diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index db0b8de1..b9d60c7a 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -7,7 +7,7 @@ on:
       - develop
   pull_request:
   schedule:
-    - cron: '0 4 * * *'
+    - cron: '0 4 1 * *'
 
 jobs:
   pytest:
diff --git a/pyerrors/obs.py b/pyerrors/obs.py
index c24da74a..168f7292 100644
--- a/pyerrors/obs.py
+++ b/pyerrors/obs.py
@@ -125,8 +125,6 @@ class Obs:
                 for name, sample, mean in sorted(zip(names, samples, means)):
                     self.shape[name] = len(self.idl[name])
                     self.N += self.shape[name]
-                    if len(sample) != self.shape[name]:
-                        raise Exception('Incompatible samples and idx for %s: %d vs. %d' % (name, len(sample), self.shape[name]))
                     self.r_values[name] = mean
                     self.deltas[name] = sample
             else:
diff --git a/tests/correlators_test.py b/tests/correlators_test.py
index f27bba54..6c3418f8 100644
--- a/tests/correlators_test.py
+++ b/tests/correlators_test.py
@@ -91,6 +91,14 @@ def test_fit_correlator():
     assert fit_res[1] == my_corr[1] - my_corr[0]
 
 
+def test_plateau():
+    my_corr = pe.correlators.Corr([pe.pseudo_Obs(1.01324, 0.05, 't'), pe.pseudo_Obs(1.042345, 0.008, 't')])
+
+    my_corr.plateau([0, 1], method="fit")
+    my_corr.plateau([0, 1], method="mean")
+    with pytest.raises(Exception):
+        my_corr.plateau()
+
 def test_utility():
     corr_content = []
     for t in range(8):
diff --git a/tests/obs_test.py b/tests/obs_test.py
index f5d04832..8fbfa43d 100644
--- a/tests/obs_test.py
+++ b/tests/obs_test.py
@@ -22,6 +22,12 @@ def test_Obs_exceptions():
         pe.Obs([np.random.rand(10)], [1])
     with pytest.raises(Exception):
         pe.Obs([np.random.rand(4)], ['name'])
+    with pytest.raises(Exception):
+        pe.Obs([np.random.rand(5)], ['1'], idl=[[5, 3, 2 ,4 ,1]])
+    with pytest.raises(Exception):
+        pe.Obs([np.random.rand(5)], ['1'], idl=['t'])
+    with pytest.raises(Exception):
+        pe.Obs([np.random.rand(5)], ['1'], idl=[range(1, 8)])
 
     my_obs = pe.Obs([np.random.rand(6)], ['name'])
     my_obs._value = 0.0
@@ -346,6 +352,7 @@ def test_overloaded_functions():
 
 
 def test_utils():
+    zero_pseudo_obs = pe.pseudo_Obs(1.0, 0.0, 'null')
     my_obs = pe.pseudo_Obs(1.0, 0.5, 't|r01')
     my_obs += pe.pseudo_Obs(1.0, 0.5, 't|r02')
     str(my_obs)
@@ -412,6 +419,15 @@ def test_reweighting():
     r_obs2 = r_obs[0] * my_obs
     assert r_obs2.reweighted
 
+    my_irregular_obs = pe.Obs([np.random.rand(500)], ['t'], idl=[range(1, 1001, 2)])
+    assert not my_irregular_obs.reweighted
+    r_obs = pe.reweight(my_obs, [my_irregular_obs], all_configs=True)
+    r_obs = pe.reweight(my_obs, [my_irregular_obs], all_configs=False)
+    r_obs = pe.reweight(my_obs, [my_obs])
+    assert r_obs[0].reweighted
+    r_obs2 = r_obs[0] * my_obs
+    assert r_obs2.reweighted
+
 
 def test_merge_obs():
     my_obs1 = pe.Obs([np.random.rand(100)], ['t'])