From 71559a48afc860d124b4ddfeb8df752b22a25053 Mon Sep 17 00:00:00 2001
From: Runxi Yu <me@runxiyu.org>
Date: Sun, 23 Mar 2025 12:01:36 +0800
Subject: Separate validateBitZeros into a separate file

---
 bitwise_test.go | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 bitwise_test.go

(limited to 'bitwise_test.go')

diff --git a/bitwise_test.go b/bitwise_test.go
new file mode 100644
index 0000000..394d407
--- /dev/null
+++ b/bitwise_test.go
@@ -0,0 +1,90 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestValidateBitZeros(t *testing.T) {
+	tests := []struct {
+		name     string
+		bs       []byte
+		n        uint
+		expected bool
+	}{
+		{
+			name:     "First 8 bits are zeros",
+			bs:       []byte{0x00, 0x01},
+			n:        8,
+			expected: true,
+		},
+		{
+			name:     "First 8 bits are not all zeros",
+			bs:       []byte{0x01, 0x00},
+			n:        8,
+			expected: false,
+		},
+		{
+			name:     "First 16 bits are zeros",
+			bs:       []byte{0x00, 0x00, 0x01},
+			n:        16,
+			expected: true,
+		},
+		{
+			name:     "First 16 bits are not all zeros",
+			bs:       []byte{0x01, 0x00, 0x00},
+			n:        16,
+			expected: false,
+		},
+		{
+			name:     "First 9 bits are zeros",
+			bs:       []byte{0x00, 0x01},
+			n:        9,
+			expected: true,
+		},
+		{
+			name:     "First 9 bits are not all zeros",
+			bs:       []byte{0x01, 0x01},
+			n:        9,
+			expected: false,
+		},
+		{
+			name:     "First 10 bits are zeros",
+			bs:       []byte{0x00, 0x20},
+			n:        10,
+			expected: true,
+		},
+		{
+			name:     "First 10 bits are not all zeros",
+			bs:       []byte{0x00, 0x40},
+			n:        10,
+			expected: false,
+		},
+		{
+			name:     "First 24 bits are zeros",
+			bs:       []byte{0x00, 0x00, 0x00, 0x01},
+			n:        24,
+			expected: true,
+		},
+		{
+			name:     "First 24 bits are not all zeros",
+			bs:       []byte{0x00, 0x01, 0x00, 0x00},
+			n:        24,
+			expected: false,
+		},
+		{
+			name:     "Checking zero bits",
+			bs:       []byte{0xFF, 0xFF},
+			n:        0,
+			expected: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := validateBitZeros(tt.bs, tt.n)
+			if got != tt.expected {
+				t.Errorf("validateBitZeros(%v, %v) = %v; want %v", tt.bs, tt.n, got, tt.expected)
+			}
+		})
+	}
+}
-- 
cgit v1.2.3