1 files changed, 69 insertions, 0 deletions
diff --git a/pkg/sentry/kernel/task_test.go b/pkg/sentry/kernel/task_test.go
new file mode 100644
index 000000000..82ef858a1
--- /dev/null
+++ b/pkg/sentry/kernel/task_test.go
@@ -0,0 +1,69 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kernel
+
+import (
+	"testing"
+
+	"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/sched"
+)
+
+func TestTaskCPU(t *testing.T) {
+	for _, test := range []struct {
+		mask sched.CPUSet
+		tid  ThreadID
+		cpu  int32
+	}{
+		{
+			mask: []byte{0xff},
+			tid:  1,
+			cpu:  0,
+		},
+		{
+			mask: []byte{0xff},
+			tid:  10,
+			cpu:  1,
+		},
+		{
+			// more than 8 cpus.
+			mask: []byte{0xff, 0xff},
+			tid:  10,
+			cpu:  9,
+		},
+		{
+			// missing the first cpu.
+			mask: []byte{0xfe},
+			tid:  1,
+			cpu:  1,
+		},
+		{
+			mask: []byte{0xfe},
+			tid:  10,
+			cpu:  3,
+		},
+		{
+			// missing the fifth cpu.
+			mask: []byte{0xef},
+			tid:  10,
+			cpu:  2,
+		},
+	} {
+		assigned := assignCPU(test.mask, test.tid)
+		if test.cpu != assigned {
+			t.Errorf("assignCPU(%v, %v) got %v, want %v", test.mask, test.tid, assigned, test.cpu)
+		}
+	}
+
+}