GUACAMOLE-1254: Add unit tests for unique ID generation.

src/libguac/tests/Makefile.am

@@ -36,6 +36,7 @@ TESTS = $(check_PROGRAMS)
 test_libguac_SOURCES =               \
     client/buffer_pool.c             \
     client/layer_pool.c              \
+    id/generate.c                    \
     parser/append.c                  \
     parser/read.c                    \
     pool/next_free.c                 \

src/libguac/tests/id/generate.c

@@ -0,0 +1,88 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include "id.h"
+
+#include <CUnit/CUnit.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+/**
+ * Test which verifies that each call to guac_generate_id() produces a
+ * different string.
+ */
+void test_id__unique() {
+
+    char* id1 = guac_generate_id('x');
+    char* id2 = guac_generate_id('x');
+
+    /* Neither string may be NULL */
+    CU_ASSERT_PTR_NOT_NULL_FATAL(id1);
+    CU_ASSERT_PTR_NOT_NULL_FATAL(id2);
+
+    /* Both strings should be different */
+    CU_ASSERT_STRING_NOT_EQUAL(id1, id2);
+
+    free(id1);
+    free(id2);
+
+}
+
+/**
+ * Test which verifies that guac_generate_id() produces strings are in the
+ * correc UUID-based format.
+ */
+void test_id__format() {
+
+    unsigned int ignore;
+
+    char* id = guac_generate_id('x');
+    CU_ASSERT_PTR_NOT_NULL_FATAL(id);
+
+    int items_read = sscanf(id, "x%08x-%04x-%04x-%04x-%08x%04x",
+            &ignore, &ignore, &ignore, &ignore, &ignore, &ignore);
+
+    CU_ASSERT_EQUAL(items_read, 6);
+    CU_ASSERT_EQUAL(strlen(id), 37);
+
+    free(id);
+
+}
+
+/**
+ * Test which verifies that guac_generate_id() takes the specified prefix
+ * character into account when generating the ID string.
+ */
+void test_id__prefix() {
+
+    char* id;
+    
+    id = guac_generate_id('a');
+    CU_ASSERT_PTR_NOT_NULL_FATAL(id);
+    CU_ASSERT_EQUAL(id[0], 'a');
+    free(id);
+
+    id = guac_generate_id('b');
+    CU_ASSERT_PTR_NOT_NULL_FATAL(id);
+    CU_ASSERT_EQUAL(id[0], 'b');
+    free(id);
+
+}
+