test_sfg.py

import pytest

from b_asic import SFG, Signal, Input, Output, Constant, ConstantMultiplication, Addition, Multiplication, Register, \
    Butterfly, Subtraction, SquareRoot


class TestInit:
    def test_direct_input_to_output_sfg_construction(self):
        in1 = Input("IN1")
        out1 = Output(None, "OUT1")
        out1.input(0).connect(in1, "S1")

        sfg = SFG(inputs=[in1], outputs=[out1])  # in1 ---s1---> out1

        assert len(list(sfg.components)) == 3
        assert len(list(sfg.operations)) == 2
        assert sfg.input_count == 1
        assert sfg.output_count == 1

    def test_same_signal_input_and_output_sfg_construction(self):
        add1 = Addition(None, None, "ADD1")
        add2 = Addition(None, None, "ADD2")

        s1 = add2.input(0).connect(add1, "S1")

        # in1 ---s1---> out1
        sfg = SFG(input_signals=[s1], output_signals=[s1])

        assert len(list(sfg.components)) == 3
        assert len(list(sfg.operations)) == 2
        assert sfg.input_count == 1
        assert sfg.output_count == 1

    def test_outputs_construction(self, operation_tree):
        sfg = SFG(outputs=[Output(operation_tree)])

        assert len(list(sfg.components)) == 7
        assert len(list(sfg.operations)) == 4
        assert sfg.input_count == 0
        assert sfg.output_count == 1

    def test_signals_construction(self, operation_tree):
        sfg = SFG(output_signals=[Signal(source=operation_tree.output(0))])

        assert len(list(sfg.components)) == 7
        assert len(list(sfg.operations)) == 4
        assert sfg.input_count == 0
        assert sfg.output_count == 1


class TestPrintSfg:
    def test_one_addition(self):
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        add1 = Addition(inp1, inp2, "ADD1")
        out1 = Output(add1, "OUT1")
        sfg = SFG(inputs=[inp1, inp2], outputs=[out1], name="sf1")

        assert sfg.__str__() == \
            "id: add1, name: ADD1, input: [s1, s2], output: [s3]\n" + \
            "id: in1, name: INP1, input: [], output: [s1]\n" + \
            "id: in2, name: INP2, input: [], output: [s2]\n" + \
            "id: out1, name: OUT1, input: [s3], output: []\n"

    def test_add_mul(self):
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        inp3 = Input("INP3")
        add1 = Addition(inp1, inp2, "ADD1")
        mul1 = Multiplication(add1, inp3, "MUL1")
        out1 = Output(mul1, "OUT1")
        sfg = SFG(inputs=[inp1, inp2, inp3], outputs=[out1], name="mac_sfg")

        assert sfg.__str__() == \
            "id: add1, name: ADD1, input: [s1, s2], output: [s5]\n" + \
            "id: in1, name: INP1, input: [], output: [s1]\n" + \
            "id: in2, name: INP2, input: [], output: [s2]\n" + \
            "id: mul1, name: MUL1, input: [s5, s3], output: [s4]\n" + \
            "id: in3, name: INP3, input: [], output: [s3]\n" + \
            "id: out1, name: OUT1, input: [s4], output: []\n"

    def test_constant(self):
        inp1 = Input("INP1")
        const1 = Constant(3, "CONST")
        add1 = Addition(const1, inp1, "ADD1")
        out1 = Output(add1, "OUT1")

        sfg = SFG(inputs=[inp1], outputs=[out1], name="sfg")

        assert sfg.__str__() == \
            "id: add1, name: ADD1, input: [s3, s1], output: [s2]\n" + \
            "id: c1, name: CONST, value: 3, input: [], output: [s3]\n" + \
            "id: in1, name: INP1, input: [], output: [s1]\n" + \
            "id: out1, name: OUT1, input: [s2], output: []\n"

