diff options
Diffstat (limited to 'src/internal/coverage/cmerge/merge_test.go')
-rw-r--r-- | src/internal/coverage/cmerge/merge_test.go | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/internal/coverage/cmerge/merge_test.go b/src/internal/coverage/cmerge/merge_test.go new file mode 100644 index 0000000..e45589f --- /dev/null +++ b/src/internal/coverage/cmerge/merge_test.go @@ -0,0 +1,105 @@ +// 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 cmerge_test + +import ( + "fmt" + "internal/coverage" + "internal/coverage/cmerge" + "testing" +) + +func TestClash(t *testing.T) { + m := &cmerge.Merger{} + err := m.SetModeAndGranularity("mdf1.data", coverage.CtrModeSet, coverage.CtrGranularityPerBlock) + if err != nil { + t.Fatalf("unexpected clash") + } + err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeSet, coverage.CtrGranularityPerBlock) + if err != nil { + t.Fatalf("unexpected clash") + } + err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeCount, coverage.CtrGranularityPerBlock) + if err == nil { + t.Fatalf("expected mode clash, not found") + } + err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeSet, coverage.CtrGranularityPerFunc) + if err == nil { + t.Fatalf("expected granularity clash, not found") + } + m.ResetModeAndGranularity() + err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeCount, coverage.CtrGranularityPerFunc) + if err != nil { + t.Fatalf("unexpected clash after reset") + } +} + +func TestBasic(t *testing.T) { + scenarios := []struct { + cmode coverage.CounterMode + cgran coverage.CounterGranularity + src, dst, res []uint32 + iters int + merr bool + overflow bool + }{ + { + cmode: coverage.CtrModeSet, + cgran: coverage.CtrGranularityPerBlock, + src: []uint32{1, 0, 1}, + dst: []uint32{1, 1, 0}, + res: []uint32{1, 1, 1}, + iters: 2, + overflow: false, + }, + { + cmode: coverage.CtrModeCount, + cgran: coverage.CtrGranularityPerBlock, + src: []uint32{1, 0, 3}, + dst: []uint32{5, 7, 0}, + res: []uint32{6, 7, 3}, + iters: 1, + overflow: false, + }, + { + cmode: coverage.CtrModeCount, + cgran: coverage.CtrGranularityPerBlock, + src: []uint32{4294967200, 0, 3}, + dst: []uint32{4294967001, 7, 0}, + res: []uint32{4294967295, 7, 3}, + iters: 1, + overflow: true, + }, + } + + for k, scenario := range scenarios { + var err error + var ovf bool + m := &cmerge.Merger{} + mdf := fmt.Sprintf("file%d", k) + err = m.SetModeAndGranularity(mdf, scenario.cmode, scenario.cgran) + if err != nil { + t.Fatalf("case %d SetModeAndGranularity failed: %v", k, err) + } + for i := 0; i < scenario.iters; i++ { + err, ovf = m.MergeCounters(scenario.dst, scenario.src) + if ovf != scenario.overflow { + t.Fatalf("case %d overflow mismatch: got %v want %v", k, ovf, scenario.overflow) + } + if !scenario.merr && err != nil { + t.Fatalf("case %d unexpected err %v", k, err) + } + if scenario.merr && err == nil { + t.Fatalf("case %d expected err, not received", k) + } + for i := range scenario.dst { + if scenario.dst[i] != scenario.res[i] { + t.Fatalf("case %d: bad merge at %d got %d want %d", + k, i, scenario.dst[i], scenario.res[i]) + } + } + } + } +} |