pkg/subsystem: restructure the package

Remove the entity and match subpackages.

Regenerate the linux.go file.

1 files changed, 40 insertions, 0 deletions

diff --git a/pkg/subsystem/linux/coincidence_test.go b/pkg/subsystem/linux/coincidence_test.go
new file mode 100644
index 000000000..8aaf5ed0a
--- /dev/null
+++ b/pkg/subsystem/linux/coincidence_test.go
@@ -0,0 +1,40 @@
+// 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"
+
+	"github.com/google/syzkaller/pkg/subsystem"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCoincidenceMatrix(t *testing.T) {
+	cm := MakeCoincidenceMatrix()
+	a, b, c := &subsystem.Subsystem{}, &subsystem.Subsystem{}, &subsystem.Subsystem{}
+	cm.Record(a, b)
+	cm.Record(b, c)
+
+	// Test counts.
+	assert.Equal(t, cm.Count(a), 1)
+	assert.Equal(t, cm.Count(b), 2)
+	assert.Equal(t, cm.Count(c), 1)
+
+	// Test pairwise counts.
+	assert.Equal(t, cm.Get(a, b), 1)
+	assert.Equal(t, cm.Get(b, c), 1)
+	assert.Equal(t, cm.Get(a, c), 0)
+
+	// Test the iterator.
+	type pair struct {
+		a *subsystem.Subsystem
+		b *subsystem.Subsystem
+	}
+	expected := []pair{{a, b}, {b, a}, {b, c}, {c, b}}
+	got := []pair{}
+	cm.NonEmptyPairs(func(a, b *subsystem.Subsystem, _ int) {
+		got = append(got, pair{a, b})
+	})
+	assert.ElementsMatch(t, expected, got)
+}