Create package prime, matrix and games (#6139)

src/test/java/com/thealgorithms/matrix/MatrixRankTest.java

@@ -0,0 +1,45 @@
+package com.thealgorithms.matrix;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.Arrays;
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class MatrixRankTest {
+
+    private static Stream<Arguments> validInputStream() {
+        return Stream.of(Arguments.of(3, new double[][] {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}}), Arguments.of(0, new double[][] {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}}), Arguments.of(1, new double[][] {{1}}), Arguments.of(2, new double[][] {{1, 2}, {3, 4}}),
+            Arguments.of(2, new double[][] {{3, -1, 2}, {-3, 1, 2}, {-6, 2, 4}}), Arguments.of(3, new double[][] {{2, 3, 0, 1}, {1, 0, 1, 2}, {-1, 1, 1, -2}, {1, 5, 3, -1}}), Arguments.of(1, new double[][] {{1, 2, 3}, {3, 6, 9}}),
+            Arguments.of(2, new double[][] {{0.25, 0.5, 0.75, 2}, {1.5, 3, 4.5, 6}, {1, 2, 3, 4}}));
+    }
+
+    private static Stream<Arguments> invalidInputStream() {
+        return Stream.of(Arguments.of((Object) new double[][] {{1, 2}, {10}, {100, 200, 300}}), // jagged array
+            Arguments.of((Object) new double[][] {}), // empty matrix
+            Arguments.of((Object) new double[][] {{}, {}}), // empty row
+            Arguments.of((Object) null), // null matrix
+            Arguments.of((Object) new double[][] {{1, 2}, null}) // null row
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("validInputStream")
+    void computeRankTests(int expectedRank, double[][] matrix) {
+        int originalHashCode = Arrays.deepHashCode(matrix);
+        int rank = MatrixRank.computeRank(matrix);
+        int newHashCode = Arrays.deepHashCode(matrix);
+
+        assertEquals(expectedRank, rank);
+        assertEquals(originalHashCode, newHashCode);
+    }
+
+    @ParameterizedTest
+    @MethodSource("invalidInputStream")
+    void computeRankWithInvalidMatrix(double[][] matrix) {
+        assertThrows(IllegalArgumentException.class, () -> MatrixRank.computeRank(matrix));
+    }
+}

src/test/java/com/thealgorithms/matrix/MatrixUtilTest.java

@@ -0,0 +1,80 @@
+package com.thealgorithms.matrix;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import com.thealgorithms.matrix.utils.MatrixUtil;
+import java.math.BigDecimal;
+import java.util.Objects;
+import org.junit.jupiter.api.Test;
+
+class MatrixUtilTest {
+
+    @Test
+    void add() {
+        final BigDecimal[][] matrix1 = {
+            {new BigDecimal(3), BigDecimal.TWO},
+            {BigDecimal.ZERO, BigDecimal.ONE},
+        };
+
+        final BigDecimal[][] matrix2 = {
+            {BigDecimal.ONE, new BigDecimal(3)},
+            {BigDecimal.TWO, BigDecimal.ZERO},
+        };
+
+        final BigDecimal[][] actual = MatrixUtil.add(matrix1, matrix2).orElseThrow(() -> new AssertionError("Could not compute matrix!"));
+
+        final BigDecimal[][] expected = {
+            {new BigDecimal(4), new BigDecimal(5)},
+            {BigDecimal.TWO, BigDecimal.ONE},
+        };
+
+        assertTrue(Objects.deepEquals(actual, expected));
+    }
+    @Test
+    void subtract() {
+        final BigDecimal[][] matrix1 = {
+            {BigDecimal.ONE, new BigDecimal(4)},
+            {new BigDecimal(5), new BigDecimal(6)},
+        };
+
+        final BigDecimal[][] matrix2 = {
+            {BigDecimal.TWO, BigDecimal.ZERO},
+            {new BigDecimal(-2), new BigDecimal(-3)},
+        };
+
+        final BigDecimal[][] actual = MatrixUtil.subtract(matrix1, matrix2).orElseThrow(() -> new AssertionError("Could not compute matrix!"));
+
+        final BigDecimal[][] expected = {
+            {new BigDecimal(-1), new BigDecimal(4)},
+            {new BigDecimal(7), new BigDecimal(9)},
+        };
+
+        assertTrue(Objects.deepEquals(actual, expected));
+    }
+
+    @Test
+    void multiply() {
+
+        final BigDecimal[][] matrix1 = {
+            {BigDecimal.ONE, BigDecimal.TWO, new BigDecimal(3)},
+            {new BigDecimal(4), new BigDecimal(5), new BigDecimal(6)},
+            {new BigDecimal(7), new BigDecimal(8), new BigDecimal(9)},
+        };
+
+        final BigDecimal[][] matrix2 = {
+            {BigDecimal.ONE, BigDecimal.TWO},
+            {new BigDecimal(3), new BigDecimal(4)},
+            {new BigDecimal(5), new BigDecimal(6)},
+        };
+
+        final BigDecimal[][] actual = MatrixUtil.multiply(matrix1, matrix2).orElseThrow(() -> new AssertionError("Could not compute matrix!"));
+
+        final BigDecimal[][] expected = {
+            {new BigDecimal(22), new BigDecimal(28)},
+            {new BigDecimal(49), new BigDecimal(64)},
+            {new BigDecimal(76), new BigDecimal(100)},
+        };
+
+        assertTrue(Objects.deepEquals(actual, expected));
+    }
+}

