1 files changed, 98 insertions, 0 deletions
diff --git a/src/lib/cc/tests/data_file_unittests.cc b/src/lib/cc/tests/data_file_unittests.cc
new file mode 100644
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+++ b/src/lib/cc/tests/data_file_unittests.cc
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+// Copyright (C) 2014-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <exceptions/exceptions.h>
+#include <gtest/gtest.h>
+#include <cc/data.h>
+#include <fstream>
+
+using namespace isc;
+using namespace isc::data;
+
+namespace {
+
+/// @brief Test class for testing Daemon class
+class DataFileTest : public ::testing::Test {
+public:
+
+    /// @brief writes specified text to a file
+    ///
+    /// That is an auxiliary function used in fileRead() tests.
+    ///
+    /// @param content text to be written to disk
+    void writeFile(const std::string& content) {
+        // Write sample content to disk
+        static_cast<void>(remove(TEMP_FILE));
+        std::ofstream write_me(TEMP_FILE);
+        EXPECT_TRUE(write_me.is_open());
+        write_me << content;
+        write_me.close();
+    }
+
+    /// destructor
+    ~DataFileTest() {
+        static_cast<void>(remove(TEMP_FILE));
+    }
+
+    /// Name of the temporary file
+    static const char* TEMP_FILE;
+};
+
+/// Temporary file name used in some tests
+const char* DataFileTest::TEMP_FILE="temp-file.json";
+
+// Test checks whether a text file can be read from disk.
+TEST_F(DataFileTest, readFileMultiline) {
+
+    const char* no_endline = "{ \"abc\": 123 }";
+    const char* with_endline = "{\n \"abc\":\n 123\n }\n";
+
+    // That's what we expect
+    ElementPtr exp = Element::fromJSON(no_endline);
+
+    // Write sample content to disk
+    writeFile(no_endline);
+
+    // Check that the read content is correct
+    EXPECT_TRUE(exp->equals(*Element::fromJSONFile(TEMP_FILE)));
+
+    // Write sample content to disk
+    writeFile(with_endline);
+
+    // Check that the read content is correct
+    EXPECT_TRUE(exp->equals(*Element::fromJSONFile(TEMP_FILE)));
+}
+
+// Test checks whether comments in file are ignored as expected.
+TEST_F(DataFileTest, readFileComments) {
+    const char* commented_content = "# This is a comment\n"
+        "{ \"abc\":\n"
+        "# a comment comment\n"
+        "1 }\n";
+
+    // That's what we expect
+    ElementPtr exp = Element::fromJSON("{ \"abc\": 1 }");
+
+    // Write sample content to disk
+    writeFile(commented_content);
+
+    // Check that the read will fail (without comment elimination)
+    EXPECT_THROW(Element::fromJSONFile(TEMP_FILE), JSONError);
+
+    // Check that the read content is correct (with comment elimination)
+    EXPECT_NO_THROW(Element::fromJSONFile(TEMP_FILE, true));
+    EXPECT_TRUE(exp->equals(*Element::fromJSONFile(TEMP_FILE, true)));
+}
+
+// This test checks that missing file will generate an exception.
+TEST_F(DataFileTest, readFileError) {
+
+    // Check that the read content is correct
+    EXPECT_THROW(Element::fromJSONFile("no-such-file.txt"), isc::InvalidOperation);
+}
+
+};