util_test.go

Documentation: golang.org/x/tools/go/analysis/passes/internal/analysisutil

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package analysisutil_test
     6  
     7  import (
     8  	"go/ast"
     9  	"go/parser"
    10  	"go/token"
    11  	"go/types"
    12  	"testing"
    13  
    14  	"golang.org/x/tools/go/analysis/passes/internal/analysisutil"
    15  )
    16  
    17  func TestHasSideEffects(t *testing.T) {
    18  	src := `package p
    19  
    20  type T int
    21  
    22  type G[P any] int
    23  
    24  func _() {
    25  	var x int
    26  	_ = T(x)
    27  	_ = G[int](x)
    28  }
    29  `
    30  	fset := token.NewFileSet()
    31  	file, err := parser.ParseFile(fset, "p.go", src, 0)
    32  	if err != nil {
    33  		t.Fatal(err)
    34  	}
    35  	var conf types.Config
    36  	info := &types.Info{
    37  		Types: make(map[ast.Expr]types.TypeAndValue),
    38  	}
    39  	_, err = conf.Check("", fset, []*ast.File{file}, info)
    40  	if err != nil {
    41  		t.Fatal(err)
    42  	}
    43  	ast.Inspect(file, func(node ast.Node) bool {
    44  		call, ok := node.(*ast.CallExpr)
    45  		if !ok {
    46  			return true
    47  		}
    48  		if got := analysisutil.HasSideEffects(info, call); got != false {
    49  			t.Errorf("HasSideEffects(%s) = true, want false", types.ExprString(call))
    50  		}
    51  		return true
    52  	})
    53  }
    54

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