数独游戏开发：如何测试读取二进制文件初始化的代码

Great question! Testing binary file parsing code can feel tricky at first, but breaking it down into simple steps makes it straightforward. Here's how to do it effectively for your Sudoku game:

Step 1: Manually Create a Test Binary File #

First, you need a binary file that follows your 3-byte record format (row byte → column byte → number byte). Based on your example (069 = row 1, column 7, number 9), it looks like each byte is an ASCII character representing a digit (so 0 as a byte maps to row 1, 6 maps to column 7, etc.). Here are three easy ways to build your test file:

Option 1: Text Editor + Binary Save (Quick & Visual) #

• Open a plain text editor (Notepad++, VS Code, etc.) and type test records as 3-character groups. For example:

  069
  123
  888
  005
  

  This creates 4 valid records:
  • 069: Row 1, Column 7, Number 9 (your example)
  • 123: Row 2, Column 3, Number 3
  • 888: Row 9, Column 9, Number 8
  • 005: Row 1, Column 1, Number 5
• Save the file as a binary:
  • In Notepad++: Go to Encoding > ANSI, then save as test_sudoku.bin
  • In VS Code: Set the bottom-right encoding to windows-1252 or ISO-8859-1, then save with the .bin extension. This ensures each character is stored as a single byte.

Option 2: Command Line (Fast for Simple Cases) #

Use terminal commands to write directly to a binary file (avoids accidental newlines):

• Linux/macOS:

  printf '069123888005' > test_sudoku.bin
  

  This writes the string as raw bytes, with each character taking 1 byte (perfect for your 3-byte records).
• Windows Command Prompt:

  echo | set /p="069123888005" > test_sudoku.bin
  

  The set /p trick prevents extra newlines from being added to the file.

Option 3: Scripted Generation (Flexible for Complex Tests) #

Use a quick Python script to generate precise test cases (great for edge cases):

# Define test records as (row_char, column_char, number_char)
test_records = [
    ('0', '6', '9'),  # Your example record
    ('0', '0', '5'),  # Top-left corner: row 1, col 1, num 5
    ('8', '8', '1'),  # Bottom-right corner: row9, col9, num1
    ('4', '4', '7'),  # Center cell: row5, col5, num7
    ('2', '5', '4'),  # Random middle cell
]

# Write to binary file
with open('test_sudoku.bin', 'wb') as f:
    for row, col, num in test_records:
        # Encode each character to ASCII bytes and write
        f.write(row.encode('ascii'))
        f.write(col.encode('ascii'))
        f.write(num.encode('ascii'))

Run this script, and you'll get a perfectly formatted binary file with exactly the records you need.

Step 2: Design Test Cases to Cover All Scenarios #

Make sure to test both normal and edge cases to ensure your code is robust:

• Valid Normal Cases: Middle rows/columns, random valid digits (1-9)
• Edge Cases:
  • Row bytes 0 (row 1) and 8 (row9)
  • Column bytes 0 (col1) and 8 (col9)
  • Digits from 1 to 9 (all valid Sudoku numbers)
• Error Cases (if your code handles validation):
  • Non-digit bytes (e.g., A, ! instead of a number)
  • File lengths that aren't multiples of 3 (e.g., 7 bytes total—2 full records + 1 extra byte)
  • Digit byte 0 (invalid in Sudoku)

Step 3: Verify Your Code's Output #

After running your Sudoku reader code, check these key points:

1. All Records Are Read: Count the number of parsed records—should match the number you added to the test file.
2. Correct Parsing: Double-check that each record maps to the right cell:
   • For 069, confirm row 1, column7 has the number9 (adjust for 0-based vs 1-based indexing in your code)
   • For 888, confirm row9, column9 has number8
3. Board Population: Print out the full 9x9 Sudoku board and visually inspect that the numbers are in the correct positions.
4. Error Handling: If your code is supposed to handle invalid input, test those cases (e.g., a file with a non-digit byte) and confirm it behaves as expected (throws an error, skips the bad record, etc.).

Step 4: Validate the Binary File (Optional but Useful) #

If you want to confirm your test file is correctly formatted, use a hex editor (like HxD or 010 Editor) to open test_sudoku.bin. You'll see:

• The character 0 is hex 30, 6 is 36, 9 is 39—so your example record will show as 30 36 39 in hex. This lets you verify the file has exactly the bytes you intended.

That's all! By following these steps, you can thoroughly test your binary file reading code and be confident it works for your Sudoku game.

内容的提问来源于stack exchange，提问作者Alexandros