Add tests for stderr and file outputs

Author: lafriks

test/linters_test.go

@@ -2,6 +2,8 @@ package test
 
 import (
 	"bufio"
+	"fmt"
+	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -100,7 +102,7 @@ func TestGciLocal(t *testing.T) {
 func TestMultipleOutputs(t *testing.T) {
 	sourcePath := filepath.Join(testdataDir, "gci", "gci.go")
 	args := []string{
-		"--disable-all", "--print-issued-lines=false", "--print-linter-name=false", "--out-format=line-number,json",
+		"--disable-all", "--print-issued-lines=false", "--print-linter-name=false", "--out-format=line-number,json:stdout",
 		sourcePath,
 	}
 	rc := extractRunContextFromComments(t, sourcePath)
@@ -114,6 +116,52 @@ func TestMultipleOutputs(t *testing.T) {
 		ExpectOutputContains(`"Issues":[`)
 }
 
+func TestStderrOutput(t *testing.T) {
+	sourcePath := filepath.Join(testdataDir, "gci", "gci.go")
+	args := []string{
+		"--disable-all", "--print-issued-lines=false", "--print-linter-name=false", "--out-format=line-number,json:stderr",
+		sourcePath,
+	}
+	rc := extractRunContextFromComments(t, sourcePath)
+	args = append(args, rc.args...)
+
+	cfg, err := yaml.Marshal(rc.config)
+	require.NoError(t, err)
+
+	testshared.NewLintRunner(t).RunWithYamlConfig(string(cfg), args...).
+		ExpectHasIssue("testdata/gci/gci.go:7: File is not `gci`-ed").
+		ExpectOutputContains(`"Issues":[`)
+}
+
+func TestFileOutput(t *testing.T) {
+	f, err := os.CreateTemp("", "golangci_lint_test_result")
+	require.NoError(t, err)
+	f.Close()
+
+	resultPath := f.Name()
+	defer os.Remove(resultPath)
+
+	sourcePath := filepath.Join(testdataDir, "gci", "gci.go")
+	args := []string{
+		"--disable-all", "--print-issued-lines=false", "--print-linter-name=false",
+		fmt.Sprintf("--out-format=json:%s,line-number", resultPath),
+		sourcePath,
+	}
+	rc := extractRunContextFromComments(t, sourcePath)
+	args = append(args, rc.args...)
+
+	cfg, err := yaml.Marshal(rc.config)
+	require.NoError(t, err)
+
+	testshared.NewLintRunner(t).RunWithYamlConfig(string(cfg), args...).
+		ExpectHasIssue("testdata/gci/gci.go:7: File is not `gci`-ed").
+		ExpectOutputNotContains(`"Issues":[`)
+
+	b, err := ioutil.ReadFile(resultPath)
+	require.NoError(t, err)
+	require.Contains(t, string(b), `"Issues":[`)
+}
+
 func saveConfig(t *testing.T, cfg map[string]interface{}) (cfgPath string, finishFunc func()) {
 	f, err := os.CreateTemp("", "golangci_lint_test")
 	require.NoError(t, err)

test/testshared/testshared.go

@@ -76,6 +76,11 @@ func (r *RunResult) ExpectOutputContains(s string) *RunResult {
 	return r
 }
 
+func (r *RunResult) ExpectOutputNotContains(s string) *RunResult {
+	assert.NotContains(r.t, r.output, s, "exit code is %d", r.exitCode)
+	return r
+}
+
 func (r *RunResult) ExpectOutputEq(s string) *RunResult {
 	assert.Equal(r.t, s, r.output, "exit code is %d", r.exitCode)
 	return r