Added UTs for FileShareStore

src/test/java/org/opengroup/osdu/azure/fileshare/FileShareStoreTest.java

+package org.opengroup.osdu.azure.fileshare;
+
+import com.azure.storage.file.share.ShareClient;
+import com.azure.storage.file.share.ShareDirectoryClient;
+import com.azure.storage.file.share.ShareFileClient;
+import com.azure.storage.file.share.ShareServiceClient;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.opengroup.osdu.azure.logging.CoreLogger;
+import org.opengroup.osdu.azure.logging.CoreLoggerFactory;
+import org.opengroup.osdu.core.common.logging.ILogger;
+
+import java.io.ByteArrayInputStream;
+import java.lang.reflect.Field;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyMap;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+@ExtendWith(MockitoExtension.class)
+public class FileShareStoreTest {
+    private static final String PARTITION_ID = "dataPartitionId";
+    private static final String FILE_SHARE_NAME = "fileShareName";
+    private static final String DIRECTORY_NAME = "directoryName";
+    private static final String FILE_NAME = "fileName";
+    private static final String CONTENT = "hello world";
+
+    @Mock
+    private CoreLoggerFactory coreLoggerFactory;
+
+    @Mock
+    private CoreLogger coreLogger;
+
+    @Mock
+    private ILogger logger;
+
+    @Mock
+    private ShareFileClient fileShareFileClient;
+
+    @Mock
+    private ShareDirectoryClient fileShareDirectoryClient;
+
+    @Mock
+    private ShareClient fileShareClient;
+
+    @Mock
+    private ShareServiceClient fileShareServiceClient;
+
+    @Mock
+    private IFileShareServiceClientFactory fileShareServiceClientFactory;
+
+    @InjectMocks
+    private FileShareStore fileShareStore;
+
+    /**
+     * Workaround for inability to mock static methods like getInstance().
+     *
+     * @param mock CoreLoggerFactory mock instance
+     */
+    private void mockSingleton(CoreLoggerFactory mock) {
+        try {
+            Field instance = CoreLoggerFactory.class.getDeclaredField("instance");
+            instance.setAccessible(true);
+            instance.set(null, mock);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Reset workaround for inability to mock static methods like getInstance().
+     */
+    private void resetSingleton() {
+        try {
+            Field instance = CoreLoggerFactory.class.getDeclaredField("instance");
+            instance.setAccessible(true);
+            instance.set(null, null);
+            instance.setAccessible(false);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @BeforeEach
+    void init() {
+        initMocks(this);
+
+        mockSingleton(coreLoggerFactory);
+        when(coreLoggerFactory.getLogger(anyString())).thenReturn(coreLogger);
+
+        lenient().when(fileShareDirectoryClient.getFileClient(FILE_NAME)).thenReturn(fileShareFileClient);
+        lenient().when(fileShareClient.getDirectoryClient(DIRECTORY_NAME)).thenReturn(fileShareDirectoryClient);
+        lenient().when(fileShareServiceClient.getShareClient(FILE_SHARE_NAME)).thenReturn(fileShareClient);
+        lenient().when(fileShareServiceClientFactory.getFileShareServiceClient(PARTITION_ID)).thenReturn(fileShareServiceClient);
+        lenient().doNothing().when(logger).warning(eq("azure-core-lib"), any(), anyMap());
+    }
+
+    @AfterEach
+    public void takeDown() {
+        resetSingleton();
+    }
+
+    @Test
+    public void writeToFileShare_Success() {
+        fileShareStore.writeToFileShare(PARTITION_ID, FILE_SHARE_NAME, DIRECTORY_NAME, FILE_NAME, CONTENT);
+        ArgumentCaptor<ByteArrayInputStream> inputStream = ArgumentCaptor.forClass(ByteArrayInputStream.class);
+        // validate that the upload method is being invoked appropriately.
+        verify(fileShareFileClient).upload(inputStream.capture(), eq((long) CONTENT.getBytes().length));
+    }
+
+    @Test
+    public void deleteFromFileShare_Success() {
+        fileShareStore.deleteFromFileShare(PARTITION_ID, FILE_SHARE_NAME, DIRECTORY_NAME, FILE_NAME);
+        // validate that the delete method is being invoked appropriately.
+        verify(fileShareFileClient).delete();
+    }
+}