[test] Add missing conftest for pytest

bob/ip/binseg/test/conftest.py

+#!/usr/bin/env python
+# coding=utf-8
+
+import pytest
+import bob.extension
+
+
+def pytest_configure(config):
+    """This function is run once for pytest setup"""
+
+    config.addinivalue_line(
+        "markers",
+        "skip_if_rc_var_not_set(name): this mark skips the test if a certain "
+        "~/.bobrc variable is not set",
+    )
+
+
+    config.addinivalue_line("markers", "slow: this mark indicates slow tests")
+
+
+def pytest_runtest_setup(item):
+    """This function is run for every test candidate in this directory
+
+    The test is run if this function returns ``None``.  To skip a test, call
+    ``pytest.skip()``, specifying a reason.
+    """
+
+    # iterates over all markers for the item being examined, get the first
+    # argument and accumulate these names
+    rc_names = [
+        mark.args[0]
+        for mark in item.iter_markers(name="skip_if_rc_var_not_set")
+    ]
+
+    # checks all names mentioned are set in ~/.bobrc, otherwise, skip the test
+    if rc_names:
+        missing = [k for k in rc_names if (k not in bob.extension.rc)]
+        if any(missing):
+            pytest.skip(f"Test skipped because {', '.join(missing)} are **not** "
+                    f"set in ~/.bobrc")
+
+
+def rc_variable_set(name):
+    pytest.mark.skipif(
+        name not in bob.extension.rc,
+        reason=f"Bob's RC variable '{name}' is not set",
+    )