Fix syntax error in string formatting of GainData class

Author: chaudum

rgain3/lib/__init__.py

@@ -28,7 +28,6 @@ class GainType(enum.Enum):
 
 
 class GainData:
-
     """A class that contains Replay Gain data.
 
     Arguments for ``__init__`` are also instance variables. These are:
@@ -48,7 +47,7 @@ def __init__(self,
         self.gain_type = gain_type
 
     def __str__(self):
-        return "gain={.2f} dB; peak={.8f}; reference-level={} dB".format(
+        return "gain={:.2f} dB; peak={:.8f}; reference-level={} dB".format(
             self.gain, self.peak, self.ref_level
         )
 

test/test_rgain_init.py

@@ -4,6 +4,26 @@
 
 
 class TestGainData(unittest.TestCase):
+    def test_str(self):
+        self.assertEqual(
+            str(GainData(-1.2)),
+            "gain=-1.20 dB; peak=1.00000000; reference-level=89 dB"
+        )
+        self.assertEqual(
+            str(GainData(-1.2, 0.6, 88, GainType.TP_ALBUM)),
+            "gain=-1.20 dB; peak=0.60000000; reference-level=88 dB"
+        )
+
+    def test_repr(self):
+        self.assertEqual(
+            repr(GainData(-1.2)),
+            "GainData(-1.2, 1.0, 89, GainType.TP_UNDEFINED)",
+        )
+        self.assertEqual(
+            repr(GainData(-1.2, 0.6, 88, GainType.TP_ALBUM)),
+            "GainData(-1.2, 0.6, 88, GainType.TP_ALBUM)",
+        )
+
     def test_eq(self):
         gd1 = GainData(-5, 0.5, 80)
         gd2 = GainData(-5, 0.5, 80)