Require the bloom extra under CI so its tests never silently skip

The pybloomfilter skip guard keeps local runs green without the optional
bloom extra, but CI installs it (.github/workflows/test.yml), so a
missing pybloomfilter under CI is a broken setup, not an absent optional
dependency. Re-raise the ImportError when the CI env var is set, so the
bloom tests fail loudly rather than silently skipping and dropping
coverage.

Author: ekzhu

test/test_lshbloom.py

@@ -9,12 +9,17 @@
 
 # pybloomfilter is an optional dependency (the `bloom` extra); the classes
 # above import fine without it but raise on use. Skip rather than error when
-# it is absent, as the GPU and storage-backend tests do for theirs.
+# it is absent, as the GPU and storage-backend tests do for theirs -- but the
+# `bloom` extra IS installed in CI (see .github/workflows/test.yml), so a
+# missing pybloomfilter under CI means a broken setup, not an optional-dep
+# absence: fail loudly there instead of silently dropping coverage.
 try:
     import pybloomfilter  # noqa: F401
 
     BLOOM_AVAILABLE = True
 except ImportError:
+    if os.environ.get("CI"):
+        raise
     BLOOM_AVAILABLE = False
 
 _SKIP_REASON = "pybloomfilter not installed (pip install datasketch[bloom])"