C#: Add some more test cases.

Author: michaelnebel

csharp/ql/test/query-tests/Likely Bugs/HashedButNoHash/HashedButNoHash.cs

@@ -7,9 +7,26 @@ public void M()
     {
         var h = new Hashtable();
         h.Add(this, null); // $ Alert
+        h.Contains(this); // $ Alert
+        h.ContainsKey(this); // $ Alert
+        h[this] = null; // $ Alert
+        h.Remove(this); // $ Alert
+
+        var l = new List<Test>();
+        l.Add(this); // Good
 
         var d = new Dictionary<Test, bool>();
         d.Add(this, false); // $ Alert
+        d.ContainsKey(this); // $ Alert
+        d[this] = false; // $ Alert
+        d.Remove(this); // $ Alert
+        d.TryAdd(this, false); // $ Alert
+        d.TryGetValue(this, out bool _); // $ Alert
+
+        var hs = new HashSet<Test>();
+        hs.Add(this); // $ Alert
+        hs.Contains(this); // $ Alert
+        hs.Remove(this); // $ Alert
     }
 
     public override bool Equals(object other)

csharp/ql/test/query-tests/Likely Bugs/HashedButNoHash/HashedButNoHash.expected

@@ -1,2 +1,16 @@
+#select
 | HashedButNoHash.cs:9:15:9:18 | this access | This expression is hashed, but type 'Test' only defines Equals(...) not GetHashCode(). |
-| HashedButNoHash.cs:12:15:12:18 | this access | This expression is hashed, but type 'Test' only defines Equals(...) not GetHashCode(). |
+| HashedButNoHash.cs:11:23:11:26 | this access | This expression is hashed, but type 'Test' only defines Equals(...) not GetHashCode(). |
+| HashedButNoHash.cs:19:15:19:18 | this access | This expression is hashed, but type 'Test' only defines Equals(...) not GetHashCode(). |
+| HashedButNoHash.cs:20:23:20:26 | this access | This expression is hashed, but type 'Test' only defines Equals(...) not GetHashCode(). |
+testFailures
+| HashedButNoHash.cs:10:27:10:36 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:12:25:12:34 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:13:25:13:34 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:21:26:21:35 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:22:25:22:34 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:23:32:23:41 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:24:42:24:51 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:27:23:27:32 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:28:28:28:37 | // ... | Missing result: Alert |
+| HashedButNoHash.cs:29:26:29:35 | // ... | Missing result: Alert |