diff --git a/src/fml_doc_gen/generate_template.py b/src/fml_doc_gen/generate_template.py
index 6a33928..33cc46d 100644
--- a/src/fml_doc_gen/generate_template.py
+++ b/src/fml_doc_gen/generate_template.py
@@ -57,6 +57,9 @@ def generate_template(function_signature: FunctionDTO) -> str:
         ... )
         >>> generate_template(function_signature)
     """
+    if not isinstance(function_signature, FunctionDTO):
+        raise TypeError(f"Expected input to be FunctionDTO, got {type(function_signature)}")
+    
     # Name logic
     if not function_signature.name:
         raise ValueError("The name of the function cannot be empty!")
diff --git a/tests/test_generate_template.py b/tests/test_generate_template.py
new file mode 100644
index 0000000..d5c60c8
--- /dev/null
+++ b/tests/test_generate_template.py
@@ -0,0 +1,67 @@
+import pytest
+from fml_doc_gen.func_dto import FunctionDTO
+from fml_doc_gen.generate_template import generate_template
+
+
+def test_generate_template_input_type():
+    """
+    Test that generate_template raises a TypeError when the input is not an instance of FunctionDTO.
+    """
+    with pytest.raises(TypeError, match='Expected input to be FunctionDTO, got str'):
+        generate_template("foo")
+
+def test_generate_template_empty_name():
+    """
+    Test that generate_template raises a ValueError when the FunctionDTO name is empty.
+    """
+    f = FunctionDTO()
+    with pytest.raises(ValueError, match='The name of the function cannot be empty!'):
+        generate_template(f)
+
+def test_generate_template_name():
+    """
+    Test that generate_template generates the correct template when only the name is provided.
+    """
+    f = FunctionDTO(name = "square")
+    expected = '\n    square: \n    ### INSERT FUNCTION DEFINITION HERE ###\n    \n    \n      \n    Examples:\n    --------\n    ### INSERT FUNCTION EXAMPLE USAGES HERE ###\n'
+    actual = generate_template(f)
+    assert expected == actual
+
+def test_generate_template_name_output():
+    """
+    Test that generate_template generates the correct template when the name and output type are provided.
+    """
+    f = FunctionDTO(name = "square", output="int")
+    expected = '\n    square: \n    ### INSERT FUNCTION DEFINITION HERE ###\n    \n    \n    Returns:\n    -------\n    int\n        ### INSERT ADDITIONAL FUNCTION OUTPUT INFORMATION HERE ###\n\n      \n    Examples:\n    --------\n    ### INSERT FUNCTION EXAMPLE USAGES HERE ###\n'
+    actual = generate_template(f)
+    assert expected == actual
+
+def test_generate_template_name_output_params_1():
+    """
+    Test that generate_template generates the correct template when the name, output type, 
+    and parameters without specified types are provided.
+    """
+    f = FunctionDTO(name = "square", output="int", inputs=[('base', None), ('pow', None)])
+    expected = '\n    square: \n    ### INSERT FUNCTION DEFINITION HERE ###\n    \n    Parameters:\n    ----------\n    \n    base: ...\n    ### INSERT PARAMETER DEFINITION HERE ###\n    \n\n    pow: ...\n    ### INSERT PARAMETER DEFINITION HERE ###\n    \n\n\n    \n    Returns:\n    -------\n    int\n        ### INSERT ADDITIONAL FUNCTION OUTPUT INFORMATION HERE ###\n\n      \n    Examples:\n    --------\n    ### INSERT FUNCTION EXAMPLE USAGES HERE ###\n'
+    actual = generate_template(f)
+    assert expected == actual
+
+def test_generate_template_name_output_params_2():
+    """
+    Test that generate_template generates the correct template when the name, output type, 
+    and parameters with specified types are provided.
+    """
+    f = FunctionDTO(name = "square", output="int", inputs=[('base', 'int'), ('pow', 'int')])
+    expected = '\n    square: \n    ### INSERT FUNCTION DEFINITION HERE ###\n    \n    Parameters:\n    ----------\n    \n    base: int\n    ### INSERT PARAMETER DEFINITION HERE ###\n    \n\n    pow: int\n    ### INSERT PARAMETER DEFINITION HERE ###\n    \n\n\n    \n    Returns:\n    -------\n    int\n        ### INSERT ADDITIONAL FUNCTION OUTPUT INFORMATION HERE ###\n\n      \n    Examples:\n    --------\n    ### INSERT FUNCTION EXAMPLE USAGES HERE ###\n'
+    actual = generate_template(f)
+    assert expected == actual
+
+def test_generate_template_name_params_no_output():
+    """
+    Test that generate_template generates the correct template when the name
+    and parameters with specified types are provided, but no output type provided.
+    """
+    f = FunctionDTO(name = "square", output="int", inputs=[('base', 'int'), ('pow', 'int')])
+    expected = '\n    square: \n    ### INSERT FUNCTION DEFINITION HERE ###\n    \n    Parameters:\n    ----------\n    \n    base: int\n    ### INSERT PARAMETER DEFINITION HERE ###\n    \n\n    pow: int\n    ### INSERT PARAMETER DEFINITION HERE ###\n    \n\n\n    \n      \n    Examples:\n    --------\n    ### INSERT FUNCTION EXAMPLE USAGES HERE ###\n'
+    actual = generate_template(f)
+    assert expected == actual
\ No newline at end of file