1 files changed, 91 insertions, 0 deletions
diff --git a/runsc/sandbox/memory_test.go b/runsc/sandbox/memory_test.go
new file mode 100644
index 000000000..81dc67881
--- /dev/null
+++ b/runsc/sandbox/memory_test.go
@@ -0,0 +1,91 @@
+// Copyright 2021 The gVisor Authors.
+//
+// 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 sandbox
+
+import (
+	"bytes"
+	"fmt"
+	"math"
+	"strings"
+	"testing"
+)
+
+func TestTotalSystemMemory(t *testing.T) {
+	for _, tc := range []struct {
+		name    string
+		content string
+		want    uint64
+		err     string
+	}{
+		{
+			name:    "simple",
+			content: "MemTotal: 123\n",
+			want:    123,
+		},
+		{
+			name:    "kb",
+			content: "MemTotal: 123 kB\n",
+			want:    123 * 1024,
+		},
+		{
+			name:    "multi-line",
+			content: "Something: 123\nMemTotal: 456\nAnotherThing: 789\n",
+			want:    456,
+		},
+		{
+			name:    "not-found",
+			content: "Something: 123 kB\nAnotherThing: 789 kB\n",
+			err:     "not found",
+		},
+		{
+			name:    "no-number",
+			content: "MemTotal: \n",
+			err:     "malformed",
+		},
+		{
+			name:    "only-unit",
+			content: "MemTotal: kB\n",
+			err:     "invalid syntax",
+		},
+		{
+			name:    "negative",
+			content: "MemTotal: -1\n",
+			err:     "invalid syntax",
+		},
+		{
+			name:    "overflow",
+			content: fmt.Sprintf("MemTotal: %d kB\n", uint64(math.MaxUint64)),
+			err:     "too large",
+		},
+		{
+			name:    "unkown-unit",
+			content: "MemTotal: 123 mB\n",
+			err:     "unknown unit",
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			mem, err := parseTotalSystemMemory(bytes.NewReader([]byte(tc.content)))
+			if len(tc.err) > 0 {
+				if err == nil || !strings.Contains(err.Error(), tc.err) {
+					t.Errorf("parseTotalSystemMemory(%q) invalid error: %v, want: %v", tc.content, err, tc.err)
+				}
+			} else {
+				if tc.want != mem {
+					t.Errorf("parseTotalSystemMemory(%q) got: %v, want: %v", tc.content, mem, tc.want)
+				}
+			}
+		})
+	}
+}