Nothing
context("Hamming distance")
examples_equal_weights <- list(
list(x = "abc", y = "abc", true_dist = 0), # identical
list(x = "plane", y = "plant", true_dist = 1), # substitution
list(x = "color", y = "colour", true_dist = Inf), # unequal length
list(x = "favourite", y = "favorite", true_dist = Inf), # unequal length
list(x = "1234", y = "", true_dist = Inf), # unequal length
list(x = "", y = "1234", true_dist = Inf), # unequal length
list(x = "", y = "", true_dist = 0), # empty
list(x = "positive", y = "evitisop", true_dist = 8), # reverse
list(x = "café", y = "cafe", true_dist = 1), # character with diacritic
list(x = list(c("A", "B", "B", "A")), y = list(c("A", "B", "A", "B")), true_dist = 2)
)
test_that("Hamming distance is correct when weights are equal", {
for (example in examples_equal_weights) {
with(example,
expect_equal(Hamming()(x, y), true_dist))
}
})
examples_normalized <- list(
list(x = "abc", y = "abc", true_dist = 0), # identical
list(x = "plane", y = "plant", true_dist = 1/5), # substitution
list(x = "color", y = "colour", true_dist = 1), # unequal length
list(x = "favourite", y = "favorite", true_dist = 1), # unequal length
list(x = "1234", y = "", true_dist = 1), # unequal length
list(x = "", y = "1234", true_dist = 1), # unequal length
list(x = "", y = "", true_dist = 0), # empty
list(x = "positive", y = "evitisop", true_dist = 1), # reverse
list(x = "café", y = "cafe", true_dist = 1/4), # character with diacritic
list(x = list(c("A", "B", "B", "A")), y = list(c("A", "B", "A", "B")), true_dist = 2/4)
)
test_that("Hamming distance is correct when normalized", {
for (example in examples_normalized) {
with(example,
expect_equal(Hamming(normalize = TRUE)(x, y), true_dist))
}
})
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