diff --git a/functions/merge_sorted_lists.py b/functions/merge_sorted_lists.py
index bdfb2ba..36f37ab 100644
--- a/functions/merge_sorted_lists.py
+++ b/functions/merge_sorted_lists.py
@@ -1,2 +1,4 @@
 def merge_sorted_lists(l1, l2):
-    pass
+    merged = l1 + l2
+
+    return sorted(merged)
diff --git a/functions/two_sum.py b/functions/two_sum.py
index 0a8adcb..8b263a9 100644
--- a/functions/two_sum.py
+++ b/functions/two_sum.py
@@ -1,2 +1,5 @@
-def twoSum(n, t):
-    pass
+def two_sum(number, t):
+    for i in range(len(number)):
+        for j in range(i + 1, len(number)):
+            if number[j] == t - number[i]:
+                return [i, j]
diff --git a/tests/merge_sorted_lists_test.py b/tests/merge_sorted_lists_test.py
index c0ad62f..cf10428 100644
--- a/tests/merge_sorted_lists_test.py
+++ b/tests/merge_sorted_lists_test.py
@@ -1,2 +1,38 @@
 import pytest
 from functions.merge_sorted_lists import merge_sorted_lists
+
+
+def test_for_1_and_2():
+    # Arrange
+    l1 = [1]
+    l2 = [2]
+
+    # Act
+    answer = merge_sorted_lists(l1, l2)
+
+    # Assert
+    assert answer == [1, 2]
+
+
+def test_for_2_and_1():
+    # Arrange
+    l1 = [2]
+    l2 = [1]
+
+    # Act
+    answer = merge_sorted_lists(l1, l2)
+
+    # Assert
+    assert answer == [1, 2]
+
+
+def test_for_1_2_3_and_4_5_6():
+    # Arrange
+    l1 = [1, 2, 3]
+    l2 = [4, 5, 6]
+
+    # Act
+    answer = merge_sorted_lists(l1, l2)
+
+    # Assert
+    assert answer == [1, 2, 3, 4, 5, 6]
\ No newline at end of file
diff --git a/tests/two_sum_test.py b/tests/two_sum_test.py
index a2724cf..bde067f 100644
--- a/tests/two_sum_test.py
+++ b/tests/two_sum_test.py
@@ -1,2 +1,37 @@
 import pytest
-from functions.two_sum import twoSum
+from functions.two_sum import two_sum
+
+def test_returns_0_1_for_2_7_11_15_with_target_9():
+    # Arrange
+    numbers = [2, 7, 11, 15]
+    t = 9
+
+    # Act
+    answer = two_sum(numbers, t)
+
+    # Assert
+    assert answer == [0, 1]
+
+
+def test_returns_1_2_for_3_2_4_with_target_6():
+    # Arrange
+    numbers = [3, 2, 4]
+    t = 6
+
+    # Act
+    answer = two_sum(numbers, t)
+
+    # Assert
+    assert answer == [1, 2]
+
+
+def test_returns_0_1_for_3_3_with_target_6():
+    # Arrange
+    numbers = [3, 3]
+    t = 6
+
+    # Act
+    answer = two_sum(numbers, t)
+
+    # Assert
+    assert answer == [0, 1]
\ No newline at end of file