Fix the broken test and add a test_settings.py that is useful for running the tests locally without redis

Author: Jon

datalab/datalab_session/analysis/raw_data.py

@@ -4,6 +4,8 @@
 from datalab.datalab_session.file_utils import get_hdu
 from fits2image.scaling import extract_samples, calc_zscale_min_max
 
+# TODO: This analysis endpoint assumes the image to be of 16 bitdepth. We should make this agnositc to bit depth in the future
+
 def raw_data(input: dict):
     fits_path = get_fits(input['basename'], input.get('source', 'archive'))
 
@@ -15,8 +17,8 @@ def raw_data(input: dict):
     median = np.median(samples)
     _, zmax, _ = calc_zscale_min_max(samples, contrast=0.1, iterations=1)
 
-    # resize the image to max. 500 pixels on an axis
-    max_size = input.get('max_size', 800)
+    # resize the image to max. 500 pixels on an axis by default for the UI
+    max_size = input.get('max_size', 500)
     image = Image.fromarray(image_data)
     newImage = image.resize((max_size, max_size), Image.LANCZOS)
     scaled_array = np.asarray(newImage).astype(np.float16)

datalab/datalab_session/tests/test_files/rgb_stack/rgb_stack.fits

@@ -0,0 +1,8 @@
+from datalab.settings import *
+
+CACHES = {
+    'default': {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        'LOCATION': 'unique-snowflake'
+    },
+}