dev: add printers unit tests.

pkg/printers/checkstyle.go

@@ -5,6 +5,7 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io"
+	"sort"
 
 	"github.com/go-xmlfmt/xmlfmt"
 
@@ -79,6 +80,10 @@ func (p Checkstyle) Print(ctx context.Context, issues []result.Issue) error {
 		out.Files = append(out.Files, file)
 	}
 
+	sort.Slice(out.Files, func(i, j int) bool {
+		return out.Files[i].Name < out.Files[j].Name
+	})
+
 	data, err := xml.Marshal(&out)
 	if err != nil {
 		return err

pkg/printers/checkstyle_test.go

@@ -0,0 +1,57 @@
+//nolint:dupl
+package printers
+
+import (
+	"bytes"
+	"context"
+	"go/token"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/golangci/golangci-lint/pkg/result"
+)
+
+func TestCheckstyle_Print(t *testing.T) {
+	issues := []result.Issue{
+		{
+			FromLinter: "linter-a",
+			Severity:   "warning",
+			Text:       "some issue",
+			Pos: token.Position{
+				Filename: "path/to/filea.go",
+				Offset:   2,
+				Line:     10,
+				Column:   4,
+			},
+		},
+		{
+			FromLinter: "linter-b",
+			Severity:   "error",
+			Text:       "another issue",
+			SourceLines: []string{
+				"func foo() {",
+				"\tfmt.Println(\"bar\")",
+				"}",
+			},
+			Pos: token.Position{
+				Filename: "path/to/fileb.go",
+				Offset:   5,
+				Line:     300,
+				Column:   9,
+			},
+		},
+	}
+
+	buf := new(bytes.Buffer)
+	printer := NewCheckstyle(buf)
+
+	err := printer.Print(context.Background(), issues)
+	require.NoError(t, err)
+
+	//nolint:lll
+	expected := "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n\r\n<checkstyle version=\"5.0\">\r\n  <file name=\"path/to/filea.go\">\r\n    <error column=\"4\" line=\"10\" message=\"some issue\" severity=\"warning\" source=\"linter-a\">\r\n    </error>\r\n  </file>\r\n  <file name=\"path/to/fileb.go\">\r\n    <error column=\"9\" line=\"300\" message=\"another issue\" severity=\"error\" source=\"linter-b\">\r\n    </error>\r\n  </file>\r\n</checkstyle>\n"
+
+	assert.Equal(t, expected, buf.String())
+}

pkg/printers/codeclimate_test.go

@@ -0,0 +1,57 @@
+//nolint:dupl
+package printers
+
+import (
+	"bytes"
+	"context"
+	"go/token"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/golangci/golangci-lint/pkg/result"
+)
+
+func TestCodeClimate_Print(t *testing.T) {
+	issues := []result.Issue{
+		{
+			FromLinter: "linter-a",
+			Severity:   "warning",
+			Text:       "some issue",
+			Pos: token.Position{
+				Filename: "path/to/filea.go",
+				Offset:   2,
+				Line:     10,
+				Column:   4,
+			},
+		},
+		{
+			FromLinter: "linter-b",
+			Severity:   "error",
+			Text:       "another issue",
+			SourceLines: []string{
+				"func foo() {",
+				"\tfmt.Println(\"bar\")",
+				"}",
+			},
+			Pos: token.Position{
+				Filename: "path/to/fileb.go",
+				Offset:   5,
+				Line:     300,
+				Column:   9,
+			},
+		},
+	}
+
+	buf := new(bytes.Buffer)
+	printer := NewCodeClimate(buf)
+
+	err := printer.Print(context.Background(), issues)
+	require.NoError(t, err)
+
+	//nolint:lll
+	expected := `[{"description":"linter-a: some issue","severity":"warning","fingerprint":"BA73C5DF4A6FD8462FFF1D3140235777","location":{"path":"path/to/filea.go","lines":{"begin":10}}},{"description":"linter-b: another issue","severity":"error","fingerprint":"0777B4FE60242BD8B2E9B7E92C4B9521","location":{"path":"path/to/fileb.go","lines":{"begin":300}}}]`
+
+	assert.Equal(t, expected, buf.String())
+}

pkg/printers/github_test.go

@@ -1,14 +1,61 @@
 package printers
 
 import (
+	"bytes"
+	"context"
 	"go/token"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
+func TestGithub_Print(t *testing.T) {
+	issues := []result.Issue{
+		{
+			FromLinter: "linter-a",
+			Severity:   "warning",
+			Text:       "some issue",
+			Pos: token.Position{
+				Filename: "path/to/filea.go",
+				Offset:   2,
+				Line:     10,
+				Column:   4,
+			},
+		},
+		{
+			FromLinter: "linter-b",
+			Severity:   "error",
+			Text:       "another issue",
+			SourceLines: []string{
+				"func foo() {",
+				"\tfmt.Println(\"bar\")",
+				"}",
+			},
+			Pos: token.Position{
+				Filename: "path/to/fileb.go",
+				Offset:   5,
+				Line:     300,
+				Column:   9,
+			},
+		},
+	}
+
+	buf := new(bytes.Buffer)
+	printer := NewGithub(buf)
+
+	err := printer.Print(context.Background(), issues)
+	require.NoError(t, err)
+
+	expected := `::warning file=path/to/filea.go,line=10,col=4::some issue (linter-a)
+::error file=path/to/fileb.go,line=300,col=9::another issue (linter-b)
+`
+
+	assert.Equal(t, expected, buf.String())
+}
+
 func TestFormatGithubIssue(t *testing.T) {
 	sampleIssue := result.Issue{
 		FromLinter: "sample-linter",

