run-length-encoder

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

@@ -0,0 +1,59 @@
+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

elixir/run-length-encoding/test/test_helper.exs

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+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true)