add UnitTest CI

Author: johnnychen94

.github/workflows/ci.yml

@@ -0,0 +1,55 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+    tags: '*'
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        julia-version: ['1.3', '1', 'nightly']
+        os: [ubuntu-latest]
+        arch: [x64]
+        include:
+          - os: windows-latest
+            julia-version: '1'
+            arch: x64
+          - os: macOS-latest
+            julia-version: '1'
+            arch: x64
+          - os: [ubuntu-latest]
+            julia-version: '1'
+            arch: x86
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: "Set up Julia"
+        uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.julia-version }}
+          arch: ${{ matrix.arch }}
+
+      - name: Cache artifacts
+        uses: actions/cache@v1
+        env:
+          cache-name: cache-artifacts
+        with:
+          path: ~/.julia/artifacts 
+          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-test-${{ env.cache-name }}-
+            ${{ runner.os }}-test-
+            ${{ runner.os }}-
+      - name: "Unit Test"
+        uses: julia-actions/julia-runtest@master
+
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info

README.md

@@ -1,4 +1,8 @@
 # OpenEXR.jl
+
+[![Build Status](https://github.com/twadleigh/OpenEXR.jl/workflows/CI/badge.svg)](https://github.com/twadleigh/OpenEXR.jl/actions?query=workflow%3A%22CI%22+branch%3Amaster)
+[![codecov.io](http://codecov.io/github/twadleigh/OpenEXR.jl/coverage.svg?branch=master)](http://codecov.io/github/twadleigh/OpenEXR.jl?branch=master)
+
 Saving and loading of OpenEXR files.
 
 Basic usage:

test/runtests.jl

@@ -62,4 +62,4 @@ using Test, OpenEXR, FileIO, Colors, FixedPointNumbers
             end
         end
     end
-end
+end