patch 9.0.1150: :interface is not implemented yet
Problem: :interface is not implemented yet.
Solution: Implement the basics of :interface.
diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
index b98b96f..8c37a60 100644
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -552,5 +552,65 @@
v9.CheckScriptSuccess(lines)
enddef
+def Test_interface_basics()
+ var lines =<< trim END
+ vim9script
+ interface Something
+ this.value: string
+ static count: number
+ def GetCount(): number
+ endinterface
+ END
+ v9.CheckScriptSuccess(lines)
+
+ lines =<< trim END
+ interface SomethingWrong
+ static count = 7
+ endinterface
+ END
+ v9.CheckScriptFailure(lines, 'E1342:')
+
+ lines =<< trim END
+ vim9script
+
+ interface Some
+ static count: number
+ def Method(count: number)
+ endinterface
+ END
+ # TODO: this should give an error for "count" shadowing
+ v9.CheckScriptSuccess(lines)
+
+ lines =<< trim END
+ vim9script
+ interface somethingWrong
+ static count = 7
+ endinterface
+ END
+ v9.CheckScriptFailure(lines, 'E1343: Interface name must start with an uppercase letter: somethingWrong')
+
+ lines =<< trim END
+ vim9script
+ interface SomethingWrong
+ this.value: string
+ static count = 7
+ def GetCount(): number
+ endinterface
+ END
+ v9.CheckScriptFailure(lines, 'E1344:')
+
+ lines =<< trim END
+ vim9script
+ interface SomethingWrong
+ this.value: string
+ static count: number
+ def GetCount(): number
+ return 5
+ enddef
+ endinterface
+ END
+ v9.CheckScriptFailure(lines, 'E1345: Not a valid command in an interface: return 5')
+enddef
+
" vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker