[LIT] Add a test for lit.Test.toMetricValue. NFC

Author: jroelofs

Diff for: llvm/utils/lit/tests/Inputs/test-data/dummy_format.py

@@ -27,10 +27,16 @@ def execute(self, test, lit_config):
         # Load additional metrics.
         for key, value_str in cfg.items("results"):
             value = eval(value_str)
+            metric = lit.Test.toMetricValue(value)
             if isinstance(value, int):
-                metric = lit.Test.IntMetricValue(value)
+                assert isinstance(metric, lit.Test.IntMetricValue)
+                assert metric.format() == lit.Test.IntMetricValue(value).format()
             elif isinstance(value, float):
-                metric = lit.Test.RealMetricValue(value)
+                assert isinstance(metric, lit.Test.RealMetricValue)
+                assert metric.format() == lit.Test.RealMetricValue(value).format()
+            elif isinstance(value, str):
+                assert isinstance(metric, lit.Test.JSONMetricValue)
+                assert metric.format() == lit.Test.JSONMetricValue(value).format()
             else:
                 raise RuntimeError("unsupported result type")
             result.addMetric(key, metric)

Diff for: llvm/utils/lit/tests/Inputs/test-data/metrics.ini

@@ -4,4 +4,5 @@ result_output = Test passed.
 
 [results]
 value0 = 1
-value1 = 2.3456
+value1 = 2.3456
+value2 = "stringy"

Diff for: llvm/utils/lit/tests/test-data.py

@@ -9,4 +9,5 @@
 # CHECK-NEXT: *** TEST 'test-data :: metrics.ini' RESULTS ***
 # CHECK-NEXT: value0: 1
 # CHECK-NEXT: value1: 2.3456
+# CHECK-NEXT: value2: "stringy"
 # CHECK-NEXT: ***

Diff for: llvm/utils/lit/tests/test-output.py

@@ -10,7 +10,8 @@
 # CHECK-NEXT:     "elapsed": {{[-+0-9.eE]+}},
 # CHECK-NEXT:     "metrics": {
 # CHECK-NEXT:       "value0": 1,
-# CHECK-NEXT:       "value1": 2.3456
+# CHECK-NEXT:       "value1": 2.3456,
+# CHECK-NEXT:       "value2": "stringy"
 # CHECK-NEXT:     }
 # CHECK-NEXT:     "name": "test-data :: metrics.ini",
 # CHECK-NEXT:     "output": "Test passed."