src/internal/coverage/cformat/fmt_test.go

// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package cformat_test

import (
	"internal/coverage"
	"internal/coverage/cformat"
	"strings"
	"testing"
)

func TestBasics(t *testing.T) {
	fm := cformat.NewFormatter(coverage.CtrModeAtomic)
	fm.SetPackage("my/pack")

	mku := func(stl, enl, nx uint32) coverage.CoverableUnit {
		return coverage.CoverableUnit{
			StLine:  stl,
			EnLine:  enl,
			NxStmts: nx,
		}
	}
	fn1units := []coverage.CoverableUnit{
		mku(10, 11, 2),
		mku(15, 11, 1),
	}
	fn2units := []coverage.CoverableUnit{
		mku(20, 25, 3),
		mku(30, 31, 2),
		mku(33, 40, 7),
	}
	fn3units := []coverage.CoverableUnit{
		mku(99, 100, 1),
	}
	for k, u := range fn1units {
		fm.AddUnit("p.go", "f1", false, u, uint32(k))
	}
	for k, u := range fn2units {
		fm.AddUnit("q.go", "f2", false, u, 0)
		fm.AddUnit("q.go", "f2", false, u, uint32(k))
	}
	for _, u := range fn3units {
		fm.AddUnit("lit.go", "f3", true, u, 0)
	}

	var b1, b2, b3 strings.Builder
	if err := fm.EmitTextual(&b1); err != nil {
		t.Fatalf("EmitTextual returned %v", err)
	}
	wantText := strings.TrimSpace(`
mode: atomic
lit.go:99.0,100.0 1 0
p.go:10.0,11.0 2 0
p.go:15.0,11.0 1 1
q.go:20.0,25.0 3 0
q.go:30.0,31.0 2 1
q.go:33.0,40.0 7 2`)
	gotText := strings.TrimSpace(b1.String())
	if wantText != gotText {
		t.Errorf("emit text: got:\n%s\nwant:\n%s\n", gotText, wantText)
	}

	if err := fm.EmitPercent(&b2, "", false); err != nil {
		t.Fatalf("EmitPercent returned %v", err)
	}
	wantPercent := strings.TrimSpace(`
my/pack	coverage: 62.5% of statements
`)
	gotPercent := strings.TrimSpace(b2.String())
	if wantPercent != gotPercent {
		t.Errorf("emit percent: got:\n%s\nwant:\n%s\n", gotPercent, wantPercent)
	}

	if err := fm.EmitFuncs(&b3); err != nil {
		t.Fatalf("EmitFuncs returned %v", err)
	}
	wantFuncs := strings.TrimSpace(`
p.go:10:	f1		33.3%
q.go:20:	f2		75.0%
total		(statements)	62.5%`)
	gotFuncs := strings.TrimSpace(b3.String())
	if wantFuncs != gotFuncs {
		t.Errorf("emit funcs: got:\n%s\nwant:\n%s\n", gotFuncs, wantFuncs)
	}
	if false {
		t.Logf("text is %s\n", b1.String())
		t.Logf("perc is %s\n", b2.String())
		t.Logf("funcs is %s\n", b3.String())
	}
}