Add test cases for ignore_unmatched behavior

test/interactive.vader

@@ -1235,3 +1235,49 @@ Execute (unset g:easy_align_interactive_modes):
   unlet g:easy_align_interactive_modes
   unlet g:easy_align_bang_interactive_modes
 
+Given (Test ignore_unmatched behavior):
+  a = b = c
+  aabba = bbbbb
+
+Do (left-align):
+  vip\<Enter>*=
+
+Expect:
+  a     = b = c
+  aabba = bbbbb
+
+Do (left-align, no ignore_unmatched):
+  vip\<Enter>\<C-U>*=
+
+Expect:
+  a     = b     = c
+  aabba = bbbbb
+
+Do (right-align):
+  vip\<Enter>\<Enter>*=
+
+Expect:
+      a =     b = c
+  aabba = bbbbb
+
+Do (right-align, explicit ignore_unmatched):
+  vip\<Enter>\<Enter>\<C-U>\<C-U>*=
+
+Expect:
+      a = b = c
+  aabba = bbbbb
+
+Do (center-align):
+  vip\<Enter>\<Enter>\<Enter>*=
+
+Expect:
+    a   =   b   = c
+  aabba = bbbbb
+
+Do (center-align):
+  vip\<C-U>\<Enter>\<Enter>\<Enter>\<C-U>*=
+
+Expect:
+    a   = b = c
+  aabba = bbbbb
+