[apex] Add test case, refs #776

Note: only solution right now is supressing the rule for the string.

pmd-apex/src/test/resources/net/sourceforge/pmd/lang/apex/rule/errorprone/xml/AvoidHardcodingId.xml

@@ -71,6 +71,23 @@ public class Foo {
 	void foo() {
 		return '001A0000006Vm9uIAE';
 	}
+}
+		]]></code>
+	</test-code>
+
+    <test-code>
+        <description>[apex] AvoidHardcodingId false positives #776</description>
+        <expected-problems>0</expected-problems>
+        <code><![CDATA[
+public class Foo {
+    void foo() {
+        // this is a false positive, we can't say, whether it's a salesforce id or not
+        @SuppressWarnings('PMD.AvoidHardcodingId')
+        String IMEI__c = '359040082913024';
+
+        // now the 6th character is non-0, definitive not a salesforce id
+        String IMEI2__c = '359041082913024';
+    }
 }
         ]]></code>
     </test-code>