[SYSTEMDS-3842] Improve test coverage of API components: MLContext

Closes #2262.

Author: e-strauss

.github/workflows/python.yml

@@ -118,7 +118,7 @@ jobs:
           black \
           opt-einsum \
           nltk
-        
+
     - name: Build Python Package
       run: |
         cd src/main/python

src/test/java/org/apache/sysds/test/functions/mlcontext/MLContextTest.java

@@ -57,6 +57,7 @@
 import org.apache.spark.sql.types.DoubleType;
 import org.apache.spark.sql.types.StructField;
 import org.apache.spark.sql.types.StructType;
+import org.apache.sysds.api.mlcontext.MLContext;
 import org.apache.sysds.api.mlcontext.MLContextConversionUtil;
 import org.apache.sysds.api.mlcontext.MLContextException;
 import org.apache.sysds.api.mlcontext.MLContextUtil;
@@ -1964,4 +1965,28 @@ public void testNNImport() {
 			.getScalarObject("R").getDoubleValue();
 		Assert.assertEquals(1000, ret, 1e-20);
 	}
+
+	@Test
+	public void testMLContextExecuteWithExplainType() {
+		LOG.debug("MLContextTest - test getter / setter");
+		ml.setExplain(true);
+		String s = "print(\"Hello World!\")";
+		for (MLContext.ExplainLevel el : MLContext.ExplainLevel.values()) {
+			ml.setExplainLevel(el);
+			String out  = executeAndCaptureStdOut(dml(s)).getRight();
+			String[] lines = out.split("\n");
+			Assert.assertTrue(lines[0].contains(el.getExplainType().toString()));
+		}
+	}
+
+	@Test
+	public void testMLContextExecuteWithExecutionType() {
+		LOG.debug("MLContextTest - test getter / setter");
+		ml.setExplain(false);
+		String s = "print(\"Hello World!\")";
+		for (MLContext.ExecutionType et : MLContext.ExecutionType.values()) {
+			ml.setExecutionType(et);
+			ml.execute(dml(s));
+		}
+	}
 }