exercism/elixir/run-length-encoding/test/run_length_encoder_test.exs

60 lines
1.7 KiB
Elixir

defmodule RunLengthEncoderTest do
use ExUnit.Case
test "encode empty string" do
assert RunLengthEncoder.encode("") === ""
end
test "encode single characters only are encoded without count" do
assert RunLengthEncoder.encode("XYZ") === "XYZ"
end
test "encode string with no single characters" do
assert RunLengthEncoder.encode("AABBBCCCC") == "2A3B4C"
end
test "encode single characters mixed with repeated characters" do
assert RunLengthEncoder.encode("WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWB") ===
"12WB12W3B24WB"
end
test "encode multiple whitespace mixed in string" do
assert RunLengthEncoder.encode(" hsqq qww ") === "2 hs2q q2w2 "
end
test "encode lowercase characters" do
assert RunLengthEncoder.encode("aabbbcccc") === "2a3b4c"
end
test "decode empty string" do
assert RunLengthEncoder.decode("") === ""
end
test "decode single characters only" do
assert RunLengthEncoder.decode("XYZ") === "XYZ"
end
test "decode string with no single characters" do
assert RunLengthEncoder.decode("2A3B4C") == "AABBBCCCC"
end
test "decode single characters with repeated characters" do
assert RunLengthEncoder.decode("12WB12W3B24WB") ===
"WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWB"
end
test "decode multiple whitespace mixed in string" do
assert RunLengthEncoder.decode("2 hs2q q2w2 ") === " hsqq qww "
end
test "decode lower case string" do
assert RunLengthEncoder.decode("2a3b4c") === "aabbbcccc"
end
test "encode followed by decode gives original string" do
original = "zzz ZZ zZ"
encoded = RunLengthEncoder.encode(original)
assert RunLengthEncoder.decode(encoded) === original
end
end