fixed checkConfig, fixed tests

saqc/core/reader.py

@@ -24,8 +24,8 @@ def checkConfig(config_df, data, flags, flagger, nodata):
             _raise(config_row, SyntaxError,
                    f"non-optional column '{F.VARNAME}' is missing")
 
-        test_fields = config_row.filter(regex=F.TESTS)
-        if test_fields.isna().all():
+        test_fields = config_row.filter(regex=F.TESTS).dropna()
+        if test_fields.empty:
             _raise(config_row,  SyntaxError,
                    f"at least one test needs to be given for variable")
 

test/core/test_core.py

@@ -99,9 +99,12 @@ def test_missingVariable(flagger):
     ]
     metafobj, meta = initMetaDict(metadict, data)
 
-    pdata, pflags = runner(metafobj, flagger, data)
-
-    assert (pdata.columns == [var]).all()
+    try:
+        pdata, pflags = runner(metafobj, flagger, data)
+    except NameError:
+        pass
+    else:
+        raise AssertionError('config checker should find this')
 
 
 @pytest.mark.parametrize("flagger", TESTFLAGGER)