initial

test/argon2_test.exs

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+defmodule Argon2Test do
+  use ExUnit.Case
+  doctest Argon2
+
+  describe "hash_password/1" do
+    test "hashes a password with default OWASP config" do
+      hash = Argon2.hash_password("password123")
+      assert is_binary(hash)
+      assert String.starts_with?(hash, "$argon2i$v=19$m=19456,t=2,p=1$")
+    end
+
+    test "hashes a password with strong config" do
+      config = "strong"
+      hash = Argon2.hash_password("password123", config)
+      assert is_binary(hash)
+      assert String.starts_with?(hash, "$argon2i$v=19$m=65540,t=3,p=4$")
+    end
+
+    test "hashes a password with test/development config" do
+      config = "test_unsafe"
+      hash = Argon2.hash_password("password123", config)
+      assert is_binary(hash)
+      assert String.starts_with?(hash, "$argon2i$v=19$m=1024,t=1,p=1")
+    end
+
+    test "generates different hashes for the same password" do
+      hash1 = Argon2.hash_password("same_password123")
+      hash2 = Argon2.hash_password("same_password123")
+      refute hash1 == hash2
+    end
+
+    test "rejects passwords shorter than 8 characters" do
+      assert_raise ArgumentError, "Password must be at least 8 characters long", fn ->
+        Argon2.hash_password("short")
+      end
+    end
+
+    test "accepts passwords exactly 8 characters" do
+      hash = Argon2.hash_password("abcdefgh")
+      assert is_binary(hash)
+    end
+  end
+
+  describe "verify_password/2" do
+    test "verifies a correct password" do
+      password = "correct_password123"
+      hash = Argon2.hash_password(password)
+      assert Argon2.verify_password(password, hash)
+    end
+
+    test "rejects an incorrect password" do
+      password = "correct_password123"
+      wrong_password = "wrong_password123"
+      hash = Argon2.hash_password(password)
+      refute Argon2.verify_password(wrong_password, hash)
+    end
+
+    test "handles invalid hash format" do
+      assert_raise ArgumentError, fn ->
+        Argon2.verify_password("password123", "invalid_hash_format")
+      end
+    end
+
+    test "rejects verification of short passwords" do
+      assert_raise ArgumentError, "Password must be at least 8 characters long", fn ->
+        Argon2.verify_password("short", "$argon2i$v=19$m=65536,t=2,p=4$c29tZXNhbHQ$hash")
+      end
+    end
+  end
+
+  describe "edge cases" do
+    test "handles unicode passwords of sufficient length" do
+      password = "パスワード123456"
+      hash = Argon2.hash_password(password)
+      assert Argon2.verify_password(password, hash)
+    end
+
+    test "handles emoji passwords" do
+      password = "🏳️‍⚧️🏳️‍⚧️🏳️‍⚧️🏳️‍⚧️🏳️‍⚧️🏳️‍⚧️"
+      hash = Argon2.hash_password(password)
+      assert Argon2.verify_password(password, hash)
+    end
+
+    test "handles very long passwords" do
+      long_password = String.duplicate("a", 1000)
+      hash = Argon2.hash_password(long_password)
+      assert Argon2.verify_password(long_password, hash)
+    end
+  end
+end

test/test_helper.exs

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+ExUnit.start()