refactor: InverseOfMatrix (#5446)

refactor: InverseOfMatrix

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

@@ -0,0 +1,28 @@
+package com.thealgorithms.misc;
+
+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");
+        }
+    }
+}