src/test/java/com/thealgorithms/matrix/MirrorOfMatrixTest.java

@@ -1,7 +1,7 @@
 package com.thealgorithms.matrix;
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
-import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import org.junit.jupiter.api.Test;
@@ -10,44 +10,44 @@ class MirrorOfMatrixTest {
 
     @Test
     void testMirrorMatrixRegularMatrix() {
-        int[][] originalMatrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
-        int[][] expectedMirrorMatrix = {{3, 2, 1}, {6, 5, 4}, {9, 8, 7}};
-        int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
+        double[][] originalMatrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
+        double[][] expectedMirrorMatrix = {{3, 2, 1}, {6, 5, 4}, {9, 8, 7}};
+        double[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
         assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
     }
 
     @Test
     void testMirrorMatrixEmptyMatrix() {
-        int[][] originalMatrix = {};
-        int[][] expectedMirrorMatrix = {};
-        int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
-        assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
+        double[][] originalMatrix = {};
+        Exception e = assertThrows(IllegalArgumentException.class, () -> MirrorOfMatrix.mirrorMatrix(originalMatrix));
+        assertEquals("The input matrix cannot be empty", e.getMessage());
     }
 
     @Test
     void testMirrorMatrixSingleElementMatrix() {
-        int[][] originalMatrix = {{42}};
-        int[][] expectedMirrorMatrix = {{42}};
-        int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
+        double[][] originalMatrix = {{42}};
+        double[][] expectedMirrorMatrix = {{42}};
+        double[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
         assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
     }
 
     @Test
     void testMirrorMatrixMultipleRowsOneColumnMatrix() {
-        int[][] originalMatrix = {{1}, {2}, {3}, {4}};
-        int[][] expectedMirrorMatrix = {{1}, {2}, {3}, {4}};
-        int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
+        double[][] originalMatrix = {{1}, {2}, {3}, {4}};
+        double[][] expectedMirrorMatrix = {{1}, {2}, {3}, {4}};
+        double[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
         assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
     }
 
     @Test
     void testMirrorMatrixNullInput() {
-        int[][] originalMatrix = null;
-        assertNull(MirrorOfMatrix.mirrorMatrix(originalMatrix));
+        double[][] originalMatrix = null;
+        Exception e = assertThrows(IllegalArgumentException.class, () -> MirrorOfMatrix.mirrorMatrix(originalMatrix));
+        assertEquals("The input matrix cannot be null", e.getMessage());
     }
 
     @Test
-    void testMirrotMarixThrows() {
-        assertThrows(IllegalArgumentException.class, () -> MirrorOfMatrix.mirrorMatrix(new int[][] {{1}, {2, 3}}));
+    void testMirrorMatrixThrows() {
+        assertThrows(IllegalArgumentException.class, () -> MirrorOfMatrix.mirrorMatrix(new double[][] {{1}, {2, 3}}));
     }
 }