[MINOR][TESTS] Added flags to toggle GPU and stats from command line.…

… Also:

* Used EXCEPTION_EXPECTED instead of "true" with one test case because it makes the code clearer and silences a warning.

pom.xml

@@ -53,6 +53,7 @@
 		<jacoco.skip>true</jacoco.skip>
 		<automatedtestbase.outputbuffering>false</automatedtestbase.outputbuffering>
 		<argLine>-Xms4g -Xmx4g -Xmn400m</argLine>
+		<enableStats>false</enableStats>
 	</properties>
 
 	<repositories>

src/test/java/org/apache/sysds/test/AutomatedTestBase.java

@@ -99,7 +99,7 @@ public abstract class AutomatedTestBase {
 	public static final boolean EXCEPTION_NOT_EXPECTED = false;
 
 	// By default: TEST_GPU is set to false to allow developers without Nvidia GPU to run integration test suite
-	public static final boolean TEST_GPU = false;
+	public static boolean TEST_GPU = false;
 	public static final double GPU_TOLERANCE = 1e-9;
 
 	public static final int FED_WORKER_WAIT = 1000; // in ms
@@ -170,6 +170,8 @@ public String getCodgenConfig() {
 
 	protected static final boolean DEBUG = false;
 
+	public static boolean VERBOSE_STATS = false;
+
 	protected String fullDMLScriptName; // utilize for both DML and PyDML, should probably be renamed.
 	// protected String fullPYDMLScriptName;
 	protected String fullRScriptName;
@@ -209,6 +211,8 @@ public String getCodgenConfig() {
 			e.printStackTrace();
 		}
 		outputBuffering = Boolean.parseBoolean(properties.getProperty("automatedtestbase.outputbuffering"));
+		TEST_GPU = Boolean.parseBoolean(properties.getProperty("enableGPU"));
+		VERBOSE_STATS = Boolean.parseBoolean(properties.getProperty("enableStats"));
 	}
 
 	// Timestamp before test start.
@@ -1292,6 +1296,8 @@ else if(rtplatform == ExecMode.SPARK)
 
 		if(TEST_GPU)
 			args.add("-gpu");
+		if(VERBOSE_STATS)
+			args.add("-stats");
 	}
 
 	public static int getRandomAvailablePort() {

src/test/java/org/apache/sysds/test/functions/unary/scalar/ExponentTest.java

@@ -205,7 +205,7 @@ public void testTwoParameters() {
 
 		createHelperMatrix();
 
-		runTest(true, LanguageException.class);
+		runTest(EXCEPTION_EXPECTED, LanguageException.class);
 	}
 
 }