german-sysadmin

elixir/german-sysadmin/test/test_helper.exs

@@ -0,0 +1,2 @@
+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true, seed: 0)

elixir/german-sysadmin/test/username_test.exs

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+defmodule UsernameTest do
+  use ExUnit.Case
+
+  describe "sanitize/1" do
+    @tag task_id: 1
+    test "works for an empty charlist" do
+      assert Username.sanitize(~c"") == ~c""
+    end
+
+    @tag task_id: 1
+    test "it allows lowercase Latin letters" do
+      assert Username.sanitize(~c"anne") == ~c"anne"
+    end
+
+    @tag task_id: 1
+    test "it allows the whole lowercase Latin alphabet" do
+      lowercase_latin_letters = ~c"abcdefghijklmnopqrstuvwxyz"
+
+      assert Username.sanitize(lowercase_latin_letters) == lowercase_latin_letters
+    end
+
+    @tag task_id: 1
+    test "it removes numbers" do
+      assert Username.sanitize(~c"schmidt1985") == ~c"schmidt"
+    end
+
+    @tag task_id: 1
+    test "it removes punctuation" do
+      assert Username.sanitize(~c"*fritz*!$%") == ~c"fritz"
+    end
+
+    @tag task_id: 1
+    test "it removes whitespace" do
+      assert Username.sanitize(~c" olaf ") == ~c"olaf"
+    end
+
+    @tag task_id: 1
+    test "it removes all disallowed characters" do
+      allowed_characters = ~c"abcdefghijklmnopqrstuvwxyz_ßäöü"
+      input = Enum.to_list(0..0x10FFFF) -- allowed_characters
+
+      assert Username.sanitize(input) == ~c""
+    end
+
+    @tag task_id: 2
+    test "it allows underscores" do
+      assert Username.sanitize(~c"marcel_huber") == ~c"marcel_huber"
+    end
+
+    @tag task_id: 3
+    test "it substitutes German letters" do
+      assert Username.sanitize(~c"krüger") == ~c"krueger"
+      assert Username.sanitize(~c"köhler") == ~c"koehler"
+      assert Username.sanitize(~c"jäger") == ~c"jaeger"
+      assert Username.sanitize(~c"groß") == ~c"gross"
+    end
+
+    @tag task_id: 3
+    test "it substitutes German letters and removes disallowed characters" do
+      assert Username.sanitize(~c"köhler_jäger42") == ~c"koehler_jaeger"
+    end
+  end
+end