Extract number-formatters from misc

tests/utils/test_formatters.py

@@ -0,0 +1,37 @@
+from freqtrade.util import decimals_per_coin, round_coin_value, round_value
+
+
+def test_decimals_per_coin():
+    assert decimals_per_coin('USDT') == 3
+    assert decimals_per_coin('EUR') == 3
+    assert decimals_per_coin('BTC') == 8
+    assert decimals_per_coin('ETH') == 5
+
+
+def test_round_coin_value():
+    assert round_coin_value(222.222222, 'USDT') == '222.222 USDT'
+    assert round_coin_value(222.2, 'USDT', keep_trailing_zeros=True) == '222.200 USDT'
+    assert round_coin_value(222.2, 'USDT') == '222.2 USDT'
+    assert round_coin_value(222.12745, 'EUR') == '222.127 EUR'
+    assert round_coin_value(0.1274512123, 'BTC') == '0.12745121 BTC'
+    assert round_coin_value(0.1274512123, 'ETH') == '0.12745 ETH'
+
+    assert round_coin_value(222.222222, 'USDT', False) == '222.222'
+    assert round_coin_value(222.2, 'USDT', False) == '222.2'
+    assert round_coin_value(222.00, 'USDT', False) == '222'
+    assert round_coin_value(222.12745, 'EUR', False) == '222.127'
+    assert round_coin_value(0.1274512123, 'BTC', False) == '0.12745121'
+    assert round_coin_value(0.1274512123, 'ETH', False) == '0.12745'
+    assert round_coin_value(222.2, 'USDT', False, True) == '222.200'
+
+
+def test_round_value():
+
+    assert round_value(222.222222, 3) == '222.222'
+    assert round_value(222.2, 3) == '222.2'
+    assert round_value(222.00, 3) == '222'
+    assert round_value(222.12745, 3) == '222.127'
+    assert round_value(0.1274512123, 8) == '0.12745121'
+    assert round_value(0.1274512123, 5) == '0.12745'
+    assert round_value(222.2, 3, True) == '222.200'
+    assert round_value(222.2, 0, True) == '222'