parser: add test for when slash should not be filtered

According to commit cce5bd6e95, the
apparmor_parser does not collapse consecutive / characters in the
beginning of paths, since it indicates posix namespaces. Add a
equality test to make sure we maintain this behavior.

Signed-off-by: Georgia Garcia <georgia.garcia@canonical.com>

parser/tst/equality.sh

@@ -1220,6 +1220,22 @@ run_tests()
 				"@{BAR}=bin/   \#value
 					/t { /@{BAR} r, }"
 
+	# // at the beginning of the variable contents should not be filtered
+	verify_binary_equality "// in the beginning of variable content" \
+				"/t //bin/foo { }" \
+				"/t //bin//foo { }" \
+				"@{BAR}=/bin/
+					/t /@{BAR}/foo { }" \
+				"@{FOO}=/foo
+					/t //bin/@{FOO} { }" \
+				"@{BAR}=/bin/
+				 @{FOO}=/foo
+					/t /@{BAR}/@{FOO} { }" \
+				"@{BAR}=/bin/
+				 @{FOO}=/foo
+				 @{ROOT}=/
+					/t @{ROOT}@{BAR}/@{FOO} { }"
+
 	test_parser_variables
 
 	# verify combinations of different priority levels