fix: parse value of Int32 in constructor

Parses the value passed into the Int32 constructor using + prefixed variable. The value should always be a number. Fixes issues whereby EJSON parse would return string value with relaxed option. Verified no breaking changes to hex strings.

NODE-2613

lib/int_32.js

@@ -6,15 +6,15 @@ class Int32 {
   /**
    * Create an Int32 type
    *
-   * @param {number|Number} value the number we want to represent as an int32.
+   * @param {*} value the number we want to represent as an int32.
    * @return {Int32}
    */
   constructor(value) {
     if (value instanceof Number) {
       value = value.valueOf();
     }
 
-    this.value = value;
+    this.value = +value;
   }
 
   /**

test/node/extended_json_tests.js

@@ -280,7 +280,7 @@ describe('Extended JSON', function() {
     expect(result.double.value).to.equal(10.1);
     // int32
     expect(result.int32).to.be.an.instanceOf(BSON.Int32);
-    expect(result.int32.value).to.equal('10');
+    expect(result.int32.value).to.equal(10);
     //long
     expect(result.long).to.be.an.instanceOf(BSON.Long);
     // maxKey
@@ -642,6 +642,24 @@ describe('Extended JSON', function() {
           const bson = EJSON.parse('{"field":1}', { legacy: true });
           expect(bson).to.deep.equal(doc);
         });
+
+        it('parses the numberInt without doc', function() {
+          const value = 1;
+          const bson = EJSON.parse('{ "$numberInt": "1" }');
+          expect(bson).to.deep.equal(value);
+        });
+
+        it('parses the numberInt', function() {
+          const doc = { field: 1 };
+          const bson = EJSON.parse('{"field": {"$numberInt": "1"}}');
+          expect(bson).to.deep.equal(doc);
+        });
+
+        it('parses the numberInt and stringify', function() {
+          const doc = { field: 1 };
+          const bson = EJSON.parse('{"field": {"$numberInt": "1"}}');
+          expect(EJSON.stringify(bson)).to.deep.equal(JSON.stringify(doc));
+        });
       });
 
       context('when deserializing double', function() {

test/node/int_32_tests.js

@@ -5,8 +5,11 @@ const Int32 = BSON.Int32;
 const expect = require('chai').expect;
 
 describe('Int32', function() {
-  describe('Constructor', function() {
-    var value = 42;
+  context('Constructor', function() {
+    const strHexValue = '0x2a';
+    const hexValue = 0x2a;
+    const octalValue = 0o52;
+    const value = 42;
 
     it('Primitive number', function(done) {
       expect(new Int32(value).valueOf()).to.equal(value);
@@ -17,5 +20,40 @@ describe('Int32', function() {
       expect(new Int32(new Number(value)).valueOf()).to.equal(value);
       done();
     });
+
+    it('String Hex', function(done) {
+      expect(new Int32(strHexValue).valueOf()).to.equal(value);
+      done();
+    });
+
+    it('Hex', function(done) {
+      expect(new Int32(hexValue).valueOf()).to.equal(value);
+      done();
+    });
+
+    it('Octal', function(done) {
+      expect(new Int32(octalValue).valueOf()).to.equal(value);
+      done();
+    });
+
+    it('should equal zero', function() {
+      const prop = 'key';
+      const zero = BSON.serialize({ [prop]: new Int32(0) }).toString();
+      // should equal zero
+      ['fortyTwo', '42fortyTwo', '0', 0, Infinity, 'Infinity'].forEach(value => {
+        expect(BSON.serialize({ [prop]: new Int32(value) }).toString()).to.equal(zero);
+        expect(BSON.serialize({ [prop]: new Int32(+value) }).toString()).to.equal(zero);
+      });
+    });
+
+    it('should equal fortyTwo', function() {
+      const prop = 'key';
+      const fortyTwo = BSON.serialize({ [prop]: new Int32(value) }).toString();
+      // should equal fortyTwo
+      [strHexValue, hexValue, octalValue].forEach(value => {
+        expect(BSON.serialize({ [prop]: new Int32(value) }).toString()).to.equal(fortyTwo);
+        expect(BSON.serialize({ [prop]: new Int32(+value) }).toString()).to.equal(fortyTwo);
+      });
+    });
   });
 });