refact(ci): Refactored travis.yml file and introduced stages for unit test (#127)

Author: msohailhussain

.travis.yml

@@ -1,25 +1,18 @@
-env:
-  - GO111MODULE=on
-
-language: go
-go:
-  - 1.12.x
-  - master
-before_install:
-  - go get github.com/mattn/goveralls
+language: minimal
+env: GO111MODULE=on
 git:
   depth: 1
-script:
-  - go test -v -race ./... -coverprofile=profile.cov
-  - $GOPATH/bin/goveralls -coverprofile=profile.cov -service=travis-ci
+install:
+  - eval "$(gimme)"
 stages:
   - 'Lint'
   - 'Integration tests'
-  - 'Test'
+  - 'Unit test'
 jobs:
   include:
     - stage: 'Lint'
-      install:
+      env: GIMME_GO_VERSION=1.12.x GIMME_OS=linux GIMME_ARCH=amd64
+      before_script:
         - curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh| sh -s -- -b $(go env GOPATH)/bin v1.19.0
       script:
         - $GOPATH/bin/golangci-lint run --out-format=tab --tests=false optimizely/...
@@ -34,4 +27,28 @@ jobs:
       script:
         - "$HOME/travisci-tools/fsc-trigger/trigger_fullstack-sdk-compat.sh"
       after_success: travis_terminate 0
-      
+    - &test
+      stage: 'Unit test'
+      env: GIMME_GO_VERSION=master GIMME_OS=linux GIMME_ARCH=amd64      
+      script:
+        - go test -v -race ./... -coverprofile=profile.cov
+    - <<: *test
+      stage: 'Unit test'
+      env: GIMME_GO_VERSION=1.8.x
+      before_script:
+        # GO module was not introduced earlier. need symlink to search in GOPATH
+        - mkdir -p $GOPATH/src/github.com && pushd $GOPATH/src/github.com && ln -s $HOME/build/optimizely optimizely && popd
+      script:
+        # Need to download packages explicitly
+        - go get -v -d ./...
+        # This pkg not in go 1.8
+        - go get github.com/stretchr/testify
+        # -coverprofile was not introduced in 1.8
+        - go test -v -race ./...
+    - <<: *test
+      stage: 'Unit test'
+      env: GIMME_GO_VERSION=1.12.x
+      before_script:      
+        - go get github.com/mattn/goveralls
+      after_success:
+        - $GOPATH/bin/goveralls -coverprofile=profile.cov -service=travis-ci

README.md

@@ -1,7 +1,7 @@
 # Optimizely Go SDK
 
 [![Go Report Card](https://goreportcard.com/badge/github.com/optimizely/go-sdk)](https://goreportcard.com/report/github.com/optimizely/go-sdk)
-[![Coverage Status](https://coveralls.io/repos/github/optimizely/go-sdk/badge.svg?branch=go-alpha)](https://coveralls.io/github/optimizely/go-sdk?branch=go-alpha)
+[![Coverage Status](https://coveralls.io/repos/github/optimizely/go-sdk/badge.svg?branch=master)](https://coveralls.io/github/optimizely/go-sdk?branch=master)
 
 ## Usage