Add tests for deepcopying and also some additional edge cases for constructing

test/test_sfg.py

 from b_asic import SFG
 from b_asic.signal import Signal
-from b_asic.core_operations import Addition, Constant
+from b_asic.core_operations import Addition, Constant, Multiplication
 from b_asic.special_operations import Input, Output
 
+
 class TestConstructor:
+    def test_direct_input_to_output_sfg_construction(self):
+        inp = Input("INP1")
+        out = Output(None, "OUT1")
+        out.input(0).connect(inp, "S1")
+
+        sfg = SFG(inputs=[inp], outputs=[out])
+
+        assert len(list(sfg.components)) == 3
+        assert sfg.input_count == 1
+        assert sfg.output_count == 1
+
+    def test_same_signal_input_and_output_sfg_construction(self):
+        sig1 = Signal(None, None, "S1")
+
+        sfg = SFG(input_signals=[sig1], output_signals=[sig1])
+
+        assert len(list(sfg.components)) == 3
+        assert sfg.input_count == 1
+        assert sfg.output_count == 1
+
     def test_outputs_construction(self, operation_tree):
         outp = Output(operation_tree)
         sfg = SFG(outputs=[outp])
@@ -20,13 +41,47 @@ class TestConstructor:
         assert sfg.input_count == 0
         assert sfg.output_count == 1
 
-    def test_operations_construction(self, operation_tree):
-        sfg1 = SFG(operations=[operation_tree])
-        sfg2 = SFG(operations=[operation_tree.input(1).signals[0].source.operation])
 
-        assert len(list(sfg1.components)) == 5
-        assert len(list(sfg2.components)) == 5
-        assert sfg1.input_count == 0
-        assert sfg2.input_count == 0
-        assert sfg1.output_count == 0
-        assert sfg2.output_count == 0
+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_deep_copy = mac_sfg.deep_copy()
+
+        for g_id, component in mac_sfg._components_by_id.items():
+            component_copy = mac_sfg_deep_copy.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], name="mac_sfg")
+
+        mac_sfg_deep_copy = mac_sfg.deep_copy()
+
+        for g_id, component in mac_sfg._components_by_id.items():
+            component_copy = mac_sfg_deep_copy.find_by_id(g_id)
+            assert component.name == component_copy.name