test: add sources for future testing

Author: AlbertoCentonze

tests/contracts/unused_constant/aliased_consumer.vy

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+# pragma version >=0.4.0
+
+from . import provider as prov
+
+# This uses USED_CONSTANT through an aliased import
+aliased_value: uint256
+
+@deploy
+def __init__():
+    self.aliased_value = prov.USED_CONSTANT

tests/contracts/unused_constant/aliased_importer.vy

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+import provider as prov

tests/contracts/unused_constant/consumer.vy

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+# pragma version >=0.4.0
+
+from . import provider
+
+# This line uses the constant from the provider module.
+some_value: uint256
+
+@deploy
+def __init__():
+    self.some_value = provider.USED_CONSTANT

tests/contracts/unused_constant/importer.vy

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+import provider

tests/contracts/unused_constant/nested_aliased_consumer.vy

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+import importer as imp
+
+@deploy
+def __init__():
+    print(imp.provider.NESTED_USED_CONSTANT)

tests/contracts/unused_constant/nested_consumer.vy

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+import importer
+
+@deploy
+def __init__():
+    print(importer.provider.NESTED_ALIASED_USED_CONSTANT)

tests/contracts/unused_constant/nested_double_aliased_consumer.vy

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+import aliased_importer as imp
+
+@deploy
+def __init__():
+    print(imp.prov.NESTED_DOUBLE_ALIASED_USED_CONSTANT)

tests/contracts/unused_constant/provider.vy

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+# pragma version >=0.4.0
+
+# This constant is used by consumer.vy, so it should NOT be flagged.
+USED_CONSTANT: constant(uint256) = 100
+
+# This constant is used only within this file, so it should NOT be flagged.
+LOCALLY_USED_CONSTANT: constant(uint256) = 200
+
+# This constant is never used anywhere, so it SHOULD be flagged.
+TRULY_UNUSED_CONSTANT: constant(uint256) = 300
+
+# This constant is used but only through module1.module2.NESTED_USED_CONSTANT
+NESTED_USED_CONSTANT: constant(uint256) = 400
+
+# This constant is used but only through alias1.module2.NESTED_USED_CONSTANT
+NESTED_ALIASED_USED_CONSTANT: constant(uint256) = 600
+
+# This constant is used but only through alias1.alias2.NESTED_DOUBLE_ALIASED_USED_CONSTANT
+NESTED_DOUBLE_ALIASED_USED_CONSTANT: constant(uint256) = 500
+
+my_var: uint256
+
+@deploy
+def __init__():
+    self.my_var = LOCALLY_USED_CONSTANT