Fix tests to not create files in repository

While we run unittests, they create files directly
inside the repository, those files are later proposed
as changes to commit.

Change-Id: Iffcb3820959f85099d3fe0ab9db1a198f8f60d78
Issue-ID: DCAEGEN2-524
Signed-off-by: PawelSzalapski <pawel.szalapski@nokia.com>

1 files changed, 84 insertions, 0 deletions

diff --git a/src/test/java/org/onap/dcae/vestest/TestingUtilities.java b/src/test/java/org/onap/dcae/vestest/TestingUtilities.java
new file mode 100644
index 00000000..43e7a84e
--- /dev/null
+++ b/src/test/java/org/onap/dcae/vestest/TestingUtilities.java
@@ -0,0 +1,84 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.ves
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. 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.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.vestest;
+
+import static java.nio.file.Files.readAllBytes;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+/**
+ * @author Pawel Szalapski (pawel.szalapski@nokia.com)
+ */
+final class TestingUtilities {
+
+    private TestingUtilities() {
+        // utility class, no objects allowed
+    }
+
+    static String correctQuotes(String s) {
+        return s.replace("'", "\"");
+    }
+
+    static JsonObject readJSONFromFile(Path path) {
+        return rethrow(() -> (JsonObject) new JsonParser().parse(new String(readAllBytes(path))));
+    }
+
+    static Path createTemporaryFile() {
+        return rethrow(() -> {
+            Path temporaryDirectory = Files.createTempDirectory("temporaryDirectory");
+            Path temporaryFile = TestingUtilities.createFile(temporaryDirectory + "/testFile");
+            TestingUtilities.scheduleToBeDeletedAfterTests(temporaryDirectory);
+            TestingUtilities.scheduleToBeDeletedAfterTests(temporaryFile);
+            return temporaryFile;
+        });
+    }
+
+    private static Path createFile(String path) {
+        return rethrow(() -> Files.createFile(Paths.get(path)));
+    }
+
+    private static void scheduleToBeDeletedAfterTests(Path path) {
+        path.toFile().deleteOnExit();
+    }
+
+    /**
+     * Exception in test case usually means there is something wrong, it should never be catched, but rather thrown to
+     * be handled by JUnit framework.
+     */
+    private static <T> T rethrow(CheckedSupplier<T> supplier) {
+        try {
+            return supplier.get();
+        } catch (Exception e) {
+            throw new RuntimeException();
+        }
+    }
+
+    @FunctionalInterface
+    interface CheckedSupplier<T> {
+
+        T get() throws Exception;
+    }
+
+
+}