diff --git a/tests/test_function.py b/tests/test_function.py
new file mode 100644
index 000000000..37df7380a
--- /dev/null
+++ b/tests/test_function.py
@@ -0,0 +1,83 @@
+from slither import Slither
+from slither.core.declarations.function import FunctionType
+from slither.core.solidity_types.elementary_type import ElementaryType
+
+"""
+tests for slither.core.declarations.Function.
+tests that `tests/functions.sol` gets translated into correct
+slither.core.declarations.Function objects or its subclasses
+and that these objects behave correctly.
+"""
+
+def test_functions():
+    slither = Slither("tests/test_function.sol")
+    functions = slither.contracts_as_dict["TestFunction"].available_functions_as_dict()
+    print(functions)
+
+    f = functions["external_payable(uint256)"]
+    assert f.name == "external_payable"
+    assert f.full_name == "external_payable(uint256)"
+    assert f.canonical_name == "TestFunction.external_payable(uint256)"
+    assert f.solidity_signature == "external_payable(uint256)"
+    assert f.signature_str == "external_payable(uint256) returns(uint256)"
+    assert f.function_type == FunctionType.NORMAL
+    assert not f.contains_assembly
+    assert not f.can_reenter()
+    assert not f.can_send_eth()
+    assert not f.is_constructor
+    assert not f.is_fallback
+    assert not f.is_receive
+    assert f.payable
+    assert f.visibility == "external"
+    assert not f.view
+    assert not f.pure
+    assert f.is_implemented
+    assert not f.is_empty
+    assert f.parameters[0].name == "_a"
+    assert f.parameters[0].type == ElementaryType("uint256")
+    assert f.return_type[0] == ElementaryType("uint256")
+
+    f = functions["public_reenter()"]
+    assert f.name == "public_reenter"
+    assert f.full_name == "public_reenter()"
+    assert f.canonical_name == "TestFunction.public_reenter()"
+    assert f.solidity_signature == "public_reenter()"
+    assert f.signature_str == "public_reenter() returns()"
+    assert f.function_type == FunctionType.NORMAL
+    assert not f.contains_assembly
+    assert f.can_reenter()
+    assert not f.can_send_eth()
+    assert not f.is_constructor
+    assert not f.is_fallback
+    assert not f.is_receive
+    assert not f.payable
+    assert f.visibility == "public"
+    assert not f.view
+    assert not f.pure
+    assert f.is_implemented
+    assert not f.is_empty
+    assert not f.parameters
+    assert not f.return_type
+
+    f = functions["public_payable_reenter_send(bool)"]
+    assert f.name == "public_payable_reenter_send"
+    assert f.full_name == "public_payable_reenter_send(bool)"
+    assert f.canonical_name == "TestFunction.public_payable_reenter_send(bool)"
+    assert f.solidity_signature == "public_payable_reenter_send(bool)"
+    assert f.signature_str == "public_payable_reenter_send(bool) returns()"
+    assert f.function_type == FunctionType.NORMAL
+    assert not f.contains_assembly
+    assert f.can_reenter()
+    assert f.can_send_eth()
+    assert not f.is_constructor
+    assert not f.is_fallback
+    assert not f.is_receive
+    assert f.payable
+    assert f.visibility == "public"
+    assert not f.view
+    assert not f.pure
+    assert f.is_implemented
+    assert not f.is_empty
+    assert f.parameters[0].name == "_b"
+    assert f.parameters[0].type == ElementaryType("bool")
+    assert not f.return_type
diff --git a/tests/test_function.sol b/tests/test_function.sol
new file mode 100644
index 000000000..4e26ae999
--- /dev/null
+++ b/tests/test_function.sol
@@ -0,0 +1,39 @@
+pragma solidity ^0.6.12;
+
+// solidity source used by tests/test_function.py.
+// tests/test_function.py tests that the functions
+// below get
+
+contract TestFunction {
+    bool entered = false;
+
+    function external_payable(uint _a) external payable returns (uint) {
+        return 1;
+    }
+
+    function public_reenter() public {
+        msg.sender.call("");
+    }
+
+    function public_payable_reenter_send(bool _b) public payable {
+        msg.sender.call{value: 1}("");
+    }
+
+    function external_send(uint _a) external {
+        require(!entered);
+        entered = true;
+        msg.sender.call{value: 1}("");
+    }
+
+    function _internal(uint _a) internal returns (uint) {
+        uint256 chain;
+        assembly {
+            chain := chainid()
+        }
+        return chain;
+    }
+
+    fallback() external {
+
+    }
+}