Add unit test

Signed-off-by: Olivier Perrin <olivier.perrin@rte-france.com>

open-reac/src/test/java/com/powsybl/openreac/parameters/output/ReactiveSlackOutputTest.java

@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2023, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+package com.powsybl.openreac.parameters.output;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * @author Olivier Perrin {@literal <olivier.perrin at rte-france.com>}
+ */
+class ReactiveSlackOutputTest {
+
+    @Test
+    void readTest() throws IOException {
+        ReactiveSlackOutput output = new ReactiveSlackOutput();
+        try (InputStream input = getClass().getResourceAsStream("/mock_outputs/reactiveopf_results_reactive_slacks.csv");
+             InputStreamReader in = new InputStreamReader(input);
+             BufferedReader reader = new BufferedReader(in)) {
+
+            output.read(reader, null);
+            assertEquals(2, output.getSlacks().size());
+            ReactiveSlackOutput.ReactiveSlack slack1 = output.getSlacks().get(0);
+            ReactiveSlackOutput.ReactiveSlack slack2 = output.getSlacks().get(1);
+            Assertions.assertAll(
+                    () -> assertEquals(1.6, slack1.getSlack(), 0.01),
+                    () -> assertEquals("slack1", slack1.getBusId()),
+                    () -> assertEquals("voltageLevel1", slack1.getVoltageLevelId()),
+                    () -> assertEquals(Double.NaN, slack2.getSlack()),
+                    () -> assertEquals("slack2", slack2.getBusId()),
+                    () -> assertEquals("voltageLevel2", slack2.getVoltageLevelId())
+            );
+        }
+    }
+
+}

open-reac/src/test/resources/mock_outputs/reactiveopf_results_reactive_slacks.csv

@@ -0,0 +1,3 @@
+col1;col2;col3;col4;col5;col6;
+'a1';'b1';5.3;6.9;'slack1';'voltageLevel1';
+'a2';'b2';1.2;-99999;'slack2';'voltageLevel2';