Add float fail-under tests

Author: Pieter Engelbrecht

tests/test_self.py

@@ -656,6 +656,15 @@ def test_fail_under(self):
             ],
             code=0,
         )
+        self._runtest(
+            [
+                "--fail-under",
+                "5.5",
+                "--enable=all",
+                join(HERE, "regrtest_data", "fail_under_plus6.py"),
+            ],
+            code=0,
+        )
         self._runtest(
             [
                 "--fail-under",
@@ -665,6 +674,15 @@ def test_fail_under(self):
             ],
             code=16,
         )
+        self._runtest(
+            [
+                "--fail-under",
+                "6.7",
+                "--enable=all",
+                join(HERE, "regrtest_data", "fail_under_plus6.py"),
+            ],
+            code=16,
+        )
 
         self._runtest(
             [