diff --git a/karabo/simulation/sky_model.py b/karabo/simulation/sky_model.py
index 1ab63a59..eab285e1 100644
--- a/karabo/simulation/sky_model.py
+++ b/karabo/simulation/sky_model.py
@@ -368,7 +368,7 @@ def extract_names_and_freqs(
         for col in cols:
             col_name = col.name
             if not isinstance(col_name, str):
-                raise RuntimeError(
+                raise TypeError(
                     f"`col_name` should be of type `str`, but is {type(col_name)=}"
                 )
             match = pattern.match(string=col_name)
diff --git a/karabo/test/test_data.py b/karabo/test/test_data.py
deleted file mode 100644
index 0d527e14..00000000
--- a/karabo/test/test_data.py
+++ /dev/null
@@ -1,19 +0,0 @@
-from karabo.data.external_data import GLEAMSurveyDownloadObject
-from karabo.simulation.sky_model import SkyModel, SkyPrefixMapping
-
-
-def test_download_gleam():
-    survey = GLEAMSurveyDownloadObject()
-    survey.get()
-
-
-def test_download_gleam_and_make_sky_model():
-    sky = SkyModel.get_GLEAM_Sky(min_freq=72e6, max_freq=80e6)
-    sample_prefix_mapping = SkyPrefixMapping([], [], [])
-    number_of_sky_attributes = len(sample_prefix_mapping.__dict__)
-
-    assert sky.num_sources > 0
-
-    # -1 since we do not return the source ID
-    assert sky.to_np_array().shape == (sky.num_sources, number_of_sky_attributes - 1)
-    assert sky.source_ids["dim_0"].shape[0] == sky.shape[0]  # checking source-ids
diff --git a/karabo/test/test_skymodel.py b/karabo/test/test_skymodel.py
index 88d7315f..f884c1d8 100644
--- a/karabo/test/test_skymodel.py
+++ b/karabo/test/test_skymodel.py
@@ -23,6 +23,7 @@
     MIGHTEESurveyDownloadObject,
 )
 from karabo.simulation.sky_model import (
+    KaraboSkyModelError,
     Polarisation,
     SkyModel,
     SkyPrefixMapping,
@@ -37,6 +38,26 @@ def gleam() -> SkyModel:
     return SkyModel.get_GLEAM_Sky(min_freq=72e6, max_freq=80e6)
 
 
+def test_download_gleam_and_make_sky_model():
+    sky = SkyModel.get_GLEAM_Sky(min_freq=72e6, max_freq=80e6)
+    sample_prefix_mapping = SkyPrefixMapping([], [], [])
+    number_of_sky_attributes = len(sample_prefix_mapping.__dict__)
+
+    assert sky.num_sources > 0
+
+    # -1 since we do not return the source ID
+    assert sky.to_np_array().shape == (sky.num_sources, number_of_sky_attributes - 1)
+    assert sky.source_ids["dim_0"].shape[0] == sky.shape[0]  # checking source-ids
+
+
+def test_mightee():
+    _ = SkyModel.get_MIGHTEE_Sky()
+    with pytest.raises(KaraboSkyModelError):
+        _ = SkyModel.get_MIGHTEE_Sky(min_freq=3e11)
+    _ = SkyModel.get_MIGHTEE_Sky(max_freq=3e11)
+    _ = SkyModel.get_MIGHTEE_Sky(min_freq=1.3e9, max_freq=1.4e9)
+
+
 def test_filter_sky_model(gleam: SkyModel):
     phase_center = [250, -80]  # ra,dec
     filtered_sky = gleam.filter_by_radius(0, 0.55, phase_center[0], phase_center[1])