Before:
  let g:loclist = [
  \ {'bufnr': 1, 'lnum': 2, 'col': 10},
  \ {'bufnr': 1, 'lnum': 3, 'col': 2},
  \ {'bufnr': 1, 'lnum': 3, 'col': 10},
  \ {'bufnr': 1, 'lnum': 3, 'col': 12},
  \ {'bufnr': 1, 'lnum': 3, 'col': 25},
  \ {'bufnr': 1, 'lnum': 5, 'col': 4},
  \ {'bufnr': 1, 'lnum': 5, 'col': 5},
  \ {'bufnr': 1, 'lnum': 9, 'col': 5},
  \ {'bufnr': 1, 'lnum': 10, 'col': 1},
  \ {'bufnr': 2, 'lnum': 7, 'col': 10},
  \ {'bufnr': 2, 'lnum': 9, 'col': 2},
  \ {'bufnr': 2, 'lnum': 10, 'col': 2},
  \ {'bufnr': 2, 'lnum': 11, 'col': 2},
  \]

After:
  unlet g:loclist

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

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

Execute(Near column matches should be taken):
  AssertEqual 2, ale#util#BinarySearch(g:loclist, 1, 3, 11)
  AssertEqual 3, ale#util#BinarySearch(g:loclist, 1, 3, 13)

Execute(Columns before should be taken when the cursor is far ahead):
  AssertEqual 4, ale#util#BinarySearch(g:loclist, 1, 3, 300)

Execute(The only problems on lines in later columns should be matched):
  AssertEqual 7, ale#util#BinarySearch(g:loclist, 1, 9, 1)

Execute(The only problems on lines in earlier columns should be matched):
  AssertEqual 8, ale#util#BinarySearch(g:loclist, 1, 10, 30)

Execute(Lines for other buffers should not be matched):
  AssertEqual -1, ale#util#BinarySearch(g:loclist, 1, 7, 10)

Execute(Searches for buffers later in the list should work):
  AssertEqual 10, ale#util#BinarySearch(g:loclist, 2, 9, 10)

Execute(Searches should work with just one item):
  let g:loclist = [{'bufnr': 1, 'lnum': 3, 'col': 10}]

  AssertEqual 0, ale#util#BinarySearch(g:loclist, 1, 3, 2)

Execute(Searches should return the last item on a single column):
  let g:loclist = [
  \ {'bufnr': 1, 'lnum': 1, 'col': 10, 'type': 'W'},
  \ {'bufnr': 1, 'lnum': 1, 'col': 10, 'type': 'E'},
  \ {'bufnr': 1, 'lnum': 1, 'col': 11, 'type': 'W'},
  \ {'bufnr': 1, 'lnum': 1, 'col': 11, 'type': 'E'},
  \ {'bufnr': 1, 'lnum': 1, 'col': 20, 'type': 'W'},
  \ {'bufnr': 1, 'lnum': 1, 'col': 20, 'type': 'E'},
  \]

  " We should return the index for the last item at some column to the right.
  AssertEqual 1, ale#util#BinarySearch(g:loclist, 1, 1, 1)
  " We should return the index for the last item at the column we are on.
  AssertEqual 3, ale#util#BinarySearch(g:loclist, 1, 1, 11)
  " We should prefer items to the left of the cursor, over the right.
  AssertEqual 3, ale#util#BinarySearch(g:loclist, 1, 1, 19)