    def test_simple_filter(self, simple_filter):
        assert simple_filter.__str__() == \
            'id: add1, name: , input: [s1, s3], output: [s4]\n' + \
            'id: in1, name: , input: [], output: [s1]\n' + \
            'id: cmul1, name: , input: [s5], output: [s3]\n' + \
            'id: reg1, name: , input: [s4], output: [s5, s2]\n' + \
            'id: out1, name: , input: [s2], output: []\n'


class TestDeepCopy:
    def test_deep_copy_no_duplicates(self):
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        inp3 = Input("INP3")
        add1 = Addition(inp1, inp2, "ADD1")
        mul1 = Multiplication(add1, inp3, "MUL1")
        out1 = Output(mul1, "OUT1")

        mac_sfg = SFG(inputs=[inp1, inp2], outputs=[out1], name="mac_sfg")
        mac_sfg_new = mac_sfg()

        assert mac_sfg.name == "mac_sfg"
        assert mac_sfg_new.name == ""

        for g_id, component in mac_sfg._components_by_id.items():
            component_copy = mac_sfg_new.find_by_id(g_id)
            assert component.name == component_copy.name

    def test_deep_copy(self):
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        inp3 = Input("INP3")
        add1 = Addition(None, None, "ADD1")
        add2 = Addition(None, None, "ADD2")
        mul1 = Multiplication(None, None, "MUL1")
        out1 = Output(None, "OUT1")

        add1.input(0).connect(inp1, "S1")
        add1.input(1).connect(inp2, "S2")
        add2.input(0).connect(add1, "S4")
        add2.input(1).connect(inp3, "S3")
        mul1.input(0).connect(add1, "S5")
        mul1.input(1).connect(add2, "S6")
        out1.input(0).connect(mul1, "S7")

        mac_sfg = SFG(inputs=[inp1, inp2], outputs=[out1],
                      id_number_offset=100, name="mac_sfg")
        mac_sfg_new = mac_sfg(name="mac_sfg2")

        assert mac_sfg.name == "mac_sfg"
        assert mac_sfg_new.name == "mac_sfg2"
        assert mac_sfg.id_number_offset == 100
        assert mac_sfg_new.id_number_offset == 100

        for g_id, component in mac_sfg._components_by_id.items():
            component_copy = mac_sfg_new.find_by_id(g_id)
            assert component.name == component_copy.name

    def test_deep_copy_with_new_sources(self):
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        inp3 = Input("INP3")
        add1 = Addition(inp1, inp2, "ADD1")
        mul1 = Multiplication(add1, inp3, "MUL1")
        out1 = Output(mul1, "OUT1")

        mac_sfg = SFG(inputs=[inp1, inp2], outputs=[out1], name="mac_sfg")

        a = Addition(Constant(3), Constant(5))
        b = Constant(2)
        mac_sfg_new = mac_sfg(a, b)
        assert mac_sfg_new.input(0).signals[0].source.operation is a
        assert mac_sfg_new.input(1).signals[0].source.operation is b


class TestEvaluateOutput:
    def test_evaluate_output(self, operation_tree):
        sfg = SFG(outputs=[Output(operation_tree)])
        assert sfg.evaluate_output(0, []) == 5

    def test_evaluate_output_large(self, large_operation_tree):
        sfg = SFG(outputs=[Output(large_operation_tree)])
        assert sfg.evaluate_output(0, []) == 14

    def test_evaluate_output_cycle(self, operation_graph_with_cycle):
        sfg = SFG(outputs=[Output(operation_graph_with_cycle)])
        with pytest.raises(Exception):
            sfg.evaluate_output(0, [])


class TestComponents:
    def test_advanced_components(self):
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        inp3 = Input("INP3")
        add1 = Addition(None, None, "ADD1")
        add2 = Addition(None, None, "ADD2")
        mul1 = Multiplication(None, None, "MUL1")
        out1 = Output(None, "OUT1")

        add1.input(0).connect(inp1, "S1")
        add1.input(1).connect(inp2, "S2")
        add2.input(0).connect(add1, "S4")
        add2.input(1).connect(inp3, "S3")
        mul1.input(0).connect(add1, "S5")
        mul1.input(1).connect(add2, "S6")
        out1.input(0).connect(mul1, "S7")

