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// Copyright 2023 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package linux
import (
"testing"
"testing/fstest"
"github.com/google/syzkaller/pkg/subsystem"
"github.com/stretchr/testify/assert"
)
func TestBuildCoincidenceMatrix(t *testing.T) {
vfs := &subsystem.Subsystem{PathRules: []subsystem.PathRule{
{IncludeRegexp: `^fs/`},
}}
ext4 := &subsystem.Subsystem{PathRules: []subsystem.PathRule{
{IncludeRegexp: `^fs/ext4/`},
}}
ntfs := &subsystem.Subsystem{PathRules: []subsystem.PathRule{
{IncludeRegexp: `^fs/ntfs/`},
}}
kernel := &subsystem.Subsystem{PathRules: []subsystem.PathRule{
{IncludeRegexp: `.*`},
}}
fs := fstest.MapFS{
".git/obj/12345": {},
"fs/inode.c": {},
"fs/ext4/file.c": {},
"fs/ntfs/file.c": {},
"fs/fat/file.c": {},
"net/socket.c": {},
}
matrix, _, err := BuildCoincidenceMatrix(fs, []*subsystem.Subsystem{vfs, ntfs, ext4, kernel}, nil)
assert.NoError(t, err)
// Test total counts.
assert.Equal(t, 5, matrix.Count(kernel))
assert.Equal(t, 4, matrix.Count(vfs))
assert.Equal(t, 1, matrix.Count(ext4))
// Test pairwise counts.
assert.Equal(t, 1, matrix.Get(vfs, ext4))
assert.Equal(t, 1, matrix.Get(vfs, ntfs))
assert.Equal(t, 0, matrix.Get(ext4, ntfs))
assert.Equal(t, 4, matrix.Get(kernel, vfs))
}
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