Provide tests for disabled idiom case

This case was created from issue:

avast/retdec#724

bugs/idioms-ashr/test.c

@@ -0,0 +1,21 @@
+//
+// Created from https://github.com/avast/retdec/issues/724
+// Author: adahsuzixin
+//
+
+#include <stdio.h>
+
+char getSecondByte(long long a);
+
+int main(void)
+{
+	long long a;
+	scanf("%llx", &a);
+	char res = getSecondByte(a);
+	printf("getSecondByte( %llx ) = %d\n",a,res);
+	return res;
+}
+
+char getSecondByte(long long a) {
+	return (a >> 8) & 0xff;
+}

bugs/idioms-ashr/test.py

@@ -0,0 +1,19 @@
+#
+# Created from https://github.com/avast/retdec/issues/724
+# Author: adahsuzixin
+#
+
+from regression_tests import *
+
+class TestBase(Test):
+    def test_produce_expected_output(self):
+        self.assert_c_produces_output_when_run(
+            input='0xa5a5a5a5a5a50020',
+            expected_output='getSecondByte( a5a5a5a5a5a50020 ) = 0\n',
+            expected_return_code=0
+        )
+
+class Test_shiftOrDivide(TestBase):
+    shiftOrDivide = TestSettings(
+        input=files_in_dir('2020-08-02')
+    )