diff --git a/src/tests/file-sys-add-fixed-map-api-test/file-sys-add-fixed-map-api-test.c b/src/tests/file-sys-add-fixed-map-api-test/file-sys-add-fixed-map-api-test.c
new file mode 100644
index 000000000..bd0ea7ec8
--- /dev/null
+++ b/src/tests/file-sys-add-fixed-map-api-test/file-sys-add-fixed-map-api-test.c
@@ -0,0 +1,108 @@
+/*
+ *  NASA Docket No. GSC-18,370-1, and identified as "Operating System Abstraction Layer"
+ *
+ *  Copyright (c) 2019 United States Government as represented by
+ *  the Administrator of the National Aeronautics and Space Administration.
+ *  All Rights Reserved.
+ *
+ *  Licensed 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.
+ */
+
+
+/*
+ * Filename: file-sys-add-fixed-map-api-test.c
+ *
+ * Purpose: This file contains functional tests for "osapi-FileSysAddFixedMap"
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "common_types.h"
+#include "osapi.h"
+#include "utassert.h"
+#include "uttest.h"
+#include "utbsp.h"
+
+
+/* *************************************** MAIN ************************************** */
+
+void TestFileSysAddFixedMapApi(void)
+{
+    int32 expected;
+    int32 actual;
+    uint32 fs_id;
+    char translated_path[OS_MAX_LOCAL_PATH_LEN];
+
+    /* Test for nominal inputs */
+
+    /*
+     * This test case requires a fixed virtual dir for one test case.
+     * Just map /test to a dir of the same name, relative to current dir.
+     */
+
+    expected = OS_FS_ERR_PATH_INVALID;
+    actual = OS_TranslatePath("/test/myfile.txt", translated_path);
+    UtAssert_True(actual == expected, "OS_TranslatePath() (%ld) == OS_SUCCESS", (long)actual);
+
+    expected = OS_SUCCESS;
+    actual = OS_FileSysAddFixedMap(&fs_id, "./test", "/test");
+    UtAssert_True(actual == expected, "OS_FileSysAddFixedMap() (%ld) == OS_SUCCESS", (long)actual);
+
+    expected = OS_SUCCESS;
+    actual = OS_TranslatePath("/test/myfile.txt", translated_path);
+    UtAssert_True(actual == expected, "OS_TranslatePath() (%ld) == OS_SUCCESS", (long)actual);
+
+    /* Test for invalid inputs */
+    expected = OS_ERR_NAME_TAKEN;
+    actual = OS_FileSysAddFixedMap(NULL, "./test", "/test");
+    UtAssert_True(actual == expected, "OS_FileSysAddFixedMap() (%ld) == OS_INVALID_POINTER", (long)actual);
+
+    expected = OS_INVALID_POINTER;
+    actual = OS_FileSysAddFixedMap(&fs_id, NULL, "/test");
+    UtAssert_True(actual == expected, "OS_FileSysAddFixedMap() (%ld) == OS_INVALID_POINTER", (long)actual);
+
+    expected = OS_INVALID_POINTER;
+    actual = OS_FileSysAddFixedMap(&fs_id, "./test", NULL);
+    UtAssert_True(actual == expected, "OS_FileSysAddFixedMap() (%ld) == OS_INVALID_POINTER", (long)actual);
+
+    expected = OS_INVALID_POINTER;
+    actual = OS_FileSysAddFixedMap(NULL, NULL, NULL);
+    UtAssert_True(actual == expected, "OS_FileSysAddFixedMap() (%ld) == OS_INVALID_POINTER", (long)actual);
+
+    expected = OS_INVALID_POINTER;
+    actual = OS_FileSysAddFixedMap(&fs_id, NULL, NULL);
+    UtAssert_True(actual == expected, "OS_FileSysAddFixedMap() (%ld) == OS_INVALID_POINTER", (long)actual);
+
+    expected = OS_INVALID_POINTER;
+    actual = OS_FileSysAddFixedMap(NULL, "./test", NULL);
+    UtAssert_True(actual == expected, "OS_FileSysAddFixedMap() (%ld) == OS_INVALID_POINTER", (long)actual);
+
+
+} /* end TestFileSysAddFixedMapApi */
+
+
+void UtTest_Setup(void)
+{
+    if (OS_API_Init() != OS_SUCCESS)
+    {
+        UtAssert_Abort("OS_API_Init() failed");
+    }
+
+    /*
+     * Register the test setup and check routines in UT assert
+     */
+    UtTest_Add(TestFileSysAddFixedMapApi, NULL, NULL, "TestFileSysAddFixedMapApi");
+}
+