Added tests for benign reentrancy

tests/detectors/reentrancy-benign/reentrancy-benign.sol

@@ -0,0 +1,61 @@
+pragma solidity ^0.4.0;
+
+contract ReentrancyBenign {
+    uint8 anotherVariableToChange;
+    uint8 counter = 0;
+
+    function bad0() public {
+        if (!(msg.sender.call())) {
+            revert();
+        }
+        counter += 1;
+    }
+
+    function bad1(address target) public {
+        (bool success) = target.call();
+        require(success);
+        counter += 1;
+    }
+
+    function bad2(address target) public {
+        (bool success) = target.call();
+        if (success) {
+            address(target).call.value(1000)();
+            counter += 1;
+        }
+        else {
+            revert();
+        }
+    }
+
+    function bad3(address target) public {
+        externalCaller(target);
+        varChanger();
+        ethSender(target);
+    }
+
+    function bad4(address target) public {
+        externalCaller(target);
+        ethSender(address(0));
+        varChanger();
+        address(target).call.value(2)();
+    }
+
+    function bad5(address target) public {
+        ethSender(address(0));
+        varChanger();
+        ethSender(address(0));
+    }
+
+    function externalCaller(address target) private {
+        address(target).call();
+    }
+
+    function ethSender(address target) private {
+        address(target).call.value(1)();
+    }
+
+    function varChanger() private {
+        anotherVariableToChange++;
+    }
+}

tests/test_detectors.py

@@ -53,6 +53,11 @@ def id_test(test_item: Test):
 
 
 ALL_TESTS = [
+    Test(
+        all_detectors.ReentrancyBenign,
+        "tests/detectors/reentrancy-benign/reentrancy-benign.sol",
+        "0.4.26",
+    ),
     Test(
         all_detectors.ReentrancyReadBeforeWritten,
         "tests/detectors/reentrancy-before-write/reentrancy-write.sol",