Refactor files to be in correctly nested packages (#6120)

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

@@ -0,0 +1,27 @@
+package com.thealgorithms.matrix;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+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 InverseOfMatrixTest {
+
+    @ParameterizedTest
+    @MethodSource("provideTestCases")
+    void testInvert(double[][] matrix, double[][] expectedInverse) {
+        double[][] result = InverseOfMatrix.invert(matrix);
+        assertMatrixEquals(expectedInverse, result);
+    }
+
+    private static Stream<Arguments> provideTestCases() {
+        return Stream.of(Arguments.of(new double[][] {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}}, new double[][] {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}}), Arguments.of(new double[][] {{4, 7}, {2, 6}}, new double[][] {{0.6, -0.7}, {-0.2, 0.4}}));
+    }
+
+    private void assertMatrixEquals(double[][] expected, double[][] actual) {
+        for (int i = 0; i < expected.length; i++) {
+            assertArrayEquals(expected[i], actual[i], 1.0E-10, "Row " + i + " is not equal");
+        }
+    }
+}

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

@@ -0,0 +1,33 @@
+package com.thealgorithms.matrix;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+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;
+
+public class MatrixTransposeTest {
+
+    private static Stream<Arguments> provideValidMatrixTestCases() {
+        return Stream.of(Arguments.of(new int[][] {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}, new int[][] {{1, 4, 7}, {2, 5, 8}, {3, 6, 9}}, "Transpose of square matrix"), Arguments.of(new int[][] {{1, 2}, {3, 4}, {5, 6}}, new int[][] {{1, 3, 5}, {2, 4, 6}}, "Transpose of rectangular matrix"),
+            Arguments.of(new int[][] {{1, 2, 3}}, new int[][] {{1}, {2}, {3}}, "Transpose of single-row matrix"), Arguments.of(new int[][] {{1}, {2}, {3}}, new int[][] {{1, 2, 3}}, "Transpose of single-column matrix"));
+    }
+
+    private static Stream<Arguments> provideInvalidMatrixTestCases() {
+        return Stream.of(Arguments.of(new int[0][0], "Empty matrix should throw IllegalArgumentException"), Arguments.of(null, "Null matrix should throw IllegalArgumentException"));
+    }
+
+    @ParameterizedTest(name = "Test case {index}: {2}")
+    @MethodSource("provideValidMatrixTestCases")
+    void testValidMatrixTranspose(int[][] input, int[][] expected, String description) {
+        assertArrayEquals(expected, MatrixTranspose.transpose(input), description);
+    }
+
+    @ParameterizedTest(name = "Test case {index}: {1}")
+    @MethodSource("provideInvalidMatrixTestCases")
+    void testInvalidMatrixTranspose(int[][] input, String description) {
+        assertThrows(IllegalArgumentException.class, () -> MatrixTranspose.transpose(input), description);
+    }
+}

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

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+package com.thealgorithms.matrix;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+
+public class MedianOfMatrixTest {
+
+    @Test
+    public void testMedianWithOddNumberOfElements() {
+        List<List<Integer>> matrix = new ArrayList<>();
+        matrix.add(Arrays.asList(1, 3, 5));
+        matrix.add(Arrays.asList(2, 4, 6));
+        matrix.add(Arrays.asList(7, 8, 9));
+
+        int result = MedianOfMatrix.median(matrix);
+
+        assertEquals(5, result);
+    }
+
+    @Test
+    public void testMedianWithEvenNumberOfElements() {
+        List<List<Integer>> matrix = new ArrayList<>();
+        matrix.add(Arrays.asList(2, 4));
+        matrix.add(Arrays.asList(1, 3));
+
+        int result = MedianOfMatrix.median(matrix);
+
+        assertEquals(2, result);
+    }
+}

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

@@ -0,0 +1,53 @@
+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.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+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);
+        assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
+    }
+
+    @Test
+    void testMirrorMatrixEmptyMatrix() {
+        int[][] originalMatrix = {};
+        int[][] expectedMirrorMatrix = {};
+        int[][] mirroredMatrix = MirrorOfMatrix.mirrorMatrix(originalMatrix);
+        assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
+    }
+
+    @Test
+    void testMirrorMatrixSingleElementMatrix() {
+        int[][] originalMatrix = {{42}};
+        int[][] expectedMirrorMatrix = {{42}};
+        int[][] 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);
+        assertArrayEquals(expectedMirrorMatrix, mirroredMatrix);
+    }
+
+    @Test
+    void testMirrorMatrixNullInput() {
+        int[][] originalMatrix = null;
+        assertNull(MirrorOfMatrix.mirrorMatrix(originalMatrix));
+    }
+
+    @Test
+    void testMirrotMarixThrows() {
+        assertThrows(IllegalArgumentException.class, () -> MirrorOfMatrix.mirrorMatrix(new int[][] {{1}, {2, 3}}));
+    }
+}

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

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+package com.thealgorithms.matrix;
+
+import static org.junit.jupiter.api.Assertions.assertIterableEquals;
+
+import java.util.List;
+import org.junit.jupiter.api.Test;
+
+public class TestPrintMatrixInSpiralOrder {
+    @Test
+    public void testOne() {
+        int[][] matrix = {{3, 4, 5, 6, 7}, {8, 9, 10, 11, 12}, {14, 15, 16, 17, 18}, {23, 24, 25, 26, 27}, {30, 31, 32, 33, 34}};
+        var printClass = new PrintAMatrixInSpiralOrder();
+        List<Integer> res = printClass.print(matrix, matrix.length, matrix[0].length);
+        List<Integer> list = List.of(3, 4, 5, 6, 7, 12, 18, 27, 34, 33, 32, 31, 30, 23, 14, 8, 9, 10, 11, 17, 26, 25, 24, 15, 16);
+        assertIterableEquals(res, list);
+    }
+
+    @Test
+    public void testTwo() {
+        int[][] matrix = {{2, 2}};
+        var printClass = new PrintAMatrixInSpiralOrder();
+        List<Integer> res = printClass.print(matrix, matrix.length, matrix[0].length);
+        List<Integer> list = List.of(2, 2);
+        assertIterableEquals(res, list);
+    }
+}