Introduce golangci-lint (#77)

* Introduce golangci-lint

* Create .golangci.yaml

* Update gobreaker_test.go

* Update gobreaker_test.go

* Update .golangci.yaml

.github/workflows/test.yml

@@ -8,16 +8,14 @@ jobs:
         os: [ubuntu-latest]
     runs-on: ${{matrix.os}}
     steps:
-    - name: Set up Go
-      uses: actions/setup-go@v2
+    - name: Setup Go
+      uses: actions/setup-go@v5
       with:
         go-version: ${{matrix.go-version}}
     - name: Checkout
-      uses: actions/checkout@v2
-    - name: gofmt
-      run: test -z "`gofmt -l .`"
-    - name: golint
-      run: test -z "`golint ./...`"
+      uses: actions/checkout@v4
+    - name: Lint
+      uses: golangci/golangci-lint-action@v6
     - name: go test
       run: go test -v ./...
     - name: Run example

.golangci.yaml

@@ -0,0 +1,15 @@
+linters:
+  enable:
+  - gofmt
+  - goimports
+  - gosec
+  - misspell
+issues:
+  exclude-rules:
+  - path: _test\.go
+    linters:
+    - gosec
+    - govet
+  - path: example/
+    linters:
+    - gosec

gobreaker_test.go

@@ -1,7 +1,7 @@
 package gobreaker
 
 import (
-	"fmt"
+	"errors"
 	"runtime"
 	"testing"
 	"time"
@@ -55,7 +55,7 @@ func succeed2Step(cb *TwoStepCircuitBreaker) error {
 
 func fail(cb *CircuitBreaker) error {
 	msg := "fail"
-	_, err := cb.Execute(func() (interface{}, error) { return nil, fmt.Errorf(msg) })
+	_, err := cb.Execute(func() (interface{}, error) { return nil, errors.New(msg) })
 	if err.Error() == msg {
 		return nil
 	}
@@ -322,7 +322,7 @@ func TestTwoStepCircuitBreaker(t *testing.T) {
 }
 
 func TestPanicInRequest(t *testing.T) {
-	assert.Panics(t, func() { causePanic(defaultCB) })
+	assert.Panics(t, func() { _ = causePanic(defaultCB) })
 	assert.Equal(t, Counts{1, 0, 1, 0, 1}, defaultCB.counts)
 }