Improved test coverage for better Codecov scores.

src/test/java/com/thealgorithms/others/MosAlgorithmTest.java

@@ -2,7 +2,10 @@
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
 import org.junit.jupiter.api.Test;
 
 /**
@@ -175,4 +178,25 @@ void testRangeFrequencyWithDuplicates() {
 
         assertArrayEquals(expected, results);
     }
+
+    @Test
+    void testMainMethod() {
+        // Capture System.out
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        PrintStream originalOut = System.out;
+        System.setOut(new PrintStream(outputStream));
+
+        try {
+            // Test main method
+            MosAlgorithm.main(new String[]{});
+            String output = outputStream.toString();
+
+            // Verify expected output contains demonstration
+            assertTrue(output.contains("Range Sum Queries Results:"));
+            assertTrue(output.contains("Range Frequency Queries Results:"));
+            assertTrue(output.contains("Count of 2 in ranges:"));
+        } finally {
+            System.setOut(originalOut);
+        }
+    }
 }

src/test/java/com/thealgorithms/recursion/DiceThrowerTest.java

@@ -4,6 +4,8 @@
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
 import java.util.List;
 import org.junit.jupiter.api.Test;
 
@@ -124,4 +126,98 @@ void testAllCombinationsValid() {
             assertEquals(5, sum, "Combination " + combination + " does not sum to 5");
         }
     }
+
+    @Test
+    void testPrintDiceCombinations() {
+        // Capture System.out
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        PrintStream originalOut = System.out;
+        System.setOut(new PrintStream(outputStream));
+
+        try {
+            // Test printing combinations for target 3
+            DiceThrower.printDiceCombinations(3);
+            String output = outputStream.toString();
+
+            // Verify all expected combinations are printed
+            assertTrue(output.contains("111"));
+            assertTrue(output.contains("12"));
+            assertTrue(output.contains("21"));
+            assertTrue(output.contains("3"));
+
+            // Count number of lines (combinations)
+            String[] lines = output.trim().split("\n");
+            assertEquals(4, lines.length);
+        } finally {
+            // Restore System.out
+            System.setOut(originalOut);
+        }
+    }
+
+    @Test
+    void testPrintDiceCombinationsZero() {
+        // Capture System.out
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        PrintStream originalOut = System.out;
+        System.setOut(new PrintStream(outputStream));
+
+        try {
+            DiceThrower.printDiceCombinations(0);
+            String output = outputStream.toString();
+
+            // Should print empty string (one line)
+            assertEquals("", output.trim());
+        } finally {
+            System.setOut(originalOut);
+        }
+    }
+
+    @Test
+    void testMainMethod() {
+        // Capture System.out
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        PrintStream originalOut = System.out;
+        System.setOut(new PrintStream(outputStream));
+
+        try {
+            // Test main method
+            DiceThrower.main(new String[]{});
+            String output = outputStream.toString();
+
+            // Verify expected output contains header and combinations
+            assertTrue(output.contains("All dice combinations that sum to 4:"));
+            assertTrue(output.contains("Total combinations: 8"));
+            assertTrue(output.contains("1111"));
+            assertTrue(output.contains("22"));
+            assertTrue(output.contains("4"));
+        } finally {
+            System.setOut(originalOut);
+        }
+    }
+
+    @Test
+    void testEdgeCaseTargetFive() {
+        List<String> result = DiceThrower.getDiceCombinations(5);
+        assertEquals(16, result.size());
+
+        // Test specific combinations exist
+        assertTrue(result.contains("11111"));
+        assertTrue(result.contains("1112"));
+        assertTrue(result.contains("122"));
+        assertTrue(result.contains("14"));
+        assertTrue(result.contains("23"));
+        assertTrue(result.contains("5"));
+    }
+
+    @Test
+    void testTargetGreaterThanSix() {
+        List<String> result = DiceThrower.getDiceCombinations(8);
+        assertTrue(result.size() > 0);
+
+        // Verify some expected combinations
+        assertTrue(result.contains("62"));
+        assertTrue(result.contains("53"));
+        assertTrue(result.contains("44"));
+        assertTrue(result.contains("2222"));
+    }
 }