diff --git a/.github/workflows/ci-checks.yml b/.github/workflows/ci-checks.yml
index b3d7b0052..7f11e8725 100644
--- a/.github/workflows/ci-checks.yml
+++ b/.github/workflows/ci-checks.yml
@@ -51,30 +51,33 @@ jobs:
         run: "pylint solutions tests  || echo '::warning title=Pylint Error(s)::Discuss solutions and trade-offs in code review.'"
         shell: bash
 
-  py_tests:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      
-      - name: python version
-        run: python --version
-        shell: bash
-      
-      - name: Check for test files
-        id: check_tests
-        run: |
-          test_files=$(find ./solutions/tests -type f -name "test_*.py")
-          if [ -n "$test_files" ]; then
-            echo "Found test files:"
-            echo "$test_files"
-            echo "has_tests=true" >> $GITHUB_OUTPUT
-          else
-            echo "No test files found matching pattern ./solutions/tests/test_*.py"
-            echo "has_tests=false" >> $GITHUB_OUTPUT
-          fi
-        shell: bash
-      
-      - name: Python - Run Tests
-        if: steps.check_tests.outputs.has_tests == 'true'
-        run: python -m unittest
-        shell: bash
+ py_tests:
+  runs-on: ubuntu-latest
+  steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    
+    - name: Set up Python
+      run: python --version
+      shell: bash
+    
+    - name: Check for test files
+      id: check_tests
+      run: |
+        test_files=$(find ./solutions/tests -type f -name "test_*.py")
+        if [ -n "$test_files" ]; then
+          echo "Found test files:"
+          echo "$test_files"
+          echo "has_tests=true" >> $GITHUB_ENV
+        else
+          echo "No test files found matching pattern ./solutions/tests/test_*.py"
+          echo "has_tests=false" >> $GITHUB_ENV
+        fi
+      shell: bash
+    
+    - name: Python - Run Tests
+      if: env.has_tests == 'true'
+      env:
+        PYTHONPATH: ${{ github.workspace }}  
+      run: python -m unittest discover -s solutions/tests
+      shell: bash
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 252022b48..d40e712be 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -122,5 +122,8 @@
       "source.fixAll.ruff": "explicit",
       "source.organizeImports.ruff": "explicit"
     }
-  }
+  },
+  "python.testing.unittestArgs": ["-v", "-s", "./solutions", "-p", "test_*.py"],
+  "python.testing.pytestEnabled": false,
+  "python.testing.unittestEnabled": true
 }
diff --git a/solutions/multiply.py b/solutions/multiply.py
new file mode 100644
index 000000000..d8a224fd9
--- /dev/null
+++ b/solutions/multiply.py
@@ -0,0 +1,33 @@
+"""
+multiply.py
+
+This module provides a function to multiply two numbers.
+"""
+
+
+def multiply(a: float, b: float) -> float:
+    """
+    Multiplies two numbers and returns the result.
+
+    Args:
+        a (float): The first number.
+        b (float): The second number.
+
+    Returns:
+        float: The product of a and b.
+
+    Raises:
+        TypeError: If the inputs are not numbers.
+
+    Examples:
+        >>> multiply(2, 3)
+        6
+        >>> multiply(5.5, 2)
+        11.0
+        >>> multiply(-4, 3)
+        -12
+    """
+    if not isinstance(a, (int, float)) or not isinstance(b, (int, float)):
+        raise TypeError("Both inputs must be numbers.")
+
+    return a * b
diff --git a/solutions/sum_positive_numbers.py b/solutions/sum_positive_numbers.py
new file mode 100644
index 000000000..5f4482c28
--- /dev/null
+++ b/solutions/sum_positive_numbers.py
@@ -0,0 +1,39 @@
+"""
+sum_positive_numbers.py
+
+This module provides a function to sum only the positive numbers in a list.
+"""
+
+from typing import List
+
+
+def sum_positive_numbers(numbers: List[float]) -> float:
+    """
+    Calculate the sum of positive numbers in a given list.
