Renaming Path to Bip32Path, invalid to fixtures

Only thing I haven't been able to do is to add "undefined" to fixtures. So I could not properly test
that node.derivePath() properly fails as it should. However, I added "null" there, and "null" and "undefined"
behave in similar way in JavaScript, so that should catch that.

src/hdnode.js

@@ -292,7 +292,7 @@ HDNode.prototype.isNeutered = function () {
 }
 
 HDNode.prototype.derivePath = function (path) {
-  typeforce(types.Path, path)
+  typeforce(types.Bip32Path, path)
 
   var splitPath = path.split('/')
   if (splitPath[0] === 'm') {

src/types.js

@@ -26,7 +26,7 @@ function UInt53 (value) {
     Math.floor(value) === value
 }
 
-function Path (value) {
+function Bip32Path (value) {
   return typeforce.String(value) &&
     value.match(/^([m]\/)?([0-9]+[']?\/)*([0-9]+[']?)$/)
 }
@@ -63,7 +63,7 @@ var types = {
   UInt31: UInt31,
   UInt32: UInt32,
   UInt53: UInt53,
-  Path: Path
+  Bip32Path: Bip32Path
 }
 
 for (var typeName in typeforce) {

test/fixtures/hdnode.json

@@ -232,6 +232,27 @@
         "exception": "Point is not on the curve",
         "hex": "0488b21e000000000000000000873dff81c02f525623fd1fe5167eac3a55a049de3d314bb42ee227ffed37d508020045400697100007000037899988826500030092003000016366806305909050"
       }
+    ],
+    "deriveHardened": [
+      2147483648,
+      null,
+      "foo",
+      -1
+    ],
+    "derive": [
+      4294967296,
+      null,
+      "foo",
+      -1
+    ],
+    "derivePath": [
+      2,
+      [2, 3, 4],
+      "/",
+      "m/m/123",
+      "a/0/1/2",
+      "m/0/  1  /2",
+      "m/0/1.5/2"
     ]
   }
 }

test/hdnode.js

@@ -365,70 +365,27 @@ describe('HDNode', function () {
       }, /Could not derive hardened child key/)
     })
 
-    it('throws on negative indexes', function () {
-      var f = fixtures.valid[0]
-      var master = HDNode.fromBase58(f.master.base58, NETWORKS_LIST)
-
-      assert.throws(function () {
-        master.deriveHardened(-1)
-      }, /Expected UInt31/)
-      assert.throws(function () {
-        master.derive(-1)
-      }, /Expected UInt32/)
-    })
-
-    it('throws on high indexes', function () {
+    it('throws on wrong types', function () {
       var f = fixtures.valid[0]
       var master = HDNode.fromBase58(f.master.base58, NETWORKS_LIST)
 
-      assert.throws(function () {
-        master.deriveHardened(0x80000000)
-      }, /Expected UInt31/)
-      assert.throws(function () {
-        master.derive(0x100000000)
-      }, /Expected UInt32/)
-    })
+      fixtures.invalid.derive.forEach(function (fx) {
+        assert.throws(function () {
+          master.derive(fx)
+        }, /Expected UInt32/)
+      })
 
-    it('throws on wrong types', function () {
-      var f = fixtures.valid[0]
-      var master = HDNode.fromBase58(f.master.base58, NETWORKS_LIST)
+      fixtures.invalid.deriveHardened.forEach(function (fx) {
+        assert.throws(function () {
+          master.deriveHardened(fx)
+        }, /Expected UInt31/)
+      })
 
-      assert.throws(function () {
-        master.deriveHardened()
-      }, /Expected UInt31/)
-      assert.throws(function () {
-        master.derive()
-      }, /Expected UInt32/)
-      assert.throws(function () {
-        master.deriveHardened('foo')
-      }, /Expected UInt31/)
-      assert.throws(function () {
-        master.derive('foo')
-      }, /Expected UInt32/)
-      assert.throws(function () {
-        master.derivePath()
-      }, /Expected Path/)
-      assert.throws(function () {
-        master.derivePath(2)
-      }, /Expected Path/)
-      assert.throws(function () {
-        master.derivePath([2, 3, 4])
-      }, /Expected Path/)
-      assert.throws(function () {
-        master.derivePath('/')
-      }, /Expected Path/)
-      assert.throws(function () {
-        master.derivePath('m/m/123')
-      }, /Expected Path/)
-      assert.throws(function () {
-        master.derivePath('a/0/1/2')
-      }, /Expected Path/)
-      assert.throws(function () {
-        master.derivePath('m/0/  1  /2')
-      }, /Expected Path/)
-      assert.throws(function () {
-        master.derivePath('m/0/1.5/2')
-      }, /Expected Path/)
+      fixtures.invalid.derivePath.forEach(function (fx) {
+        assert.throws(function () {
+          master.derivePath(fx)
+        }, /Expected Bip32Path/)
+      })
     })
   })
 })