        mac_sfg = SFG(inputs=[inp1, inp2], outputs=[out1], name="mac_sfg")

        assert set([comp.name for comp in mac_sfg.components]) == {
            "INP1", "INP2", "INP3", "ADD1", "ADD2", "MUL1", "OUT1", "S1", "S2", "S3", "S4", "S5", "S6", "S7"}


class TestReplaceComponents:
    def test_replace_addition_by_id(self, operation_tree):
        sfg = SFG(outputs=[Output(operation_tree)])
        component_id = "add1"

        sfg = sfg.replace_component(
            Multiplication(name="Multi"), _id=component_id)
        assert component_id not in sfg._components_by_id.keys()
        assert "Multi" in sfg._components_by_name.keys()

    def test_replace_addition_large_tree(self, large_operation_tree):
        sfg = SFG(outputs=[Output(large_operation_tree)])
        component_id = "add3"

        sfg = sfg.replace_component(
            Multiplication(name="Multi"), _id=component_id)
        assert "Multi" in sfg._components_by_name.keys()
        assert component_id not in sfg._components_by_id.keys()

    def test_replace_no_input_component(self, operation_tree):
        sfg = SFG(outputs=[Output(operation_tree)])
        component_id = "c1"
        _const = sfg.find_by_id(component_id)

        sfg = sfg.replace_component(Constant(1), _id=component_id)
        assert _const is not sfg.find_by_id(component_id)

    def test_no_match_on_replace(self, large_operation_tree):
        sfg = SFG(outputs=[Output(large_operation_tree)])
        component_id = "addd1"

        try:
            sfg = sfg.replace_component(
                Multiplication(name="Multi"), _id=component_id)
        except AssertionError:
            assert True
        else:
            assert False

    def test_not_equal_input(self, large_operation_tree):
        sfg = SFG(outputs=[Output(large_operation_tree)])
        component_id = "c1"

        try:
            sfg = sfg.replace_component(
                Multiplication(name="Multi"), _id=component_id)
        except AssertionError:
            assert True
        else:
            assert False


class TestInsertComponent:

    def test_insert_component_in_sfg(self, large_operation_tree_names):
        sfg = SFG(outputs=[Output(large_operation_tree_names)])
        sqrt = SquareRoot()

        _sfg = sfg.insert_operation(sqrt, sfg.find_by_name("constant4")[0].graph_id)
        assert _sfg.evaluate() != sfg.evaluate()
        
        assert any([isinstance(comp, SquareRoot) for comp in _sfg.operations])
        assert not any([isinstance(comp, SquareRoot) for comp in sfg.operations])

        assert not isinstance(sfg.find_by_name("constant4")[0].output(0).signals[0].destination.operation, SquareRoot)
        assert isinstance(_sfg.find_by_name("constant4")[0].output(0).signals[0].destination.operation, SquareRoot)

        assert sfg.find_by_name("constant4")[0].output(0).signals[0].destination.operation is sfg.find_by_id("add3")
        assert _sfg.find_by_name("constant4")[0].output(0).signals[0].destination.operation is not _sfg.find_by_id("add3")
        assert _sfg.find_by_id("sqrt1").output(0).signals[0].destination.operation is _sfg.find_by_id("add3")

    def test_insert_invalid_component_in_sfg(self, large_operation_tree):
        sfg = SFG(outputs=[Output(large_operation_tree)])

        # Should raise an exception for not matching input count to output count.
        add4 = Addition()
        with pytest.raises(Exception):
            sfg.insert_operation(add4, "c1")

    def test_insert_at_output(self, large_operation_tree):
        sfg = SFG(outputs=[Output(large_operation_tree)])

