ef_tests: skipped tests and bls_setting support

tests/ef_tests/src/error.rs

@@ -6,6 +6,8 @@ pub enum Error {
     DidntFail(String),
     /// Failed to parse the test (internal error).
     FailedToParseTest(String),
+    /// Skipped the test.
+    Skipped,
 }
 
 impl Error {
@@ -14,6 +16,7 @@ impl Error {
             Error::NotEqual(_) => "NotEqual",
             Error::DidntFail(_) => "DidntFail",
             Error::FailedToParseTest(_) => "FailedToParseTest",
+            Error::Skipped => "Skipped",
         }
     }
 
@@ -22,6 +25,14 @@ impl Error {
             Error::NotEqual(m) => m.as_str(),
             Error::DidntFail(m) => m.as_str(),
             Error::FailedToParseTest(m) => m.as_str(),
+            Error::Skipped => panic!(), // "Skipped",
+        }
+    }
+
+    pub fn is_skipped(&self) -> bool {
+        match self {
+            Error::Skipped => true,
+            _ => false,
         }
     }
 }