diff --git a/culminating-mastermind/.editorconfig b/culminating-mastermind/.editorconfig
index 14056f7..af1f196 100644
--- a/culminating-mastermind/.editorconfig
+++ b/culminating-mastermind/.editorconfig
@@ -1,4 +1,6 @@
 root = true
 
 [*.java]
-max_line_length = 80
\ No newline at end of file
+max_line_length = 80
+indent_style = space
+indent_size = 4
diff --git a/culminating-mastermind/app/src/test/java/mastermind/CodeTest.java b/culminating-mastermind/app/src/test/java/mastermind/CodeTest.java
new file mode 100644
index 0000000..35da8dd
--- /dev/null
+++ b/culminating-mastermind/app/src/test/java/mastermind/CodeTest.java
@@ -0,0 +1,62 @@
+package mastermind;
+
+import mastermind.core.Code;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.HashMap;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+class CodeTest {
+    @Test
+    void testGenerateRandomCode() {
+        final Code randomCode = Code.generateRandomCode(List.of());
+        final int expectedCodeLength = Mastermind.CODE_LENGTH;
+        final var colorArray = randomCode.getColors();
+
+        assertEquals(expectedCodeLength, colorArray.size());
+    }
+
+    @Test
+    void testCodeFromIndices() {
+        final Code code = new Code(List.of(0, 1, 2, 3));
+        final List<Code.Color> expectedColors = List.of(Code.Color.Green, Code.Color.Red, Code.Color.Blue,
+                Code.Color.Yellow);
+
+        assertEquals(expectedColors, code.getColors());
+    }
+
+    @Test
+    void testGetColor() {
+        final Code code = new Code(List.of(0, 1, 2, 3));
+        final List<Code.Color> expectedColors = List.of(Code.Color.Green, Code.Color.Red, Code.Color.Blue,
+                Code.Color.Yellow);
+
+        for (int i = 0; i < Mastermind.CODE_LENGTH; ++i) {
+            assertEquals(expectedColors.get(i), code.getColor(i));
+        }
+    }
+
+    @Test
+    void testGetColors() {
+        final Code code = new Code(List.of(0, 1, 2, 3));
+        final List<Code.Color> expectedColors = List.of(Code.Color.Green, Code.Color.Red, Code.Color.Blue,
+                Code.Color.Yellow);
+
+        assertEquals(expectedColors, code.getColors());
+    }
+
+    @Test
+    void testGetOccurrences() {
+        final Code code = new Code(List.of(0, 1, 2, 3));
+        HashMap<Code.Color, Integer> expectedOccurrences = new HashMap<>(4);
+        expectedOccurrences.put(Code.Color.Green, 1);
+        expectedOccurrences.put(Code.Color.Red, 1);
+        expectedOccurrences.put(Code.Color.Blue, 1);
+        expectedOccurrences.put(Code.Color.Yellow, 1);
+
+        assumeTrue(code.getOccurrences().equals(expectedOccurrences));
+    }
+}