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Unit test of

__call() : test missing
coordinate_to_float() : test success (north, west, zero, invalid)
get_city_lat_lng() : test missing
get_city_names() : test missing
index_lat_lng() : test missing
load_cities_lat_lng() : test missing
coordinate_to_float() #north
$args = [
  0 => '51°30\'N',
]
$expected = $returned
$returned = 51.5
coordinate_to_float() #west
$args = [
  0 => '45°00\'W',
]
$expected = $returned
$returned = -45.0
coordinate_to_float() #zero
$args = [
  0 => '0°00\'E/W',
]
$expected = $returned
$returned = 0.0
coordinate_to_float() #invalid
$args = [
  0 => '45°\'E/W',
]
$expected = $returned
$returned = NULL
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