* add test-case for `unit`

* rustfmt 2021

Author: justjavac

.github/workflows/ci.yml

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+name: ci
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: ${{ matrix.kind }} ${{ matrix.os }} ${{ matrix.rust }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: 
+          - macOS-latest
+          - ubuntu-latest
+          - windows-latest
+        rust:
+          # - stable
+          # - beta
+          - nightly
+
+    env:
+      CARGO_INCREMENTAL: 0
+      RUST_BACKTRACE: full
+      CARGO_TERM_COLOR: always
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v2
+
+      - name: Install rust (${{ matrix.rust }}) toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          profile: minimal
+          override: true
+          components: rustfmt, clippy
+
+      - name: Log versions
+        run: |
+          rustc --version
+          cargo --version
+
+      - name: Configure cargo data directory
+        # After this point, all cargo registry and crate data is stored in
+        # $GITHUB_WORKSPACE/.cargo_home. This allows us to cache only the files
+        # that are needed during the build process. Additionally, this works
+        # around a bug in the 'cache' action that causes directories outside of
+        # the workspace dir to be saved/restored incorrectly.
+        run: |
+          echo "CARGO_HOME=$(pwd)/.cargo_home" >> $GITHUB_ENV
+
+      - name: Cache
+        uses: actions/cache@v2
+        with:
+          # Note: crates from the denoland/deno git repo always get rebuilt,
+          # and their outputs ('deno', 'libdeno.rlib' etc.) are quite big,
+          # so we cache only those subdirectories of target/{debug|release} that
+          # contain the build output for crates that come from the registry.
+          path: |-
+            .cargo_home
+            target/*/.*
+            target/*/build
+            target/*/deps
+          key:
+            ${{ matrix.config.os }}-${{ matrix.config.rust }}-${{ hashFiles('Cargo.lock') }}
+          restore-keys: |
+            ${{ matrix.config.os }}-${{ matrix.config.rust }}
+
+      - name: Run cargo fmt
+        run: cargo fmt --all -- --check
+
+      - name: Run cargo check
+        run: cargo check --locked
+
+      - name: Run cargo clippy
+        run: cargo clippy -- -D warnings
+
+      - name: Build release
+        run: cargo build --release --locked
+
+      - name: Run cargo test
+        run: cargo test --locked
+
+      - name: Publish
+        if: |
+          startsWith(matrix.os, 'ubuntu') &&
+          startsWith(github.repository, 'postcss-rs') &&
+          startsWith(github.ref, 'refs/tags/')
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        run: |
+          cargo publish

.gitignore

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+/target
+/.cargo_home
+*.log
+.idea
+node_modules
+.DS_Store
+.tmp

.rustfmt.toml

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+max_width = 100
+tab_spaces = 2
+edition = "2021"