EastridgeInterview

src/main/java/com/github/archarithms/App.java

@@ -1,15 +1,45 @@
 package com.github.archarithms;
 
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.TimeZone;
 
+/**
+ * Arcarithm Coding Interview
+ * Christopher Eastridge
+ * 7/20/2022
+ */
 public class App
 {
-  public static String convertToTitleCase(final String inpStr)
-  {
-    return inpStr;
-  }
-
-  public static String convertUnixToDateString(final Long inpUnixSeconds)
-  {
-    return String.valueOf(inpUnixSeconds);
-  }
+    /**
+     * Converts a string to UPPER-CASE
+     *
+     * @param inpStr The string you want to UPPER-CASE
+     * @return The string as UPPER-CASE
+     */
+    public static String convertToTitleCase(final String inpStr)
+    {
+        return inpStr.toUpperCase();
+    }
+
+    /**
+     * Converts Unix timestamp to a human-readable format
+     *
+     * @param inpUnixSeconds seconds since epoch
+     * @param timeZone       the time zone for the expected conversion
+     * @return a human-readable date format
+     */
+    public static String convertUnixToDateString(final Long inpUnixSeconds, String timeZone)
+    {
+        // Convert seconds to milliseconds
+        Date date = new Date(inpUnixSeconds * 1000L);
+
+        // Provide the format we want the resulting string in
+        SimpleDateFormat dateFormat = new SimpleDateFormat("MMMM d, yyyy");
+
+        // Get this date in EST
+        dateFormat.setTimeZone(TimeZone.getTimeZone(timeZone));
+
+        return dateFormat.format(date);
+    }
 }

src/test/java/com/github/archarithms/test/DateStringTests.java

@@ -1,36 +1,44 @@
 package com.github.archarithms.test;
 
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-
+import com.github.archarithms.App;
 import org.junit.jupiter.api.Test;
 
-import com.github.archarithms.App;
+import static org.junit.jupiter.api.Assertions.*;
 
 /**
  * DateStringTests unit tests for simple App.
  */
 public class DateStringTests
 {
-
-    /*
-     * UNCOMMENT THE UNIT TESTS TO RUN THEM. FEEL FREE TO ADD MORE!
-     */
-
     /**
      * Test the testConvertUnixToDateString method
      */
     @Test
-    public void testConvertUnixToDateString() {
+    public void testConvertUnixToDateString_Nominal()
+    {
         String testStr = "July 4, 2017";
-        assertTrue(testStr.equals(App.convertUnixToDateString(1499144400L)));
+        assertEquals(testStr, App.convertUnixToDateString(1499144400L, "GMT-5"));
+    }
+
+    /**
+     * Test the testConvertUnixToDateString method for mismatched time zone
+     */
+    @Test
+    public void testConvertUnixToDateString_TimeZoneMismatch()
+    {
+        String pstTimeStr = "July 3, 2017";
+        String estTimeStr = "July 4, 2017";
+        String convertedStr = App.convertUnixToDateString(1499144400L, "GMT-8");
+        assertEquals(pstTimeStr, convertedStr);
+        assertNotEquals(estTimeStr, convertedStr);
     }
 
     /**
-     * Test the testNullCase method
+     * Test the testConvertUnixToDateString method throws an exception for null cases
      */
     @Test
-    public void testNullCase() {
-        assertThrows(Exception.class, () -> App.convertUnixToDateString(null));
+    public void testConvertUnixToDateString_Null_ThrowsException()
+    {
+        assertThrows(Exception.class, () -> App.convertUnixToDateString(null, "GMT-5"));
     }
 }

src/test/java/com/github/archarithms/test/TitleCaseTests.java

@@ -1,45 +1,77 @@
 package com.github.archarithms.test;
 
-import static org.junit.jupiter.api.Assertions.assertTrue;
-
+import com.github.archarithms.App;
 import org.junit.jupiter.api.Test;
 
-import com.github.archarithms.App;
+import static org.junit.jupiter.api.Assertions.*;
 
 /**
  * TitleCaseTests unit tests for simple App.
  */
 public class TitleCaseTests
 {
-
-    /*
-     * UNCOMMENT THE UNIT TESTS TO RUN THEM. FEEL FREE TO ADD MORE!
-     */
-
     /**
      * Test the testConvertToTitleCase method
      */
     @Test
-    public void testConvertToTitleCase() {
+    public void testConvertToTitleCase_Nominal()
+    {
         String testStr = "Title Case";
-        assertTrue(testStr.equals(App.convertToTitleCase("TITLE_CASE")));
+        assertEquals("TITLE CASE", App.convertToTitleCase(testStr));
     }
 
     /**
-     * Test the testNumbers method
+     * Test that upper-casing works with number literals
      */
     @Test
-    public void testNumbers() {
+    public void testConvertToTitleCase_Numbers()
+    {
         String testStr = "Number 3";
-        assertTrue(testStr.equals(App.convertToTitleCase("NUMBER_3")));
+        assertEquals("NUMBER 3", App.convertToTitleCase(testStr));
+
+    }
+
+    /**
+     * Test that upper-casing works with different characters
+     */
+    @Test
+    public void testConvertToTitleCase_OtherChars()
+    {
+        String testStr = "Truth-Track";
+        assertEquals("TRUTH-TRACK", App.convertToTitleCase(testStr));
+
+    }
+
+    /**
+     * Test that upper-casing will preserve whitespace.
+     */
+    @Test
+    public void testConvertToTitleCase_WhiteSpace()
+    {
+        String testStr = "   test  ";
+        assertEquals("   TEST  ", App.convertToTitleCase(testStr));
+
+        // Verify equals isn't trimming or eliminating whitespace
+        assertNotEquals("TEST", App.convertToTitleCase(testStr));
+    }
+
+    /**
+     * Test that upper-casing works with empty String.
+     */
+    @Test
+    public void testConvertToTitleCase_Empty()
+    {
+        String testStr = "";
+        assertEquals("", App.convertToTitleCase(testStr));
     }
 
     /**
-     * Test the testOtherChars method
+     * Test that an exception is thrown for null values.
      */
     @Test
-    public void testOtherChars() {
-        String testStr = "Truth Track";
-        assertTrue(testStr.equals(App.convertToTitleCase("TRUTH-TRACK")));
+    public void testConvertToTitleCase_Null_ThrowsException()
+    {
+        String testStr = "";
+        assertThrows(Exception.class, () -> App.convertToTitleCase(null));
     }
 }