Add metric file output for testing CmdStanMCMC construction from output files

Author: amas0

test/data/logistic_output_1_metric.json

@@ -0,0 +1,6 @@
+
+{
+  "stepsize" : 0.82296841508129293,
+  "metric_type" : "diag_e",
+  "inv_metric" : [ 0.047463090328577061, 0.050351054427227954 ]
+}

test/data/logistic_output_2_metric.json

@@ -0,0 +1,6 @@
+
+{
+  "stepsize" : 0.80723664360220015,
+  "metric_type" : "diag_e",
+  "inv_metric" : [ 0.043061277646603849, 0.055466639648440334 ]
+}

test/data/logistic_output_3_metric.json

@@ -0,0 +1,6 @@
+
+{
+  "stepsize" : 0.77878893921149328,
+  "metric_type" : "diag_e",
+  "inv_metric" : [ 0.047900911429023758, 0.06720219760749839 ]
+}

test/data/logistic_output_4_metric.json

@@ -0,0 +1,6 @@
+
+{
+  "stepsize" : 0.85214264077664958,
+  "metric_type" : "diag_e",
+  "inv_metric" : [ 0.047588440045735959, 0.061979369732888139 ]
+}

test/test_sample.py

@@ -1743,6 +1743,12 @@ def test_metadata() -> None:
         os.path.join(DATAFILES_PATH, 'logistic_output_3.csv'),
         os.path.join(DATAFILES_PATH, 'logistic_output_4.csv'),
     ]
+    runset._metric_files = [
+        os.path.join(DATAFILES_PATH, 'logistic_output_1_metric.json'),
+        os.path.join(DATAFILES_PATH, 'logistic_output_2_metric.json'),
+        os.path.join(DATAFILES_PATH, 'logistic_output_3_metric.json'),
+        os.path.join(DATAFILES_PATH, 'logistic_output_4_metric.json'),
+    ]
     retcodes = runset._retcodes
     for i in range(len(retcodes)):
         runset._set_retcode(i, 0)