Test compatibility with 2.35

Author: WardBrian

.github/workflows/main.yml

@@ -42,7 +42,6 @@ jobs:
     name: tests
     runs-on: ${{ matrix.os }}
     strategy:
-      fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]

test/test_sample.py

@@ -646,19 +646,29 @@ def test_sample_no_params() -> None:
     stan = os.path.join(DATAFILES_PATH, 'datagen_poisson_glm.stan')
     datagen_model = CmdStanModel(stan_file=stan)
     datagen_fit = datagen_model.sample(iter_sampling=100, show_progress=False)
-    assert np.isnan(datagen_fit.step_size).all()
     summary = datagen_fit.summary()
-    assert 'lp__' in list(summary.index)
+
+    if cmdstan_version_before(2, 36):
+        assert 'lp__' not in list(summary.index)
+        assert datagen_fit.step_size is None
+    else:
+        assert 'lp__' in list(summary.index)
+        assert np.isnan(datagen_fit.step_size).all()
 
     exe_only = os.path.join(DATAFILES_PATH, 'exe_only')
     shutil.copyfile(datagen_model.exe_file, exe_only)
     os.chmod(exe_only, 0o755)
     datagen2_model = CmdStanModel(exe_file=exe_only)
     datagen2_fit = datagen2_model.sample(iter_sampling=200, show_console=True)
     assert datagen2_fit.chains == 4
-    assert np.isnan(datagen2_fit.step_size).all()
     summary = datagen2_fit.summary()
-    assert 'lp__' in list(summary.index)
+
+    if cmdstan_version_before(2, 36):
+        assert datagen2_fit.step_size is None
+        assert 'lp__' not in list(summary.index)
+    else:
+        assert np.isnan(datagen2_fit.step_size).all()
+        assert 'lp__' in list(summary.index)
 
 
 def test_index_bounds_error() -> None: