tests: use config.path instead of electrum_path for network-aware test dirs

SimpleConfig.path differs from electrum_path when the active network has a
subdirectory (e.g. BitcoinPurple mainnet). Tests that wrote directly to
electrum_path were resolving the wrong directory; use config.path consistently.
Also reorder setUp() so config is created before any path-dependent operations

tests/test_blockchain.py

@@ -57,9 +57,9 @@ class TestBlockchain(ElectrumTestCase):
 
     def setUp(self):
         super().setUp()
-        self.data_dir = self.electrum_path
+        self.config = SimpleConfig({'electrum_path': self.electrum_path})
+        self.data_dir = self.config.path
         make_dir(os.path.join(self.data_dir, 'forks'))
-        self.config = SimpleConfig({'electrum_path': self.data_dir})
         blockchain.blockchains = {}
 
     def _append_header(self, chain: Blockchain, header: dict):

tests/test_commands.py

@@ -197,7 +197,7 @@ class TestCommandsTestnet(ElectrumTestCase):
         super().setUp()
         self.config = SimpleConfig({'electrum_path': self.electrum_path})
         self.config.NETWORK_OFFLINE = True
-        shutil.copytree(os.path.join(os.path.dirname(__file__), "fiat_fx_data"), os.path.join(self.electrum_path, "cache"))
+        shutil.copytree(os.path.join(os.path.dirname(__file__), "fiat_fx_data"), os.path.join(self.config.path, "cache"))
         self.config.FX_EXCHANGE = "BitFinex"
         self.config.FX_CURRENCY = "EUR"
         self._default_default_timezone = electrum.util.DEFAULT_TIMEZONE

tests/test_simple_config.py

@@ -107,7 +107,7 @@ class Test_SimpleConfig(ElectrumTestCase):
                               read_user_dir_function=read_user_dir)
         config.save_user_config()
         contents = None
-        with open(os.path.join(self.electrum_dir, "config"), "r") as f:
+        with open(os.path.join(config.path, "config"), "r") as f:
             contents = f.read()
         result = ast.literal_eval(contents)
         result.pop('config_version', None)

tests/test_wallet.py

@@ -225,8 +225,8 @@ class TestHistoryExport(ElectrumTestCase):
         self.patch_timezone.start()
         time.tzset()
         super(TestHistoryExport, self).setUp()
-        shutil.copytree(Path(__file__).parent / "fiat_fx_data", Path(self.electrum_path) / "cache")
         self.config = SimpleConfig({'electrum_path': self.electrum_path})
+        shutil.copytree(Path(__file__).parent / "fiat_fx_data", Path(self.config.path) / "cache")
 
     def tearDown(self):
         super(TestHistoryExport, self).tearDown()