1 files changed, 75 insertions, 0 deletions
diff --git a/school/node_modules/cuint/test/UINT32_subtract-test.js b/school/node_modules/cuint/test/UINT32_subtract-test.js
new file mode 100644
index 0000000..9fa5488
--- /dev/null
+++ b/school/node_modules/cuint/test/UINT32_subtract-test.js
@@ -0,0 +1,75 @@
+var assert = require('assert')
+var UINT32 = require('..').UINT32
+
+describe('subtract method', function () {
+
+  describe('0-0', function () {
+
+    it('should return 0', function (done) {
+      var u = UINT32(0).subtract( UINT32(0) )
+
+      assert.equal( u.toNumber(), 0 )
+      done()
+    })
+
+  })
+
+  describe('1-0', function () {
+
+    it('should return 1', function (done) {
+      var u = UINT32(1).subtract( UINT32(0) )
+
+      assert.equal( u.toNumber(), 1 )
+      done()
+    })
+
+  })
+
+  describe('0-1', function () {
+
+    it('should return -1', function (done) {
+      var u = UINT32(0).subtract( UINT32(1) )
+
+      assert.equal( u.toNumber(), -1 )
+      done()
+    })
+
+  })
+
+  describe('low bit-high bit', function () {
+
+    it('should return 0', function (done) {
+      var n = Math.pow(2, 17)
+      var u = UINT32(1).subtract( UINT32(n) )
+
+      assert.equal( u.toNumber(), 1-n )
+      done()
+    })
+
+  })
+
+  describe('high bit-low bit', function () {
+
+    it('should return n', function (done) {
+      var n = Math.pow(2, 17)
+      var u = UINT32(n).subtract( UINT32(123) )
+
+      assert.equal( u.toNumber(), n - 123 )
+      done()
+    })
+
+  })
+
+  describe('high bit-high bit', function () {
+
+    it('should return n', function (done) {
+      var n = Math.pow(2, 17)
+      var u = UINT32(n+1).subtract( UINT32(n) )
+
+      assert.equal( u.toNumber(), 1 )
+      done()
+    })
+
+  })
+
+})