        # Should raise an exception for trying to insert an operation after an output.
        sqrt = SquareRoot()
        with pytest.raises(Exception):
            _sfg = sfg.insert_operation(sqrt, "out1")

    def test_insert_multiple_output_ports(self, butterfly_operation_tree):
        sfg = SFG(outputs=list(map(Output, butterfly_operation_tree.outputs)))
        _sfg = sfg.insert_operation(Butterfly(name="n_bfly"), "bfly3")

        assert sfg.evaluate() != _sfg.evaluate()

        assert len(sfg.find_by_name("n_bfly")) == 0
        assert len(_sfg.find_by_name("n_bfly")) == 1

        # Correctly connected old output -> new input
        assert _sfg.find_by_name("bfly3")[0].output(0).signals[0].destination.operation is _sfg.find_by_name("n_bfly")[0]
        assert _sfg.find_by_name("bfly3")[0].output(1).signals[0].destination.operation is _sfg.find_by_name("n_bfly")[0]

        # Correctly connected new input -> old output
        assert _sfg.find_by_name("n_bfly")[0].input(0).signals[0].source.operation is _sfg.find_by_name("bfly3")[0]
        assert _sfg.find_by_name("n_bfly")[0].input(1).signals[0].source.operation is _sfg.find_by_name("bfly3")[0]

        # Correctly connected new output -> next input
        assert _sfg.find_by_name("n_bfly")[0].output(0).signals[0].destination.operation is _sfg.find_by_name("bfly2")[0]
        assert _sfg.find_by_name("n_bfly")[0].output(1).signals[0].destination.operation is _sfg.find_by_name("bfly2")[0]

        # Correctly connected next input -> new output
        assert _sfg.find_by_name("bfly2")[0].input(0).signals[0].source.operation is _sfg.find_by_name("n_bfly")[0]
        assert _sfg.find_by_name("bfly2")[0].input(1).signals[0].source.operation is _sfg.find_by_name("n_bfly")[0]

        
class TestFindComponentsWithTypeName:
    def test_mac_components(self):
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        inp3 = Input("INP3")
        add1 = Addition(None, None, "ADD1")
        add2 = Addition(None, None, "ADD2")
        mul1 = Multiplication(None, None, "MUL1")
        out1 = Output(None, "OUT1")

        add1.input(0).connect(inp1, "S1")
        add1.input(1).connect(inp2, "S2")
        add2.input(0).connect(add1, "S4")
        add2.input(1).connect(inp3, "S3")
        mul1.input(0).connect(add1, "S5")
        mul1.input(1).connect(add2, "S6")
        out1.input(0).connect(mul1, "S7")

        mac_sfg = SFG(inputs=[inp1, inp2], outputs=[out1], name="mac_sfg")

        assert {comp.name for comp in mac_sfg.get_components_with_type_name(
            inp1.type_name())} == {"INP1", "INP2", "INP3"}

        assert {comp.name for comp in mac_sfg.get_components_with_type_name(
            add1.type_name())} == {"ADD1", "ADD2"}

        assert {comp.name for comp in mac_sfg.get_components_with_type_name(
            mul1.type_name())} == {"MUL1"}

        assert {comp.name for comp in mac_sfg.get_components_with_type_name(
            out1.type_name())} == {"OUT1"}

        assert {comp.name for comp in mac_sfg.get_components_with_type_name(
            Signal.type_name())} == {"S1", "S2", "S3", "S4", "S5", "S6", "S7"}


class TestGetPrecedenceList:

    def test_inputs_registers(self):
        in1 = Input("IN1")
        c0 = ConstantMultiplication(5, in1, "C0")
        add1 = Addition(c0, None, "ADD1")
        # Not sure what operation "Q" is supposed to be in the example
        Q1 = ConstantMultiplication(1, add1, "Q1")
        T1 = Register(Q1, 0, "T1")
        T2 = Register(T1, 0, "T2")
        b2 = ConstantMultiplication(2, T2, "B2")
        b1 = ConstantMultiplication(3, T1, "B1")
        add2 = Addition(b1, b2, "ADD2")
        add1.input(1).connect(add2)
        a1 = ConstantMultiplication(4, T1, "A1")
        a2 = ConstantMultiplication(6, T2, "A2")
        add3 = Addition(a1, a2, "ADD3")
        a0 = ConstantMultiplication(7, Q1, "A0")
        add4 = Addition(a0, add3, "ADD4")
        out1 = Output(add4, "OUT1")

