hevm: skip unit test contracts with no code

src/dapp-tests/pass/abstract.sol

@@ -0,0 +1,17 @@
+pragma solidity ^0.6.7;
+
+import {DSTest} from "ds-test/test.sol";
+
+// should not be run (no code)
+abstract contract MyTest is DSTest {
+    function testAbstract() public {
+        assertTrue(true);
+    }
+}
+
+// should run and pass
+contract TestMy is MyTest {
+    function testTrue() public {
+        assertTrue(true);
+    }
+}

src/hevm/CHANGELOG.md

@@ -14,6 +14,7 @@
 ### Fixed
 
 - The block gas limit and basefee are now correctly fetched when running tests via rpc
+- Test contracts with no code (e.g. `abstract` contracts) are now skipped
 
 ## 0.48.0 - 2021-08-03
 

src/hevm/src/EVM/Dapp.hs

@@ -140,7 +140,7 @@ findUnitTests match =
       Nothing -> []
       Just _  ->
         let testNames = unitTestMethodsFiltered (regexMatches match) c
-        in [(view contractName c, testNames) | not (null testNames)]
+        in [(view contractName c, testNames) | not (BS.null (view runtimeCode c)) && not (null testNames)]
 
 unitTestMethodsFiltered :: (Text -> Bool) -> (SolcContract -> [(Test, [AbiType])])
 unitTestMethodsFiltered matcher c =