+
+    Args:
+        numbers (List[float]): A list of floating point or integer numbers.
+
+    Returns:
+        float: The sum of all positive numbers in the list. If no positive numbers, returns 0.
+
+    Raises:
+        TypeError: If the input is not a list.
+        ValueError: If any element in the list is not a number.
+
+    Examples:
+        >>> sum_positive_numbers([1, -2, 3.5, 0, -1])
+        4.5
+        >>> sum_positive_numbers([-10, -20, -30])
+        0
+        >>> sum_positive_numbers([5, 10, 15])
+        30
+    """
+    if not isinstance(numbers, list):
+        raise TypeError("Input must be a list.")
+
+    for num in numbers:
+        if not isinstance(num, (int, float)):
+            raise ValueError("All elements in the list must be numbers.")
+
+    return sum(num for num in numbers if num > 0)
diff --git a/solutions/tests/test_multiply.py b/solutions/tests/test_multiply.py
new file mode 100644
index 000000000..276e4ede3
--- /dev/null
+++ b/solutions/tests/test_multiply.py
@@ -0,0 +1,37 @@
+"""
+test_multiply.py
+
+Unit tests for the multiply function.
+"""
+
+import unittest
+from solutions.multiply import multiply
+
+
+class TestMultiply(unittest.TestCase):
+    """Tests for multiply function."""
+
+    def test_positive_numbers(self):
+        """Should return the product of two positive numbers."""
+        self.assertEqual(multiply(2, 3), 6)
+
+    def test_negative_numbers(self):
+        """Should return the correct product for negative numbers."""
+        self.assertEqual(multiply(-4, 3), -12)
+
+
+    def test_zero(self):
+        """Should return 0 if either number is 0."""
+        self.assertEqual(multiply(3, 0), 0)
+
+    def test_floats(self):
+        """Should correctly multiply floating point numbers."""
+        self.assertEqual(multiply(2.5, 2), 5.0)
+
+    def test_invalid_input_type(self):
+        """Should raise TypeError if inputs are not numbers."""
+        with self.assertRaises(TypeError):
+            multiply("2", 3)
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/solutions/tests/test_sum_positive_numbers.py b/solutions/tests/test_sum_positive_numbers.py
new file mode 100644
index 000000000..7a66238e0
--- /dev/null
+++ b/solutions/tests/test_sum_positive_numbers.py
@@ -0,0 +1,42 @@
+"""
+test_sum_positive_numbers.py
+
+Unit tests for the sum_positive_numbers function.
+"""
+
+import unittest
+from solutions.sum_positive_numbers import sum_positive_numbers
+
+
+class TestSumPositiveNumbers(unittest.TestCase):
+    """Tests for sum_positive_numbers function."""
+
+    def test_positive_numbers(self):
+        """Should return the sum of positive numbers."""
+        self.assertEqual(sum_positive_numbers([1, 2, 3]), 6)
+
+    def test_mixed_numbers(self):
+        """Should sum only positive numbers and ignore negatives."""
+        self.assertEqual(sum_positive_numbers([1, -2, 3.5, 0, -1]), 4.5)
+
+    def test_all_negative_numbers(self):
+        """Should return 0 if there are no positive numbers."""
+        self.assertEqual(sum_positive_numbers([-10, -20, -30]), 0)
+
+    def test_empty_list(self):
+        """Should return 0 for an empty list."""
+        self.assertEqual(sum_positive_numbers([]), 0)
+
+    def test_invalid_input_type(self):
+        """Should raise TypeError for non-list input."""
+        with self.assertRaises(TypeError):
+            sum_positive_numbers("invalid")
+
+    def test_non_numeric_elements(self):
+        """Should raise ValueError if list contains non-numeric elements."""
+        with self.assertRaises(ValueError):
+            sum_positive_numbers([1, 2, "three"])
+
+
+if __name__ == "__main__":
+    unittest.main()