github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/sql/opt/optgen/cmd/optfmt/main_test.go (about)

     1  // Copyright 2020 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package main
    12  
    13  import (
    14  	"fmt"
    15  	"strings"
    16  	"testing"
    17  
    18  	"github.com/cockroachdb/datadriven"
    19  )
    20  
    21  func TestPretty(t *testing.T) {
    22  	datadriven.Walk(t, "testdata", func(t *testing.T, path string) {
    23  		datadriven.RunTest(t, path, prettyTest)
    24  	})
    25  }
    26  
    27  func prettyTest(t *testing.T, d *datadriven.TestData) string {
    28  	switch d.Cmd {
    29  	case "pretty":
    30  		n := defaultWidth
    31  		if d.HasArg("n") {
    32  			d.ScanArgs(t, "n", &n)
    33  		}
    34  		exprgen := d.HasArg("expr")
    35  		s, err := prettyify(strings.NewReader(d.Input), n, exprgen)
    36  		if err != nil {
    37  			return fmt.Sprintf("ERROR: %s", err)
    38  		}
    39  
    40  		// Verify we round trip correctly by ensuring non-whitespace
    41  		// scanner tokens are encountered in the same order.
    42  		{
    43  			origToks := toTokens(d.Input)
    44  			prettyToks := toTokens(s)
    45  			for i, tok := range origToks {
    46  				if i >= len(prettyToks) {
    47  					t.Fatalf("pretty ended early after %d tokens", i+1)
    48  				}
    49  				if prettyToks[i] != tok {
    50  					t.Log(s)
    51  					t.Logf("expected %q", tok)
    52  					t.Logf("got %q", prettyToks[i])
    53  					t.Fatalf("token %d didn't match", i+1)
    54  				}
    55  			}
    56  			if len(prettyToks) > len(origToks) {
    57  				t.Fatalf("orig ended early after %d tokens", len(origToks))
    58  			}
    59  		}
    60  		// Verify lines aren't too long.
    61  		{
    62  			for i, line := range strings.Split(s, "\n") {
    63  				if strings.HasPrefix(line, "#") {
    64  					continue
    65  				}
    66  				if len(line) > defaultWidth {
    67  					t.Errorf("line %d is %d chars, expected <= %d:\n%s", i+1, len(line), defaultWidth, line)
    68  				}
    69  			}
    70  		}
    71  
    72  		return s
    73  	default:
    74  		t.Fatal("unknown command")
    75  		return ""
    76  	}
    77  }