Added FileHandlerTest

Added positive tests for the methods in FileHandler.

millions/src/test/java/no/ntnu/gruppe53/FileHandlerTest.java

@@ -0,0 +1,90 @@
+package no.ntnu.gruppe53;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+
+import static no.ntnu.gruppe53.FileHandler.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+class FileHandlerTest {
+    @Test
+    void writeTest() throws IOException {
+        String filePathString = System.getProperty("user.dir") + "\\target\\test-output\\";
+        String fileName = "stockTest.csv";
+
+
+        String symbol1 = "AAPL";
+        String company1 = "Apple Inc.";
+        BigDecimal price1 = new BigDecimal("100");
+
+        String symbol2 = "NVDA";
+        String company2 = "Nvidia";
+        BigDecimal price2 = new BigDecimal("191.27");
+
+        Stock testStock1 = new Stock(symbol1,company1, price1);
+        Stock testStock2 = new Stock(symbol2, company2, price2);
+
+        List<Stock> stockList = new ArrayList<>();
+        stockList.add(testStock1);
+        stockList.add(testStock2);
+
+        writeStocksToFile(stockList, filePathString, fileName);
+
+        List<String> lines = Files.readAllLines(Paths.get(filePathString + fileName));
+
+        assertTrue(Files.exists(Paths.get(filePathString + fileName)),
+                "File should have been created successfully.");
+        assertEquals("#Ticker,Name,Price",lines.getFirst(), "First line " +
+                "should contain correct headers.");
+        assertEquals("", lines.get(1), "Second line should be empty.");
+        assertEquals(symbol1 + "," + company1 + "," + price1, lines.get(2),
+                "Third line should contain correct values for first stock.");
+        assertEquals(symbol2 + "," + company2 + "," + price2, lines.getLast(),
+                "Last line should contain correct values for second stock.");
+    }
+
+    @Test
+    void readTest() {
+        String filePathString = System.getProperty("user.dir") + "\\target\\test-output\\";
+        String fileName = "stockTest.csv";
+
+
+        String symbol1 = "AAPL";
+        String company1 = "Apple Inc.";
+        BigDecimal price1 = new BigDecimal("100");
+
+        String symbol2 = "NVDA";
+        String company2 = "Nvidia";
+        BigDecimal price2 = new BigDecimal("191.27");
+
+        Stock testStock1 = new Stock(symbol1,company1, price1);
+        Stock testStock2 = new Stock(symbol2, company2, price2);
+
+        List<Stock> stockList = new ArrayList<>();
+        stockList.add(testStock1);
+        stockList.add(testStock2);
+
+        writeStocksToFile(stockList, filePathString, fileName);
+
+        List <Stock> readStocks = readStocksFromFile(filePathString, fileName);
+
+        assertEquals(symbol1, readStocks.getFirst().getSymbol(),
+                "First stock's symbol should be AAPL.");
+        assertEquals(company1, readStocks.getFirst().getCompany(),
+                "First stock's company name should be Apple Inc.");
+        assertEquals(0, price1.compareTo(readStocks.getFirst().getSalesPrice()),
+                "First stock's price should be 100.");
+        assertEquals(symbol2, readStocks.getLast().getSymbol(),
+                "Second stock's symbol should be NVDA.");
+        assertEquals(company2, readStocks.getLast().getCompany(),
+                "Second stock's company name should be Nvidia.");
+        assertEquals(0, price2.compareTo(readStocks.getLast().getSalesPrice()),
+                "Second stock's price should be 191.27");
+    }
+}