Add unit test suites (#3490)

tests/unit/running-modes/wasm-apps/hello.c

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2019 Intel Corporation. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+double
+foo(double d)
+{
+    return d / 3.0;
+}
+
+double
+maybe_min(double d, double e)
+{
+    return d < e ? d : e;
+}
+
+double
+factor(double a, double b, double c)
+{
+    return (a * c) + (b * c);
+}
+
+int
+echo(int a)
+{
+    double b = foo(14.5);
+    double c = maybe_min(12.2, 15.4);
+    double d = factor(a, b, c);
+    return 2 * a;
+}