pkg/printers/html_test.go

@@ -0,0 +1,160 @@
+package printers
+
+import (
+	"bytes"
+	"context"
+	"go/token"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/golangci/golangci-lint/pkg/result"
+)
+
+//nolint:lll
+const expectedHTML = `<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>golangci-lint</title>
+    <link rel="shortcut icon" type="image/png" href="https://golangci-lint.run/favicon-32x32.png">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.9.2/css/bulma.min.css"
+          integrity="sha512-byErQdWdTqREz6DLAA9pCnLbdoGGhXfU6gm1c8bkf7F51JVmUBlayGe2A31VpXWQP+eiJ3ilTAZHCR3vmMyybA=="
+          crossorigin="anonymous" referrerpolicy="no-referrer"/>
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/styles/default.min.css"
+          integrity="sha512-kZqGbhf9JTB4bVJ0G8HCkqmaPcRgo88F0dneK30yku5Y/dep7CZfCnNml2Je/sY4lBoqoksXz4PtVXS4GHSUzQ=="
+          crossorigin="anonymous" referrerpolicy="no-referrer"/>
+    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/highlight.min.js"
+            integrity="sha512-s+tOYYcC3Jybgr9mVsdAxsRYlGNq4mlAurOrfNuGMQ/SCofNPu92tjE7YRZCsdEtWL1yGkqk15fU/ark206YTg=="
+            crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/languages/go.min.js"
+            integrity="sha512-+UYV2NyyynWEQcZ4sMTKmeppyV331gqvMOGZ61/dqc89Tn1H40lF05ACd03RSD9EWwGutNwKj256mIR8waEJBQ=="
+            crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.production.min.js"
+            integrity="sha512-qlzIeUtTg7eBpmEaS12NZgxz52YYZVF5myj89mjJEesBd/oE9UPsYOX2QAXzvOAZYEvQohKdcY8zKE02ifXDmA=="
+            crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+    <script type="text/javascript"
+            src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.production.min.js"
+            integrity="sha512-9jGNr5Piwe8nzLLYTk8QrEMPfjGU0px80GYzKZUxi7lmCfrBjtyCc1V5kkS5vxVwwIB7Qpzc7UxLiQxfAN30dw=="
+            crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"
+            integrity="sha512-kp7YHLxuJDJcOzStgd6vtpxr4ZU9kjn77e6dBsivSz+pUuAuMlE2UTdKB7jjsWT84qbS8kdCWHPETnP/ctrFsA=="
+            crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+</head>
+<body>
+<section class="section">
+    <div class="container">
+        <div id="content"></div>
+    </div>
+</section>
+<script>
+    const data = {"Issues":[{"Title":"some issue","Pos":"path/to/filea.go:10:4","Linter":"linter-a","Code":""},{"Title":"another issue","Pos":"path/to/fileb.go:300:9","Linter":"linter-b","Code":"func foo() {\n\tfmt.Println(\"bar\")\n}"}]};
+</script>
+<script type="text/babel">
+  class Highlight extends React.Component {
+    componentDidMount() {
+      hljs.highlightElement(ReactDOM.findDOMNode(this));
+    }
+
+    render() {
+      return <pre className="go"><code>{this.props.code}</code></pre>;
+    }
+  }
+
+  class Issue extends React.Component {
+    render() {
+      return (
+        <div className="issue box">
+          <div>
+            <div className="columns">
+              <div className="column is-four-fifths">
+                <h5 className="title is-5 has-text-danger-dark">{this.props.data.Title}</h5>
+              </div>
+              <div className="column is-one-fifth">
+                <h6 className="title is-6">{this.props.data.Linter}</h6>
+              </div>
+            </div>
+            <strong>{this.props.data.Pos}</strong>
+          </div>
+          <div className="highlight">
+            <Highlight code={this.props.data.Code}/>
+          </div>
+        </div>
+      );
+    }
+  }
+
+  class Issues extends React.Component {
+    render() {
+      if (!this.props.data.Issues || this.props.data.Issues.length === 0) {
+        return (
+          <div>
+            <div className="notification">
+              No issues found!
+            </div>
+          </div>
+        );
+      }
+
+      return (
+        <div className="issues">
+          {this.props.data.Issues.map(issue => (<Issue data={issue}/>))}
+        </div>
+      );
+    }
+  }
+
+  ReactDOM.render(
+    <div className="content">
+      <div className="columns is-centered">
+        <div className="column is-three-quarters">
+          <Issues data={data}/>
+        </div>
+      </div>
+    </div>,
+    document.getElementById("content")
+  );
+</script>
+</body>
+</html>`
+
+func TestHTML_Print(t *testing.T) {
+	issues := []result.Issue{
+		{
+			FromLinter: "linter-a",
+			Severity:   "warning",
+			Text:       "some issue",
+			Pos: token.Position{
+				Filename: "path/to/filea.go",
+				Offset:   2,
+				Line:     10,
+				Column:   4,
+			},
+		},
+		{
+			FromLinter: "linter-b",
+			Severity:   "error",
+			Text:       "another issue",
+			SourceLines: []string{
+				"func foo() {",
+				"\tfmt.Println(\"bar\")",
+				"}",
+			},
+			Pos: token.Position{
+				Filename: "path/to/fileb.go",
+				Offset:   5,
+				Line:     300,
+				Column:   9,
+			},
+		},
+	}
+
+	buf := new(bytes.Buffer)
+	printer := NewHTML(buf)
+
+	err := printer.Print(context.Background(), issues)
+	require.NoError(t, err)
+
+	assert.Equal(t, expectedHTML, buf.String())
+}