Setup GitHub actions CI

.codecov.yml

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+coverage:
+    status:
+        patch:
+            default:
+                target: '100'
+        project:
+            default:
+                target: '88'

.coveragerc

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+[run]
+source =
+    smithy_python
+
+[report]
+exclude_lines =
+    raise NotImplementedError

.github/workflows/ci.yml

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+name: CI
+
+on:
+    push:
+        branches: develop
+    pull_request:
+        branches: develop
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [3.6, 3.7, 3.8]
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v1
+      - name: Set Up Python - ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install tox
+        run: |
+          python${{ matrix.python-version }} -m pip install --upgrade tox
+      - name: Run tests
+        run: |
+          tox -e py
+      - name: Upload coverage
+        if: matrix.python-version == 3.7
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          file: ./coverage.xml
+          flags: unittests
+          name: codecov-umbrella
+          yml: ./codecov.yml
+          fail_ci_if_error: true

.github/workflows/lint.yml

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+name: Lint
+
+on:
+    push:
+        branches: develop
+    pull_request:
+        branches: develop
+
+jobs:
+  black-and-flake8:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v1
+      - name: Set Up Python 3.7
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - name: Install tox
+        run: |
+          python3.7 -m pip install tox
+      - name: Run linting
+        run: |
+            tox -e lint

.github/workflows/typecheck.yml

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+name: Type Check
+
+on:
+    push:
+        branches: develop
+    pull_request:
+        branches: develop
+
+jobs:
+  mypy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v1
+      - name: Set Up Python 3.7
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - name: Install tox
+        run: |
+          python3.7 -m pip install tox
+      - name: Run type checks
+        run: |
+            tox -e type

tests/unit/test_dummy.py

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+import smithy_python
+
+
+def test_version():
+    # TODO: Remove me when there's a real test
+    assert isinstance(smithy_python.__version__, str)

tox.ini

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+[tox]
+envlist = py36,py37,py38
+
+skipsdist = True
+
+[testenv]
+deps =
+    -r requirements-dev.txt
+    -e .
+commands =
+    pytest --cov-config=.coveragerc --cov=./ --cov-report=xml tests/functional tests/unit
+
+[testenv:lint]
+deps =
+    -r requirements-dev.txt
+commands =
+    black --check --diff smithy_python tests
+    flake8 smithy_python
+
+[testenv:type]
+deps =
+    -r requirements-dev.txt
+commands =
+    mypy smithy_python --strict
+
+[testenv:full_tests]
+deps =
+    -r requirements-dev.txt
+    -e .
+commands =
+    pytest --cov-config=.coveragerc --cov=./ --cov-report=xml tests