Before:
  let g:loclist = [
  \ {'lnum': 2, 'col': 10},
  \ {'lnum': 3, 'col': 2},
  \ {'lnum': 3, 'col': 10},
  \ {'lnum': 3, 'col': 12},
  \ {'lnum': 3, 'col': 25},
  \ {'lnum': 5, 'col': 4},
  \ {'lnum': 5, 'col': 5},
  \]

Execute (Exact column matches should be correct):
   AssertEqual ale#util#BinarySearch(g:loclist, 3, 2), 1

Execute (Off lines, there should be no match):
   AssertEqual ale#util#BinarySearch(g:loclist, 4, 2), -1

Execute (Near column matches should be taken):
   AssertEqual ale#util#BinarySearch(g:loclist, 3, 11), 2
   AssertEqual ale#util#BinarySearch(g:loclist, 3, 13), 4

Execute (Columns before should be taken when the cursor is far ahead):
   AssertEqual ale#util#BinarySearch(g:loclist, 3, 300), 4

After:
  unlet g:loclist