Implement support for packages not backed by Git repos

testing/baselines/tests.bundle-directory/output

@@ -0,0 +1,2 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+error: failed to create bundle: cannot bundle directory package <...>/mypkg: bundling requires a Git repository

testing/baselines/tests.install-directory/output

@@ -0,0 +1,2 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+Hello, world!

testing/baselines/tests.install-invalid/output

@@ -1,8 +1,9 @@
 ### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
 error: invalid package ".": Package name ' fronting-whitespace' is not valid.
 error: invalid package ".": Package name 'trailing-whitespace ' is not valid.
-error: path ./packages/doesntexist is not a git repository
-error: path ./packages/notagitrepo is not a git repository
-error: local git clone at ./packages/dirtyrepo is dirty
+error: path .<...>/doesntexist is not a git repository or a directory
+XXXX-XX-XX XX:XX:XX WARNING  <...>/bro-pkg.meta: missing metadata file
+error: invalid package ".<...>/notagitrepo": missing zkg.meta (or bro-pkg.meta) metadata file
+error: local git clone at .<...>/dirtyrepo is dirty
 error: local git clone at dirtyrepo is dirty
 error: local git clone at ./dirtyrepo is dirty

testing/baselines/tests.install-skip-version-validation/error

@@ -0,0 +1,3 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+error: incomplete installation, the follow packages failed to be installed:
+  <...>/mypkg (v1.0.1)

testing/baselines/tests.install-skip-version-validation/warning

@@ -0,0 +1,2 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+XXXX-XX-XX XX:XX:XX WARNING  zkg.meta version 'v9.9.9' does not match Git tag 'v1.0.1'

testing/baselines/tests.test-directory/output

@@ -0,0 +1,2 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+<...>/mypkg: all tests passed

testing/conftest.py

@@ -1,11 +1,20 @@
-"""Global fixture for setting up coverage for launched subprocesses."""
+"""Configures pytest runtime behavior for this test suite."""
 
 import os
 
+import pytest
+
 # Point coverage in spawned processes to global coverage configuration and state file.
 _project_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 os.environ.setdefault(
     "COVERAGE_PROCESS_START",
     os.path.join(_project_root, ".coveragerc"),
 )
 os.environ.setdefault("COVERAGE_FILE", os.path.join(_project_root, ".coverage"))
+
+
+def pytest_collection_modifyitems(items: list[pytest.Item]) -> None:
+    # Run slow BTest integration tests last so we get fast feedback from unit tests.
+    unit_tests = [i for i in items if i.fspath.basename != "test_btest.py"]
+    btest_tests = [i for i in items if i.fspath.basename == "test_btest.py"]
+    items[:] = unit_tests + btest_tests