1 files changed, 99 insertions, 0 deletions
diff --git a/test/bucket/delta.ts b/test/bucket/delta.ts
new file mode 100644
index 0000000..ba1d192
--- /dev/null
+++ b/test/bucket/delta.ts
@@ -0,0 +1,99 @@
+/**
+ * Test the delta generated from two key/value stores
+ *
+ *  Copyright (C) 2010-2019 R-T Specialty, LLC.
+ *
+ *  This file is part of liza.
+ *
+ *  liza is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+import { createDelta as sut, Kv , DeltaResult} from "../../src/bucket/delta";
+
+import { expect, use as chai_use } from 'chai';
+chai_use( require( 'chai-as-promised' ) );
+
+interface SutTestCase<T>
+{
+    label:     string;
+    src_data:  T;
+    dest_data: T;
+    expected:  DeltaResult<T>;
+}
+
+describe( 'Delta', () =>
+{
+    ( <SutTestCase<Kv<string>>[]>[
+        {
+            label:     "No changes are made, key is dropped",
+            src_data:  { foo: [ 'bar', 'baz' ] },
+            dest_data: { foo: [ 'bar', 'baz' ] },
+            expected:  {},
+        },
+        {
+            label:     "Only the unchanged key is dropped",
+            src_data:  { foo: [ 'bar', 'baz' ], bar: [ 'qwe' ] },
+            dest_data: { foo: [ 'bar', 'baz' ], bar: [ 'asd' ] },
+            expected:  { bar: [ 'asd' ] },
+        },
+        {
+            label:     "Changed values are updated by index with old value",
+            src_data:  { foo: [ "bar", "baz", "quux" ] },
+            dest_data: { foo: [ "bar", "quuux" ], moo: [ "cow" ]  },
+            expected:  { foo: [ undefined, "quuux", null ], moo: [ "cow" ] },
+        },
+        {
+            label:     "The keys are null when they don't exist in first set",
+            src_data:  {},
+            dest_data: { foo: [ "bar", "quuux" ], moo: [ "cow" ] },
+            expected:  { foo: [ "bar", "quuux" ], moo: [ "cow" ] },
+        },
+        {
+            label:     "Removed keys in new set show up",
+            src_data:  { foo: [ "bar" ] },
+            dest_data: {},
+            expected:  { foo: null },
+        },
+        {
+            label:     "Indexes after a null terminator aren't included",
+            src_data:  { foo: [ "one", "two", "three", "four" ] },
+            dest_data: { foo: [ "one", "done" ] },
+            expected:  { foo: [ undefined, "done", null ] },
+        },
+        {
+            label:     "Consider nested arrays to be scalar values",
+            src_data:  { foo: [ [ "one" ], [ "two", "three" ] ] },
+            dest_data: { foo: [ [ "one" ], [ "two" ] ] },
+            expected:  { foo: [ undefined, [ "two" ] ] },
+        },
+        {
+            label:     "Don't evaluate zeros as falsy",
+            src_data:  { foo: [ 0 ] },
+            dest_data: { foo: [ 0 ] },
+            expected:  {},
+        },
+        {
+            label:     "Don't evaluate empty strings as falsy",
+            src_data:  { foo: [ '' ] },
+            dest_data: { foo: [ '' ] },
+            expected:  {},
+        },
+    ] ).forEach( ( { label, src_data, dest_data, expected } ) =>
+    {
+        it( label, () =>
+        {
+            expect( sut( src_data, dest_data ) ).to.deep.equal( expected );
+        } );
+    } );
+} );