Extract common setup

WordProblemSolver no longer instantiates in each test

exercises/wordy/src/test/java/WordProblemSolverTest.java

 import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
+import org.junit.Before;
 import org.junit.rules.ExpectedException;
 
 import static org.junit.Assert.assertEquals;
     @Rule
     public ExpectedException expectedException = ExpectedException.none();
 
+    WordProblemSolver solver;
+
+    @Before
+    public void setup() {
+        solver = new WordProblemSolver();
+    }
+
     @Test
     public void testSingleAddition1() {
-        assertEquals(2, new WordProblemSolver().solve("What is 1 plus 1?"));
+        assertEquals(2, solver.solve("What is 1 plus 1?"));
     }
 
     @Ignore
     @Test
     public void testSingleAddition2() {
-        assertEquals(55, new WordProblemSolver().solve("What is 53 plus 2?"));
+        assertEquals(55, solver.solve("What is 53 plus 2?"));
     }
 
     @Ignore
     @Test
     public void testSingleAdditionWithNegativeNumbers() {
-        assertEquals(-11, new WordProblemSolver().solve("What is -1 plus -10?"));
+        assertEquals(-11, solver.solve("What is -1 plus -10?"));
     }
 
     @Ignore
     @Test
     public void testSingleAdditionOfLargeNumbers() {
-        assertEquals(45801, new WordProblemSolver().solve("What is 123 plus 45678?"));
+        assertEquals(45801, solver.solve("What is 123 plus 45678?"));
     }
 
     @Ignore
     @Test
     public void testSingleSubtraction() {
-        assertEquals(16, new WordProblemSolver().solve("What is 4 minus -12?"));
+        assertEquals(16, solver.solve("What is 4 minus -12?"));
     }
 
     @Ignore
     @Test
     public void testSingleMultiplication() {
-        assertEquals(-75, new WordProblemSolver().solve("What is -3 multiplied by 25?"));
+        assertEquals(-75, solver.solve("What is -3 multiplied by 25?"));
     }
 
     @Ignore
     @Test
     public void testSingleDivision() {
-        assertEquals(-11, new WordProblemSolver().solve("What is 33 divided by -3?"));
+        assertEquals(-11, solver.solve("What is 33 divided by -3?"));
     }
 
     @Ignore
     @Test
     public void testMultipleAdditions() {
-        assertEquals(3, new WordProblemSolver().solve("What is 1 plus 1 plus 1?"));
+        assertEquals(3, solver.solve("What is 1 plus 1 plus 1?"));
     }
 
     @Ignore
     @Test
     public void testAdditionThenSubtraction() {
-        assertEquals(8, new WordProblemSolver().solve("What is 1 plus 5 minus -2?"));
+        assertEquals(8, solver.solve("What is 1 plus 5 minus -2?"));
     }
 
     @Ignore
     @Test
     public void testMultipleSubtractions() {
-        assertEquals(3, new WordProblemSolver().solve("What is 20 minus 4 minus 13?"));
+        assertEquals(3, solver.solve("What is 20 minus 4 minus 13?"));
     }
 
     @Ignore
     @Test
     public void testSubtractionThenAddition() {
-        assertEquals(14, new WordProblemSolver().solve("What is 17 minus 6 plus 3?"));
+        assertEquals(14, solver.solve("What is 17 minus 6 plus 3?"));
     }
 
     @Ignore
     @Test
     public void testMultipleMultiplications() {
-        assertEquals(-12, new WordProblemSolver().solve("What is 2 multiplied by -2 multiplied by 3?"));
+        assertEquals(-12, solver.solve("What is 2 multiplied by -2 multiplied by 3?"));
     }
 
     @Ignore
     @Test
     public void testAdditionThenMultiplication() {
-        assertEquals(-8, new WordProblemSolver().solve("What is -3 plus 7 multiplied by -2?"));
+        assertEquals(-8, solver.solve("What is -3 plus 7 multiplied by -2?"));
     }
 
     @Ignore
     @Test
     public void testMultipleDivisions() {
-        assertEquals(2, new WordProblemSolver().solve("What is -12 divided by 2 divided by -3?"));
+        assertEquals(2, solver.solve("What is -12 divided by 2 divided by -3?"));
     }
 
     @Ignore
         expectedException.expect(IllegalArgumentException.class);
         expectedException.expectMessage("I'm sorry, I don't understand the question!");
 
-        new WordProblemSolver().solve("What is 52 cubed?");
+        solver.solve("What is 52 cubed?");
     }
 
     @Ignore
         expectedException.expectMessage("I'm sorry, I don't understand the question!");
 
         // See https://en.wikipedia.org/wiki/President_of_the_United_States if you really need to know!
-        new WordProblemSolver().solve("Who is the President of the United States?");
+        solver.solve("Who is the President of the United States?");
     }
 
 }