test(hypervisors): add unit tests for bytesToMiB and bytesToMB

Adds table-driven tests for the two byte-conversion helpers in
pkg/unikontainers/hypervisors/utils.go, using testify/assert. Each
helper is covered for zero, sub-unit, exact-unit, multiple, and
large-value inputs.

PR: #584
Signed-off-by: Parth Dagia <parth.24bcs10414@sst.scaler.com>
Reviewed-by: Charalampos Mainas <cmainas@nubificus.co.uk>
Approved-by: Charalampos Mainas <cmainas@nubificus.co.uk>

Author: parthdagia05

pkg/unikontainers/hypervisors/utils_test.go

@@ -0,0 +1,73 @@
+// Copyright (c) 2023-2026, Nubificus LTD
+//
+// 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 hypervisors
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBytesToMiB(t *testing.T) {
+	t.Parallel()
+
+	const mib uint64 = 1024 * 1024
+
+	cases := []struct {
+		name     string
+		input    uint64
+		expected uint64
+	}{
+		{"zero", 0, 0},
+		{"less than one MiB truncates to zero", mib - 1, 0},
+		{"exactly one MiB", mib, 1},
+		{"exactly two MiB", 2 * mib, 2},
+		{"non-multiple truncates down", mib + (mib / 2), 1},
+		{"large value", 1024 * mib, 1024},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			assert.Equal(t, tc.expected, bytesToMiB(tc.input))
+		})
+	}
+}
+
+func TestBytesToMB(t *testing.T) {
+	t.Parallel()
+
+	const mb uint64 = 1000 * 1000
+
+	cases := []struct {
+		name     string
+		input    uint64
+		expected uint64
+	}{
+		{"zero", 0, 0},
+		{"less than one MB truncates to zero", mb - 1, 0},
+		{"exactly one MB", mb, 1},
+		{"exactly two MB", 2 * mb, 2},
+		{"non-multiple truncates down", mb + (mb / 2), 1},
+		{"large value", 1024 * mb, 1024},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			assert.Equal(t, tc.expected, bytesToMB(tc.input))
+		})
+	}
+}