Fixed an issue where single-value parameters could cause errors in ba…

…yes_opt, extended tests to test for this

kernel_tuner/strategies/bayes_opt.py

@@ -396,11 +396,13 @@ def find_param_config_unvisited_index(self, param_config: tuple) -> int:
         return self.unvisited_cache.index(param_config)
 
     def normalize_param_config(self, param_config: tuple) -> tuple:
-        """Normalizes a parameter configuration."""
-        normalized = tuple(
-            self.normalized_dict[self.param_names[index]][param_value] for index, param_value in enumerate(param_config)
-        )
-        return normalized
+        """Normalizes a parameter configuration. Skips over pruned values."""
+        param_config = self.unprune_param_config(param_config)
+        normalized = list()
+        for index, param_value in enumerate(param_config):
+            if self.removed_tune_params[index] is None:
+                normalized.append(self.normalized_dict[self.param_names[index]][param_value])
+        return tuple(normalized)
 
     def denormalize_param_config(self, param_config: tuple) -> tuple:
         """Denormalizes a parameter configuration."""

test/strategies/test_strategies.py

@@ -51,15 +51,30 @@ def test_strategies(vector_add, strategy):
 
     assert len(results) > 0
 
+    # check if the number of valid unique configurations is less than or equal to max_fevals
     if not strategy == "brute_force":
-        # check if the number of valid unique configurations is less then max_fevals
-
         tune_params = vector_add[-1]
         unique_results = {}
-
         for result in results:
             x_int = ",".join([str(v) for k, v in result.items() if k in tune_params])
             if not isinstance(result["time"], util.InvalidConfig):
                 unique_results[x_int] = result["time"]
-
         assert len(unique_results) <= filter_options["max_fevals"]
+
+    # check whether the returned dictionaries contain exactly the expected keys and the appropriate type
+    expected_items = {
+        'block_size_x': int,
+        'time': (float, int),
+        'times': list,
+        'compile_time': (float, int),
+        'verification_time': (float, int),
+        'benchmark_time': (float, int),
+        'strategy_time': (float, int),
+        'framework_time': (float, int),
+        'timestamp': str
+    }
+    for res in results:
+        assert len(res) == len(expected_items)
+        for expected_key, expected_type in expected_items.items():
+            assert expected_key in res
+            assert isinstance(res[expected_key], expected_type)