add some more tests

.github/workflows/coverage.yml

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+name: coverage
+
+on: [push, pull_request]
+
+jobs:
+  coverage:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    name: Test `cargo-llvm-cov` on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    env:
+      CARGO_TERM_COLOR: always
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - run: rustup toolchain install stable --profile minimal --component llvm-tools-preview
+
+      - uses: taiki-e/install-action@cargo-llvm-cov
+
+      - uses: ./
+        with:
+          workspaces: tests
+
+      - run: cargo llvm-cov --all-features --workspace
+        working-directory: tests

.github/workflows/install.yml

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+name: install
+
+on: [push, pull_request]
+
+jobs:
+  install:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    name: Test `cargo install` on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    env:
+      CARGO_TERM_COLOR: always
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - run: rustup toolchain install stable --profile minimal
+
+      - uses: ./
+
+      - run: cargo install cargo-deny --locked

.github/workflows/simple.yml

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+name: simple
+
+on: [push, pull_request]
+
+jobs:
+  simple:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    name: Test `cargo check/test` on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    env:
+      CARGO_TERM_COLOR: always
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - run: rustup toolchain install stable --profile minimal
+
+      - uses: ./
+        with:
+          workspaces: tests
+
+      - run: |
+          cargo check
+          cargo test
+        working-directory: tests

.github/workflows/target-dir.yml

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+name: target-dir
+
+on: [push, pull_request]
+
+jobs:
+  target-dir:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    name: Test custom target-dir on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    env:
+      CARGO_TERM_COLOR: always
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - run: rustup toolchain install stable --profile minimal
+
+      # the `workspaces` option has the format `$workspace -> $target-dir`
+      # and the `$target-dir` is relative to the `$workspace`.
+      - uses: ./
+        with:
+          workspaces: tests -> ../custom-target-dir
+
+      - run: cargo test --manifest-path tests/Cargo.toml --target-dir custom-target-dir

.github/workflows/workspaces.yml

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+name: workspaces
+
+on: [push, pull_request]
+
+jobs:
+  workspaces:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    name: Test multiple workspaces on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    env:
+      CARGO_TERM_COLOR: always
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - run: rustup toolchain install stable --profile minimal --target wasm32-unknown-unknown
+
+      - uses: ./
+        with:
+          workspaces: |
+            tests
+            tests/wasm-workspace
+
+      - run: cargo check
+        working-directory: tests
+
+      - run: cargo check
+        working-directory: tests/wasm-workspace