RESULT test:
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Test 1: empty window
[[''], {'chars': 0, 'cursor_chars': 0, 'words': 0, 'cursor_words': 0, 'bytes': 0, 'cursor_bytes': 0}]
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Test 2: some words, cursor at start
[['', 'one two three'], {'chars': 15, 'cursor_chars': 1, 'words': 3, 'cursor_words': 0, 'bytes': 15, 'cursor_bytes': 1}]
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Test 3: some words, cursor at end
[['', 'one two three'], {'chars': 15, 'cursor_chars': 14, 'words': 3, 'cursor_words': 3, 'bytes': 15, 'cursor_bytes': 14}]
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Test 4: some words, cursor at end, ve=all
[['', 'one two three'], {'chars': 15, 'cursor_chars': 15, 'words': 3, 'cursor_words': 3, 'bytes': 15, 'cursor_bytes': 15}]
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Test 5: several lines with words
[['', 'one two three', 'one two three', 'one two three'], {'chars': 43, 'cursor_chars': 42, 'words': 9, 'cursor_words': 9, 'bytes': 43, 'cursor_bytes': 42}]
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Test 6: one line with BOM set
[['', 'one two three'], {'chars': 15, 'cursor_chars': 14, 'words': 3, 'cursor_words': 3, 'bytes': 18, 'cursor_bytes': 14}]
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Test 7: one line with multibyte words
[['', 'Äne M¤ne Müh'], {'chars': 14, 'cursor_chars': 13, 'words': 3, 'cursor_words': 3, 'bytes': 17, 'cursor_bytes': 16}]
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Test 8: several lines with multibyte words
[['', 'Äne M¤ne Müh', 'und raus bist dü!'], {'chars': 32, 'cursor_chars': 31, 'words': 7, 'cursor_words': 7, 'bytes': 36, 'cursor_bytes': 35}]
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Test 9: visual mode, complete buffer
[['', 'Äne M¤ne Müh', 'und raus bist dü!'], {'chars': 32, 'words': 7, 'bytes': 36, 'visual_chars': 32, 'visual_words': 7, 'visual_bytes': 36}]
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Test 10: visual mode (empty)
[['', 'Äne M¤ne Müh', 'und raus bist dü!'], {'chars': 32, 'words': 7, 'bytes': 36, 'visual_chars': 1, 'visual_words': 0, 'visual_bytes': 1}]
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Test 11: visual mode, single line
[['', 'Äne M¤ne Müh', 'und raus bist dü!'], {'chars': 32, 'words': 7, 'bytes': 36, 'visual_chars': 13, 'visual_words': 3, 'visual_bytes': 16}]