dev: add tests on linterdb package

pkg/lint/lintersdb/enabled_set.go

@@ -148,11 +148,14 @@ func (es EnabledSet) combineGoAnalysisLinters(linters map[string]*linter.Config)
 		if !ok {
 			continue
 		}
+
 		if lnt.LoadMode() == goanalysis.LoadModeWholeProgram {
 			// It's ineffective by CPU and memory to run whole-program and incremental analyzers at once.
 			continue
 		}
+
 		goanalysisLinters = append(goanalysisLinters, lnt)
+
 		for _, p := range lc.InPresets {
 			goanalysisPresets[p] = true
 		}
@@ -185,6 +188,7 @@ func (es EnabledSet) combineGoAnalysisLinters(linters map[string]*linter.Config)
 	ml := goanalysis.NewMetaLinter(goanalysisLinters)
 
 	presets := maps.Keys(goanalysisPresets)
+	sort.Strings(presets)
 
 	mlConfig := &linter.Config{
 		Linter:           ml,
@@ -197,6 +201,7 @@ func (es EnabledSet) combineGoAnalysisLinters(linters map[string]*linter.Config)
 	mlConfig = mlConfig.WithLoadForGoAnalysis()
 
 	linters[ml.Name()] = mlConfig
+
 	es.debugf("Combined %d go/analysis linters into one metalinter", len(goanalysisLinters))
 }
 

pkg/lint/lintersdb/enabled_set_test.go

@@ -4,12 +4,91 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/golangci/golangci-lint/pkg/config"
+	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
 	"github.com/golangci/golangci-lint/pkg/lint/linter"
+	"github.com/golangci/golangci-lint/pkg/logutils"
 )
 
-func TestGetEnabledLintersSet(t *testing.T) {
+type dummyLogger struct{}
+
+func (d dummyLogger) Fatalf(_ string, _ ...any) {}
+
+func (d dummyLogger) Panicf(_ string, _ ...any) {}
+
+func (d dummyLogger) Errorf(_ string, _ ...any) {}
+
+func (d dummyLogger) Warnf(_ string, _ ...any) {}
+
+func (d dummyLogger) Infof(_ string, _ ...any) {}
+
+func (d dummyLogger) Child(_ string) logutils.Log {
+	return nil
+}
+
+func (d dummyLogger) SetLevel(_ logutils.LogLevel) {}
+
+func TestEnabledSet_GetEnabledLintersMap(t *testing.T) {
+	m := NewManager(nil, nil)
+
+	cfg := config.NewDefault()
+
+	cfg.Linters.DisableAll = true
+	cfg.Linters.Enable = []string{"gofmt"}
+
+	es := NewEnabledSet(m, NewValidator(m), dummyLogger{}, cfg)
+
+	lintersMap, err := es.GetEnabledLintersMap()
+	require.NoError(t, err)
+
+	gofmtConfigs := m.GetLinterConfigs("gofmt")
+	typecheckConfigs := m.GetLinterConfigs("typecheck")
+
+	expected := map[string]*linter.Config{
+		"gofmt":     gofmtConfigs[0],
+		"typecheck": typecheckConfigs[0],
+	}
+
+	assert.Equal(t, expected, lintersMap)
+}
+
+func TestEnabledSet_GetOptimizedLinters(t *testing.T) {
+	m := NewManager(nil, nil)
+
+	cfg := config.NewDefault()
+
+	cfg.Linters.DisableAll = true
+	cfg.Linters.Enable = []string{"gofmt"}
+
+	es := NewEnabledSet(m, NewValidator(m), dummyLogger{}, cfg)
+
+	optimizedLinters, err := es.GetOptimizedLinters()
+	require.NoError(t, err)
+
+	gofmtConfigs := m.GetLinterConfigs("gofmt")
+	typecheckConfigs := m.GetLinterConfigs("typecheck")
+
+	var gaLinters []*goanalysis.Linter
+	for _, l := range gofmtConfigs {
+		gaLinters = append(gaLinters, l.Linter.(*goanalysis.Linter))
+	}
+	for _, l := range typecheckConfigs {
+		gaLinters = append(gaLinters, l.Linter.(*goanalysis.Linter))
+	}
+
+	mlConfig := &linter.Config{
+		Linter:    goanalysis.NewMetaLinter(gaLinters),
+		InPresets: []string{"bugs", "format"},
+	}
+
+	expected := []*linter.Config{mlConfig.WithLoadForGoAnalysis()}
+
+	assert.Equal(t, expected, optimizedLinters)
+}
+
+func TestEnabledSet_build(t *testing.T) {
 	type cs struct {
 		cfg  config.Linters
 		name string   // test case name
@@ -94,7 +173,7 @@ func TestGetEnabledLintersSet(t *testing.T) {
 	}
 
 	m := NewManager(nil, nil)
-	es := NewEnabledSet(m, NewValidator(m), nil, nil)
+	es := NewEnabledSet(m, NewValidator(m), dummyLogger{}, nil)
 
 	for _, c := range cases {
 		c := c
@@ -117,3 +196,68 @@ func TestGetEnabledLintersSet(t *testing.T) {
 		})
 	}
 }
+
+func TestEnabledSet_combineGoAnalysisLinters(t *testing.T) {
+	m := NewManager(nil, nil)
+
+	es := NewEnabledSet(m, NewValidator(m), dummyLogger{}, config.NewDefault())
+
+	foo := goanalysis.NewLinter("foo", "example foo", nil, nil).WithLoadMode(goanalysis.LoadModeTypesInfo)
+	bar := goanalysis.NewLinter("bar", "example bar", nil, nil).WithLoadMode(goanalysis.LoadModeTypesInfo)
+
+	testCases := []struct {
+		desc     string
+		linters  map[string]*linter.Config
+		expected map[string]*linter.Config
+	}{
+		{
+			desc: "no combined, one linter",
+			linters: map[string]*linter.Config{
+				"foo": {
+					Linter:    foo,
+					InPresets: []string{"A"},
+				},
+			},
+			expected: map[string]*linter.Config{
+				"foo": {
+					Linter:    foo,
+					InPresets: []string{"A"},
+				},
+			},
+		},
+		{
+			desc: "combined, several linters",
+			linters: map[string]*linter.Config{
+				"foo": {
+					Linter:    foo,
+					InPresets: []string{"A"},
+				},
+				"bar": {
+					Linter:    bar,
+					InPresets: []string{"B"},
+				},
+			},
+			expected: func() map[string]*linter.Config {
+				mlConfig := &linter.Config{
+					Linter:    goanalysis.NewMetaLinter([]*goanalysis.Linter{bar, foo}),
+					InPresets: []string{"A", "B"},
+				}
+
+				return map[string]*linter.Config{
+					"goanalysis_metalinter": mlConfig.WithLoadForGoAnalysis(),
+				}
+			}(),
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			es.combineGoAnalysisLinters(test.linters)
+
+			assert.Equal(t, test.expected, test.linters)
+		})
+	}
+}