Add test `Distribution`

Inst_eddies/Analysis/tests.json

@@ -126,5 +126,12 @@
       "-n",
       "61391"
     ]
+  },
+  "Distribution": {
+    "command": [
+      "$src_dir/Inst_eddies/Analysis/distribution_function.py",
+      "$tests_old_dir/Region_5_15_days/SHPC/Slice_0/Anticyclones",
+      "--save"
+    ]
   }
 }