diff --git a/src/rgb_to_hex.py b/src/rgb_to_hex.py
new file mode 100644
index 00000000..302ea50b
--- /dev/null
+++ b/src/rgb_to_hex.py
@@ -0,0 +1,24 @@
+def rgb_to_hex(r: int, g: int, b: int) -> str:
+    """
+    Convert RGB color values to a hex color code.
+
+    Args:
+        r (int): Red color value (0-255)
+        g (int): Green color value (0-255)
+        b (int): Blue color value (0-255)
+
+    Returns:
+        str: Hex color code (e.g., '#FF0000' for pure red)
+
+    Raises:
+        ValueError: If any color value is outside the range 0-255
+    """
+    # Validate input ranges
+    for color, name in [(r, 'Red'), (g, 'Green'), (b, 'Blue')]:
+        if not isinstance(color, int):
+            raise TypeError(f"{name} must be an integer")
+        if color < 0 or color > 255:
+            raise ValueError(f"{name} must be between 0 and 255")
+    
+    # Convert to hex and pad with zeros if needed
+    return f'#{r:02X}{g:02X}{b:02X}'
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diff --git a/tests/test_rgb_to_hex.py b/tests/test_rgb_to_hex.py
new file mode 100644
index 00000000..38c0fdb5
--- /dev/null
+++ b/tests/test_rgb_to_hex.py
@@ -0,0 +1,44 @@
+import pytest
+from src.rgb_to_hex import rgb_to_hex
+
+def test_basic_conversion():
+    """Test standard RGB to hex conversion"""
+    assert rgb_to_hex(255, 0, 0) == '#FF0000'  # Red
+    assert rgb_to_hex(0, 255, 0) == '#00FF00'  # Green
+    assert rgb_to_hex(0, 0, 255) == '#0000FF'  # Blue
+    assert rgb_to_hex(128, 128, 128) == '#808080'  # Gray
+
+def test_zero_values():
+    """Test conversion with zero values"""
+    assert rgb_to_hex(0, 0, 0) == '#000000'  # Black
+
+def test_padding():
+    """Test that single-digit hex values are padded"""
+    assert rgb_to_hex(1, 2, 3) == '#010203'
+
+def test_invalid_inputs():
+    """Test error handling for invalid inputs"""
+    # Values below 0
+    with pytest.raises(ValueError, match="must be between 0 and 255"):
+        rgb_to_hex(-1, 0, 0)
+    with pytest.raises(ValueError, match="must be between 0 and 255"):
+        rgb_to_hex(0, -1, 0)
+    with pytest.raises(ValueError, match="must be between 0 and 255"):
+        rgb_to_hex(0, 0, -1)
+
+    # Values above 255
+    with pytest.raises(ValueError, match="must be between 0 and 255"):
+        rgb_to_hex(256, 0, 0)
+    with pytest.raises(ValueError, match="must be between 0 and 255"):
+        rgb_to_hex(0, 256, 0)
+    with pytest.raises(ValueError, match="must be between 0 and 255"):
+        rgb_to_hex(0, 0, 256)
+
+def test_type_errors():
+    """Test error handling for incorrect input types"""
+    with pytest.raises(TypeError, match="Red must be an integer"):
+        rgb_to_hex('255', 0, 0)
+    with pytest.raises(TypeError, match="Green must be an integer"):
+        rgb_to_hex(0, '255', 0)
+    with pytest.raises(TypeError, match="Blue must be an integer"):
+        rgb_to_hex(0, 0, '255')
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