        sfg = SFG(inputs=[in1], outputs=[out1], name="SFG")

        precedence_list = sfg.get_precedence_list()

        assert len(precedence_list) == 7

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[0]]) == {"IN1", "T1", "T2"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[1]]) == {"C0", "B1", "B2", "A1", "A2"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[2]]) == {"ADD2", "ADD3"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[3]]) == {"ADD1"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[4]]) == {"Q1"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[5]]) == {"A0"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[6]]) == {"ADD4"}

    def test_inputs_constants_registers_multiple_outputs(self):
        in1 = Input("IN1")
        c0 = ConstantMultiplication(5, in1, "C0")
        add1 = Addition(c0, None, "ADD1")
        # Not sure what operation "Q" is supposed to be in the example
        Q1 = ConstantMultiplication(1, add1, "Q1")
        T1 = Register(Q1, 0, "T1")
        const1 = Constant(10, "CONST1")  # Replace T2 register with a constant
        b2 = ConstantMultiplication(2, const1, "B2")
        b1 = ConstantMultiplication(3, T1, "B1")
        add2 = Addition(b1, b2, "ADD2")
        add1.input(1).connect(add2)
        a1 = ConstantMultiplication(4, T1, "A1")
        a2 = ConstantMultiplication(10, const1, "A2")
        add3 = Addition(a1, a2, "ADD3")
        a0 = ConstantMultiplication(7, Q1, "A0")
        # Replace ADD4 with a butterfly to test multiple output ports
        bfly1 = Butterfly(a0, add3, "BFLY1")
        out1 = Output(bfly1.output(0), "OUT1")
        out2 = Output(bfly1.output(1), "OUT2")

        sfg = SFG(inputs=[in1], outputs=[out1], name="SFG")

        precedence_list = sfg.get_precedence_list()

        assert len(precedence_list) == 7

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[0]]) == {"IN1", "T1", "CONST1"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[1]]) == {"C0", "B1", "B2", "A1", "A2"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[2]]) == {"ADD2", "ADD3"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[3]]) == {"ADD1"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[4]]) == {"Q1"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[5]]) == {"A0"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[6]]) == {"BFLY1.0", "BFLY1.1"}

    def test_precedence_multiple_outputs_same_precedence(self, sfg_two_inputs_two_outputs):
        sfg_two_inputs_two_outputs.name = "NESTED_SFG"

        in1 = Input("IN1")
        sfg_two_inputs_two_outputs.input(0).connect(in1, "S1")
        in2 = Input("IN2")
        cmul1 = ConstantMultiplication(10, None, "CMUL1")
        cmul1.input(0).connect(in2, "S2")
        sfg_two_inputs_two_outputs.input(1).connect(cmul1, "S3")

        out1 = Output(sfg_two_inputs_two_outputs.output(0), "OUT1")
        out2 = Output(sfg_two_inputs_two_outputs.output(1), "OUT2")

        sfg = SFG(inputs=[in1, in2], outputs=[out1, out2])

        precedence_list = sfg.get_precedence_list()

        assert len(precedence_list) == 3

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[0]]) == {"IN1", "IN2"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[1]]) == {"CMUL1"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[2]]) == {"NESTED_SFG.0", "NESTED_SFG.1"}

    def test_precedence_sfg_multiple_outputs_different_precedences(self, sfg_two_inputs_two_outputs_independent):
        sfg_two_inputs_two_outputs_independent.name = "NESTED_SFG"

        in1 = Input("IN1")
        in2 = Input("IN2")
        sfg_two_inputs_two_outputs_independent.input(0).connect(in1, "S1")
        cmul1 = ConstantMultiplication(10, None, "CMUL1")
        cmul1.input(0).connect(in2, "S2")
        sfg_two_inputs_two_outputs_independent.input(1).connect(cmul1, "S3")
        out1 = Output(sfg_two_inputs_two_outputs_independent.output(0), "OUT1")
        out2 = Output(sfg_two_inputs_two_outputs_independent.output(1), "OUT2")

