Add test checking the data

jhdf/src/test/java/io/jhdf/dataset/chunked/indexing/ImplicitIndexTest.java

@@ -0,0 +1,57 @@
+/*
+ * This file is part of jHDF. A pure Java library for accessing HDF5 files.
+ *
+ * https://jhdf.io
+ *
+ * Copyright (c) 2024 James Mudd
+ *
+ * MIT License see 'LICENSE' file
+ */
+package io.jhdf.dataset.chunked.indexing;
+
+import io.jhdf.HdfFile;
+import io.jhdf.api.Dataset;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import static io.jhdf.TestUtils.loadTestHdfFile;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+class ImplicitIndexTest {
+
+	private static final String HDF5_TEST_FILE_NAME = "implicit_index_datasets.hdf5";
+
+	private static HdfFile hdfFile;
+
+	@BeforeAll
+	static void setup() throws Exception {
+		hdfFile = loadTestHdfFile(HDF5_TEST_FILE_NAME);
+	}
+
+	@AfterAll
+	static void tearDown() {
+		hdfFile.close();
+	}
+
+	@Test
+	void testDataReadCorrectly() {
+		// Unfiltered
+		Dataset implicitIndex = hdfFile.getDatasetByPath("implicit_index_exact");
+		int[] implicitIndexDataFlat = (int[]) implicitIndex.getDataFlat();
+		assertThat(implicitIndexDataFlat).isEqualTo(expectedData(Math.toIntExact(implicitIndex.getSize())));
+
+		Dataset indexMismatch = hdfFile.getDatasetByPath("implicit_index_mismatch");
+		int[] indexMismatchDataFlat = (int[]) indexMismatch.getDataFlat();
+		assertThat(indexMismatchDataFlat).isEqualTo(expectedData(Math.toIntExact(indexMismatch.getSize())));
+
+	}
+
+	private int[] expectedData(int length) {
+		int[] data = new int[length];
+		for (int i = 0; i < length; i++) {
+			data[i] = i;
+		}
+		return data;
+	}
+}