Add test for cooccurrence Matrix script.

- Add a small test data containing diffrent charactors to check proper text preprocessing.
- The test checks the result of the cooccurrenceMatrix.dml for this small
  dataset.

src/test/java/org/apache/sysds/test/functions/builtin/part1/BuiltinCooccurrenceMatrixTest.java

@@ -0,0 +1,71 @@
+package org.apache.sysds.test.functions.builtin.part1;
+
+import org.apache.sysds.common.Types;
+import org.apache.sysds.runtime.matrix.data.MatrixValue;
+import org.apache.sysds.test.AutomatedTestBase;
+import org.apache.sysds.test.TestConfiguration;
+import org.apache.sysds.test.TestUtils;
+import org.junit.Test;
+
+import java.util.HashMap;
+
+public class BuiltinCooccurrenceMatrixTest extends AutomatedTestBase {
+
+    private static final String TEST_NAME = "cooccurrenceMatrix";
+    private static final String TEST_DIR = "functions/builtin/";
+    private static final String RESOURCE_DIRECTORY = "src/test/resources/datasets/";
+    private static final String TEST_CLASS_DIR = TEST_DIR + BuiltinCooccurrenceMatrixTest.class.getSimpleName() + "/";
+    private static final double EPSILON = 1e-10; // Tolerance for comparison
+
+    @Override
+    public void setUp() {
+        addTestConfiguration(TEST_NAME,new TestConfiguration(TEST_CLASS_DIR, TEST_NAME,new String[]{"TestResult",}));
+    }
+
+    @Test
+    public void cooccurrenceMatrixTest() {
+        runCooccurrenceMatrix(20, 2, "FALSE", "TRUE");
+        HashMap<MatrixValue.CellIndex, Double> cooccurrenceMatrix = readDMLMatrixFromOutputDir("TestResult");
+        double[][] computedC = TestUtils.convertHashMapToDoubleArray(cooccurrenceMatrix);
+
+        // Unique words: {apple, banana, orange, grape}
+        // Co-occurrence based on word pairs in same sentences
+        double[][] expectedC = new double[][] {
+                {0, 1, 2, 0},  // apple with {banana, orange}
+                {1, 0, 3, 1},  // banana with {apple, orange, grape}
+                {2, 3, 0, 2},  // orange with {apple, banana, grape}
+                {0, 1, 2, 0}   // grape with {banana, orange, grape}
+        };
+
+        TestUtils.compareMatrices(expectedC, computedC, expectedC.length, expectedC[0].length, EPSILON);
+
+    }
+
+    public void runCooccurrenceMatrix(Integer maxTokens, Integer windowSize, String distanceWeighting, String symmetric) {
+        // Load test configuration
+        Types.ExecMode platformOld = setExecMode(Types.ExecType.CP);
+        try{
+            loadTestConfiguration(getTestConfiguration(TEST_NAME));
+
+            String HOME = SCRIPT_DIR + TEST_DIR;
+
+            fullDMLScriptName = HOME + TEST_NAME + ".dml";
+
+            programArgs = new String[]{"-nvargs",
+                    "input=" + RESOURCE_DIRECTORY + "GloVe/coocMatrixTest.csv",
+                    "maxTokens=" + maxTokens,
+                    "windowSize=" + windowSize,
+                    "distanceWeighting=" + distanceWeighting,
+                    "symmetric=" + symmetric,
+                    "out_file=" + output("TestResult")};
+            System.out.println("Run dml script..");
+            runTest(true, false, null, -1);
+            System.out.println("DONE");
+        }
+        finally {
+            rtplatform = platformOld;
+        }
+    }
+
+
+}

src/test/resources/datasets/GloVe/coocMatrixTest.csv

@@ -0,0 +1,6 @@
+apple banana orange.
+banana orange grape.
+apple. orange
+grape 1111 ------ orange.
+------ <<<<<<< 1111 22222.
+banana orange

src/test/scripts/functions/builtin/cooccurrenceMatrix.dml

@@ -0,0 +1,25 @@
+#-------------------------------------------------------------
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+#-------------------------------------------------------------
+
+input = read($input, data_type="frame", format="csv", sep=",", header=FALSE);
+
+[coocMatrix,  column] = cooccurrenceMatrix(input, $maxTokens, $windowSize, $distanceWeighting, $symmetric);
+write(coocMatrix, $out_file , data_type="matrix");