Updatig test file

Author: jagdish-15

exercises/practice/forth/forth.spec.js

@@ -37,6 +37,11 @@ describe('Forth', () => {
         forth.evaluate('1 +');
       }).toThrow(new Error('Stack empty'));
     });
+
+    xtest('more than two values on the stack', () => {
+      forth.evaluate('1 2 3 +');
+      expect(forth.stack).toEqual([1, 5]);
+    });
   });
 
   describe('subtraction', () => {
@@ -56,6 +61,11 @@ describe('Forth', () => {
         forth.evaluate('1 -');
       }).toThrow(new Error('Stack empty'));
     });
+
+    xtest('more than two values on the stack', () => {
+      forth.evaluate('1 12 3 -');
+      expect(forth.stack).toEqual([1, 9]);
+    });
   });
 
   describe('multiplication', () => {
@@ -75,6 +85,11 @@ describe('Forth', () => {
         forth.evaluate('1 *');
       }).toThrow(new Error('Stack empty'));
     });
+
+    xtest('more than two values on the stack', () => {
+      forth.evaluate('1 2 3 *');
+      expect(forth.stack).toEqual([1, 6]);
+    });
   });
 
   describe('division', () => {
@@ -105,6 +120,11 @@ describe('Forth', () => {
         forth.evaluate('1 /');
       }).toThrow(new Error('Stack empty'));
     });
+
+    xtest('more than two values on the stack', () => {
+      forth.evaluate('1 12 3 /');
+      expect(forth.stack).toEqual([1, 4]);
+    });
   });
 
   describe('combined arithmetic', () => {
@@ -117,6 +137,16 @@ describe('Forth', () => {
       forth.evaluate('2 4 * 3 /');
       expect(forth.stack).toEqual([2]);
     });
+
+    xtest('multiplication and addition', () => {
+      forth.evaluate('1 3 4 * +');
+      expect(forth.stack).toEqual([13]);
+    });
+
+    xtest('addition and multiplication', () => {
+      forth.evaluate('1 3 4 + *');
+      expect(forth.stack).toEqual([7]);
+    });
   });
 
   describe('dup', () => {
@@ -250,11 +280,12 @@ describe('Forth', () => {
       expect(forth.stack).toEqual([11]);
     });
 
-    xtest('cannot redefine numbers', () => {
+    xtest('cannot redefine non-negative numbers', () => {
       expect(() => {
         forth.evaluate(': 1 2 ;');
       }).toThrow(new Error('Invalid definition'));
     });
+
     xtest('cannot redefine negative numbers', () => {
       expect(() => {
         forth.evaluate(': -1 2 ;');