diff --git a/test/spec.py b/test/spec.py
index c36c242..b741e5c 100644
--- a/test/spec.py
+++ b/test/spec.py
@@ -66,10 +66,9 @@ class SpectrumAnalysis(SpectrumQuantization):
         self.nbits_spec = 0
         self.nbits_est  = 0
 
-        self.g_idx = None
-
-        (noise_factor, xq, lastnz, nbits_residual_max, xg) = \
-            (None, None, None, None, None)
+        (self.g_idx, self.noise_factor, self.xq, self.lastnz,
+                self.nbits_residual_max, self.xg) = \
+            (None, None, None, None, None, None)
 
     def estimate_gain(self, x, nbits_spec, nbits_off, g_off):
 
@@ -406,7 +405,7 @@ class SpectrumSynthesis(SpectrumQuantization):
 
         super().__init__(dt, sr)
 
-        (lastnz, lsb_mode, g_idx) = \
+        (self.lastnz, self.lsb_mode, self.g_idx) = \
             (None, None, None)
 
     def fill_noise(self, bw, x, lastnz, f_nf, nf_seed):
diff --git a/test/tns.py b/test/tns.py
index ad7e560..65e1c03 100644
--- a/test/tns.py
+++ b/test/tns.py
@@ -68,7 +68,7 @@ class Tns:
         self.dt = dt
 
         (self.nfilters, self.lpc_weighting, self.rc_order, self.rc) = \
-            (None, None, [ None, None ], [ None, None ])
+            (0, False, np.array([ 0, 0 ]), np.array([ 0, 0 ]))
 
     def get_data(self):