add unittest for useless_initializer check

Author: ricardaxel

src/dscanner/analysis/useless_initializer.d

@@ -368,6 +368,17 @@ public:
 		NotKnown nk = NotKnown.init;
 	}, sac);
 
+	// passes
+	assertAnalyzerWarnings(q{
+    	  	@("NOLINT(useless_initializer)")
+			int a = 0;
+
+    	  	@("NOLINT(useless_initializer)")
+			int f() {
+				int[] a = null;
+			}
+	}, sac);
+
 	stderr.writeln("Unittest for UselessInitializerChecker passed.");
 }