        sfg = SFG(inputs=[in1, in2], outputs=[out1, out2])

        precedence_list = sfg.get_precedence_list()

        assert len(precedence_list) == 3

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[0]]) == {"IN1", "IN2"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[1]]) == {"NESTED_SFG.0", "CMUL1"}

        assert set([port.operation.key(port.index, port.operation.name)
                    for port in precedence_list[2]]) == {"NESTED_SFG.1"}


class TestDepends:
    def test_depends_sfg(self, sfg_two_inputs_two_outputs):
        assert set(sfg_two_inputs_two_outputs.inputs_required_for_output(0)) == {
            0, 1}
        assert set(sfg_two_inputs_two_outputs.inputs_required_for_output(1)) == {
            0, 1}

    def test_depends_sfg_independent(self, sfg_two_inputs_two_outputs_independent):
        assert set(
            sfg_two_inputs_two_outputs_independent.inputs_required_for_output(0)) == {0}
        assert set(
            sfg_two_inputs_two_outputs_independent.inputs_required_for_output(1)) == {1}


class TestConnectExternalSignalsToComponentsSoloComp:

    def test_connect_external_signals_to_components_mac(self):
        """ Replace a MAC with inner components in an SFG """
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        inp3 = Input("INP3")
        add1 = Addition(None, None, "ADD1")
        add2 = Addition(None, None, "ADD2")
        mul1 = Multiplication(None, None, "MUL1")
        out1 = Output(None, "OUT1")

        add1.input(0).connect(inp1, "S1")
        add1.input(1).connect(inp2, "S2")
        add2.input(0).connect(add1, "S3")
        add2.input(1).connect(inp3, "S4")
        mul1.input(0).connect(add1, "S5")
        mul1.input(1).connect(add2, "S6")
        out1.input(0).connect(mul1, "S7")

        mac_sfg = SFG(inputs=[inp1, inp2], outputs=[out1])

        inp4 = Input("INP4")
        inp5 = Input("INP5")
        out2 = Output(None, "OUT2")

        mac_sfg.input(0).connect(inp4, "S8")
        mac_sfg.input(1).connect(inp5, "S9")
        out2.input(0).connect(mac_sfg.outputs[0], "S10")

        test_sfg = SFG(inputs=[inp4, inp5], outputs=[out2])
        assert test_sfg.evaluate(1, 2) == 9
        mac_sfg.connect_external_signals_to_components()
        assert test_sfg.evaluate(1, 2) == 9
        assert not test_sfg.connect_external_signals_to_components()

    def test_connect_external_signals_to_components_operation_tree(self, operation_tree):
        """ Replaces an SFG with only a operation_tree component with its inner components """
        sfg1 = SFG(outputs=[Output(operation_tree)])
        out1 = Output(None, "OUT1")
        out1.input(0).connect(sfg1.outputs[0], "S1")
        test_sfg = SFG(outputs=[out1])
        assert test_sfg.evaluate_output(0, []) == 5
        sfg1.connect_external_signals_to_components()
        assert test_sfg.evaluate_output(0, []) == 5
        assert not test_sfg.connect_external_signals_to_components()

    def test_connect_external_signals_to_components_large_operation_tree(self, large_operation_tree):
        """ Replaces an SFG with only a large_operation_tree component with its inner components """
        sfg1 = SFG(outputs=[Output(large_operation_tree)])
        out1 = Output(None, "OUT1")
        out1.input(0).connect(sfg1.outputs[0], "S1")
        test_sfg = SFG(outputs=[out1])
        assert test_sfg.evaluate_output(0, []) == 14
        sfg1.connect_external_signals_to_components()
        assert test_sfg.evaluate_output(0, []) == 14
        assert not test_sfg.connect_external_signals_to_components()


