diff --git a/src/banks/filters/image.py b/src/banks/filters/image.py
index 81ea7cd..6482bdb 100644
--- a/src/banks/filters/image.py
+++ b/src/banks/filters/image.py
@@ -8,11 +8,8 @@
 
 
 def _is_url(string: str) -> bool:
-    try:
-        result = urlparse(string)
-        return all([result.scheme, result.netloc])
-    except ValueError:
-        return False
+    result = urlparse(string)
+    return all([result.scheme, result.netloc])
 
 
 def image(value: str) -> str:
diff --git a/tests/test_image.py b/tests/test_image.py
new file mode 100644
index 0000000..29a8151
--- /dev/null
+++ b/tests/test_image.py
@@ -0,0 +1,92 @@
+import json
+from pathlib import Path
+
+import pytest
+
+from banks.filters.image import _is_url, image
+
+
+def test_is_url():
+    """Test the internal URL validation function"""
+    assert _is_url("https://example.com/image.jpg") is True
+    assert _is_url("http://example.com/image.jpg") is True
+    assert _is_url("ftp://example.com/image.jpg") is True
+    assert _is_url("not_a_url.jpg") is False
+    assert _is_url("/path/to/image.jpg") is False
+    assert _is_url("relative/path/image.jpg") is False
+    assert _is_url("") is False
+    assert _is_url("https:\\example.com/image.jpg") is False
+
+
+def test_image_with_url():
+    """Test image filter with a URL input"""
+    url = "https://example.com/image.jpg"
+    result = image(url)
+
+    # Verify the content block wrapper
+    assert result.startswith("<content_block>")
+    assert result.endswith("</content_block>")
+
+    # Parse the JSON content
+    json_content = result[15:-16]  # Remove wrapper tags
+    content_block = json.loads(json_content)
+
+    assert content_block["type"] == "image_url"
+    assert content_block["image_url"]["url"] == url
+
+
+def test_image_with_file_path(tmp_path):
+    """Test image filter with a file path input"""
+    # Create a temporary test image file
+    test_image = tmp_path / "test_image.jpg"
+    test_content = b"fake image content"
+    test_image.write_bytes(test_content)
+
+    result = image(str(test_image))
+
+    # Verify the content block wrapper
+    assert result.startswith("<content_block>")
+    assert result.endswith("</content_block>")
+
+    # Parse the JSON content
+    json_content = result[15:-16]  # Remove wrapper tags
+    content_block = json.loads(json_content)
+
+    assert content_block["type"] == "image_url"
+    assert content_block["image_url"]["url"].startswith("data:image/jpeg;base64,")
+
+
+def test_image_with_nonexistent_file():
+    """Test image filter with a nonexistent file path"""
+    with pytest.raises(FileNotFoundError):
+        image("nonexistent/image.jpg")
+
+
+def test_image_content_block_structure():
+    """Test the structure of the generated content block"""
+    url = "https://example.com/image.jpg"
+    result = image(url)
+
+    json_content = result[15:-16]  # Remove wrapper tags
+    content_block = json.loads(json_content)
+
+    # Verify the content block has all expected fields
+    assert set(content_block.keys()) >= {"type", "image_url"}
+    assert content_block["type"] == "image_url"
+    assert isinstance(content_block["image_url"], dict)
+    assert "url" in content_block["image_url"]
+
+
+@pytest.mark.parametrize(
+    "invalid_input",
+    [
+        "",  # empty string
+        None,  # None value
+        123,  # non-string number
+        True,  # boolean
+    ],
+)
+def test_image_with_invalid_input(invalid_input):
+    """Test image filter with various invalid inputs"""
+    with pytest.raises((IsADirectoryError, ValueError, AttributeError, TypeError)):
+        image(invalid_input)
diff --git a/tests/test_types.py b/tests/test_types.py
new file mode 100644
index 0000000..71a9a4e
--- /dev/null
+++ b/tests/test_types.py
@@ -0,0 +1,41 @@
+import base64
+from pathlib import Path
+
+import pytest
+
+from banks.types import ImageUrl
+
+
+def test_image_url_from_base64():
+    """Test creating ImageUrl from base64 encoded data"""
+    test_data = "Hello, World!"
+    base64_data = base64.b64encode(test_data.encode()).decode("utf-8")
+    media_type = "image/jpeg"
+
+    image_url = ImageUrl.from_base64(media_type, base64_data)
+    expected_url = f"data:{media_type};base64,{base64_data}"
+    assert image_url.url == expected_url
+
+
+def test_image_url_from_path(tmp_path):
+    """Test creating ImageUrl from a file path"""
+    # Create a temporary test image file
+    test_image = tmp_path / "test_image.jpg"
+    test_content = b"fake image content"
+    test_image.write_bytes(test_content)
+
+    image_url = ImageUrl.from_path(test_image)
+
+    # Verify the URL starts with the expected data URI prefix
+    assert image_url.url.startswith("data:image/jpeg;base64,")
+
+    # Decode the base64 part and verify the content matches
+    base64_part = image_url.url.split(",")[1]
+    decoded_content = base64.b64decode(base64_part)
+    assert decoded_content == test_content
+
+
+def test_image_url_from_path_nonexistent():
+    """Test creating ImageUrl from a nonexistent file path"""
+    with pytest.raises(FileNotFoundError):
+        ImageUrl.from_path(Path("nonexistent.jpg"))