Issue 415: Add some tests for arithmetic expressions in GREL

git-svn-id: http://google-refine.googlecode.com/svn/trunk@2122 7d457c2a-affb-35e4-300a-418c747d4874

main/tests/server/src/com/google/refine/tests/grel/GrelTests.java

@@ -0,0 +1,177 @@
+/*
+
+Copyright 2011. Thomas F. Morris
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+    * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+package com.google.refine.tests.grel;
+
+import java.util.Properties;
+
+import org.slf4j.LoggerFactory;
+import org.testng.Assert;
+import org.testng.annotations.AfterMethod;
+import org.testng.annotations.BeforeMethod;
+import org.testng.annotations.BeforeTest;
+import org.testng.annotations.Test;
+
+import com.google.refine.expr.EvalError;
+import com.google.refine.expr.Evaluable;
+import com.google.refine.expr.ExpressionUtils;
+import com.google.refine.expr.MetaParser;
+import com.google.refine.expr.ParsingException;
+import com.google.refine.model.Project;
+import com.google.refine.tests.RefineTest;
+
+public class GrelTests extends RefineTest {
+
+    Project project;
+    Properties bindings;
+    
+    @Override
+    @BeforeTest
+    public void init() {
+        logger = LoggerFactory.getLogger(this.getClass());
+    }
+
+
+    @BeforeMethod
+    public void SetUp() {
+        project = new Project();
+        bindings = ExpressionUtils.createBindings(project);
+    }
+
+    @AfterMethod
+    public void TearDown() {
+        project = null;
+        bindings = null;
+    }
+
+    // -----------------tests------------
+
+    @Test
+    public void testInvalidSyntax() {
+        String tests[] = {
+                "",
+                "1-1-",
+                "2**3",
+//                "2^3" // TODO: Should this generate an error?
+                };
+        for (String test : tests) {
+            try{
+                MetaParser.parse("grel:"+test);
+            } catch (ParsingException e) {
+                // Test succeeded
+                continue;
+            }
+            Assert.fail("Expression failed to generate parse syntax error: " + test);
+        }
+    }
+
+    @Test
+    public void testEvalError() {
+        String tests[] = {
+//                "1=1", // TODO: Throws NullPointerException
+                "a.value",
+                };
+        for (String test : tests) {
+            try {
+                Evaluable eval = MetaParser.parse("grel:" + test);
+                Object result = eval.evaluate(bindings);
+                Assert.assertTrue(result instanceof EvalError );
+            } catch (ParsingException e) {
+                Assert.fail("Unexpected parse failure: " + test);                
+            }
+        }
+    }
+    
+    @Test
+    public void testMath() throws ParsingException {
+        String tests[][] = { 
+                { "1", "1" }, 
+                { "1 + 1", "2" }, 
+                { "1 + 1 + 1", "3" }, 
+                { "1-1-1", "-1" }, 
+                { "1-2-3", "-4" }, 
+                { "1-(2-3)", "2" }, 
+                { "2*3", "6" }, 
+                { "3%2", "1" }, 
+                { "3/2", "1" },
+                { "3.0/2", "1.5" }, 
+                { "1==1", "true" }, 
+                { "1==2", "false" }, 
+                { "1>2", "false" }, 
+                { "1<2", "true" }, 
+                { "1>1", "false" }, 
+                { "1>=1", "true" }, 
+                { "1<=2", "true" }, 
+                { "2<=2", "true" }, 
+                { "3<=2", "false" }, 
+//                { "", "" }, 
+        };
+        for (String[] test : tests) {
+            parseEval(bindings, test);
+        }
+    }
+
+    @Test
+    public void testPI() throws ParsingException {
+        String test[] = { "PI", "3.141592653589793" };
+        parseEval(bindings, test);
+    }
+
+    @Test
+    public void testString() throws ParsingException {
+        String tests[][] = { 
+                { "1", "1" }, 
+                { "1 + 1", "2" }, 
+                { "1 + 1 + 1", "3" }, 
+                { "1-1-1", "-1" }, 
+                { "1-2-3", "-4" }, 
+                { "1-(2-3)", "2" }, 
+                { "2*3", "6" }, 
+                { "3%2", "1" }, 
+                { "3/2", "1" },
+                { "3.0/2", "1.5" }, 
+                { "1", "1" }, 
+        };
+        for (String[] test : tests) {
+            parseEval(bindings, test);
+        }
+    }
+    private void parseEval(Properties bindings, String[] test)
+            throws ParsingException {
+        Evaluable eval = MetaParser.parse("grel:" + test[0]);
+        Object result = eval.evaluate(bindings);
+        Assert.assertEquals(result.toString(), test[1], 
+                "Wrong result for expression: "+test[0]);
+    }
+
+}