From a7c430fa81c9e22dbce74869a0a27304da78855b Mon Sep 17 00:00:00 2001
From: Vasile Vilvoiu <vasi@vilvoiu.ro>
Date: Wed, 21 Jul 2021 18:43:02 +0300
Subject: Implement unit tests.

ColorMap, FFT, InputParser, InputReader, ValueMap, WindowFunction.

Closes #11.
---
 test/test-input-reader.cpp | 128 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 test/test-input-reader.cpp

(limited to 'test/test-input-reader.cpp')

diff --git a/test/test-input-reader.cpp b/test/test-input-reader.cpp
new file mode 100644
index 0000000..0b8b772
--- /dev/null
+++ b/test/test-input-reader.cpp
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2020-2021 Vasile Vilvoiu <vasi@vilvoiu.ro>
+ *
+ * specgram is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+#include "test.hpp"
+#include "../src/input-reader.hpp"
+#include <fstream>
+#include <random>
+#include <string>
+#include <thread>
+#include <csignal>
+
+std::vector<char> random_data(std::size_t size)
+{
+    std::vector<char> data(size);
+
+    std::random_device rd;
+    std::default_random_engine re(rd());
+    std::uniform_int_distribution<std::int8_t> ud;
+
+    for (std::size_t i = 0; i < size; i ++) {
+        data[i] = ud(re);
+    }
+
+    return data;
+}
+
+void generate_file(const std::string& temp_file_name, const std::vector<char>& buffer)
+{
+    /* dump */
+    std::ofstream file(temp_file_name, std::ios::out | std::ios::binary);
+    if (file.fail()) {
+        throw std::runtime_error("cannot open temp file " + temp_file_name);
+    }
+    file.write(buffer.data(), buffer.size());
+    file.close();
+}
+
+void check_same(const std::vector<char>& expected, const std::vector<char>& actual, std::size_t max_len_diff)
+{
+    EXPECT_GE(expected.size(), actual.size());
+    EXPECT_LE(expected.size() - actual.size(), max_len_diff);
+    for (std::size_t i = 0; i<actual.size(); i++) {
+        EXPECT_EQ(expected[i], actual[i]);
+    }
+}
+
+TEST(TestInputReader, BadParameters)
+{
+    EXPECT_THROW_MATCH(SyncInputReader(nullptr, 100),
+                       std::runtime_error, "valid stream is required");
+    EXPECT_THROW_MATCH(AsyncInputReader(nullptr, 100),
+                       std::runtime_error, "valid stream is required");
+
+    EXPECT_THROW_MATCH(SyncInputReader((std::istream *)1, 0),
+                       std::runtime_error, "block size in bytes must be positive");
+    EXPECT_THROW_MATCH(AsyncInputReader((std::istream *)1, 0),
+                       std::runtime_error, "block size in bytes must be positive");
+}
+
+TEST(TestInputReader, SyncInputReader)
+{
+    constexpr std::size_t max_block_size = 4096;
+    constexpr std::size_t memory = 4096;
+    const std::string file_name = "/dev/shm/TestInputReader_SyncInputReader.data";
+
+    auto expected = random_data(memory);
+    generate_file(file_name, expected);
+
+    for (std::size_t block_size = 1; block_size < max_block_size; block_size++) {
+        std::ifstream file(file_name, std::ios::in | std::ios::binary);
+        EXPECT_FALSE(file.fail());
+        SyncInputReader reader(&file, block_size);
+
+        std::vector<char> output;
+        output.reserve(memory);
+        while (true) {
+            auto block = reader.GetBlock();
+            if (!block.has_value()) {
+                break;
+            }
+            EXPECT_EQ((*block).size(), block_size);
+            output.insert(output.end(), (*block).begin(), (*block).end());
+        }
+        EXPECT_TRUE(reader.ReachedEOF());
+        file.close();
+
+        check_same(expected, output, block_size);
+    }
+}
+
+TEST(TestInputReader, AsyncInputReader)
+{
+    constexpr std::size_t max_block_size = 4096;
+    constexpr std::size_t memory = 4096;
+    const std::string file_name = "/dev/shm/TestInputReader_AsyncInputReader.data";
+
+    auto expected = random_data(memory);
+    generate_file(file_name, expected);
+
+    for (std::size_t block_size = 1; block_size < max_block_size; block_size++) {
+        std::ifstream file(file_name, std::ios::in | std::ios::binary);
+        EXPECT_FALSE(file.fail());
+
+        std::vector<char> output;
+        output.reserve(memory);
+
+        std::signal(SIGINT, [](int) {  }); /* SIGINT is sent to the reader thread upon destruction of AsyncInputReader */
+        { /* scope out the reader so it does not die when we close the file */
+            AsyncInputReader reader(&file, block_size);
+            while (output.size() < expected.size() - block_size) {
+                auto block = reader.GetBlock();
+                if (block.has_value()) {
+                    EXPECT_EQ((*block).size(), block_size);
+                    output.insert(output.end(), (*block).begin(), (*block).end());
+                }
+            }
+            EXPECT_FALSE(reader.ReachedEOF());
+        }
+        std::signal(SIGINT, nullptr);
+
+        file.close();
+
+        check_same(expected, output, block_size);
+    }
+}
\ No newline at end of file
-- 
cgit v1.2.3