class TestConnectExternalSignalsToComponentsMultipleComp:

    def test_connect_external_signals_to_components_operation_tree(self, operation_tree):
        """ Replaces a operation_tree in an SFG with other components """
        sfg1 = SFG(outputs=[Output(operation_tree)])

        inp1 = Input("INP1")
        inp2 = Input("INP2")
        out1 = Output(None, "OUT1")

        add1 = Addition(None, None, "ADD1")
        add2 = Addition(None, None, "ADD2")

        add1.input(0).connect(inp1, "S1")
        add1.input(1).connect(inp2, "S2")
        add2.input(0).connect(add1, "S3")
        add2.input(1).connect(sfg1.outputs[0], "S4")
        out1.input(0).connect(add2, "S5")

        test_sfg = SFG(inputs=[inp1, inp2], outputs=[out1])
        assert test_sfg.evaluate(1, 2) == 8
        sfg1.connect_external_signals_to_components()
        assert test_sfg.evaluate(1, 2) == 8
        assert not test_sfg.connect_external_signals_to_components()

    def test_connect_external_signals_to_components_large_operation_tree(self, large_operation_tree):
        """ Replaces a large_operation_tree in an SFG with other components """
        sfg1 = SFG(outputs=[Output(large_operation_tree)])

        inp1 = Input("INP1")
        inp2 = Input("INP2")
        out1 = Output(None, "OUT1")
        add1 = Addition(None, None, "ADD1")
        add2 = Addition(None, None, "ADD2")

        add1.input(0).connect(inp1, "S1")
        add1.input(1).connect(inp2, "S2")
        add2.input(0).connect(add1, "S3")
        add2.input(1).connect(sfg1.outputs[0], "S4")
        out1.input(0).connect(add2, "S5")

        test_sfg = SFG(inputs=[inp1, inp2], outputs=[out1])
        assert test_sfg.evaluate(1, 2) == 17
        sfg1.connect_external_signals_to_components()
        assert test_sfg.evaluate(1, 2) == 17
        assert not test_sfg.connect_external_signals_to_components()

    def create_sfg(self, op_tree):
        """ Create a simple SFG with either operation_tree or large_operation_tree """
        sfg1 = SFG(outputs=[Output(op_tree)])

        inp1 = Input("INP1")
        inp2 = Input("INP2")
        out1 = Output(None, "OUT1")
        add1 = Addition(None, None, "ADD1")
        add2 = Addition(None, None, "ADD2")

        add1.input(0).connect(inp1, "S1")
        add1.input(1).connect(inp2, "S2")
        add2.input(0).connect(add1, "S3")
        add2.input(1).connect(sfg1.outputs[0], "S4")
        out1.input(0).connect(add2, "S5")

        return SFG(inputs=[inp1, inp2], outputs=[out1])

    def test_connect_external_signals_to_components_many_op(self, large_operation_tree):
        """ Replaces an sfg component in a larger SFG with several component operations """
        inp1 = Input("INP1")
        inp2 = Input("INP2")
        inp3 = Input("INP3")
        inp4 = Input("INP4")
        out1 = Output(None, "OUT1")
        add1 = Addition(None, None, "ADD1")
        sub1 = Subtraction(None, None, "SUB1")

        add1.input(0).connect(inp1, "S1")
        add1.input(1).connect(inp2, "S2")

        sfg1 = self.create_sfg(large_operation_tree)

        sfg1.input(0).connect(add1, "S3")
        sfg1.input(1).connect(inp3, "S4")
        sub1.input(0).connect(sfg1.outputs[0], "S5")
        sub1.input(1).connect(inp4, "S6")
        out1.input(0).connect(sub1, "S7")

        test_sfg = SFG(inputs=[inp1, inp2, inp3, inp4], outputs=[out1])
        assert test_sfg.evaluate(1, 2, 3, 4) == 16
        sfg1.connect_external_signals_to_components()
        assert test_sfg.evaluate(1, 2, 3, 4) == 16
        assert not test_sfg.connect_external_signals_to_components()