feat: add unmarshalling support for a number of server capability opt…

…ions with union types

lsp_3_17/base_structures.go

@@ -861,7 +861,7 @@ type WorkDoneProgressParams struct {
 //	}
 //
 // ```
-type WorkDownProgressOptions struct {
+type WorkDoneProgressOptions struct {
 	WorkDoneProgress *bool `json:"workDoneProgress,omitempty"`
 }
 
@@ -886,3 +886,11 @@ const (
 	TraceValueMessage = TraceValue("messages")
 	TraceValueVerbose = TraceValue("verbose")
 )
+
+// TextDocumentRegistrationOptions provides general
+// text document registration options.
+type TextDocumentRegistrationOptions struct {
+	// A document selector to identify to identify the scope of the registration.
+	// If set to null the document selector provided on the client side will be used.
+	DocumentSelector *DocumentSelector `json:"documentSelector"`
+}

lsp_3_17/helpers_test.go

@@ -0,0 +1,24 @@
+package lsp
+
+import (
+	"encoding/json"
+
+	"github.com/stretchr/testify/suite"
+)
+
+type serverCapabilityFixture struct {
+	name     string
+	input    string
+	expected *ServerCapabilities
+}
+
+func testServerCapabilities(s *suite.Suite, tests []serverCapabilityFixture) {
+	for _, test := range tests {
+		s.Run(test.name, func() {
+			capabilities := &ServerCapabilities{}
+			err := json.Unmarshal([]byte(test.input), capabilities)
+			s.Require().NoError(err)
+			s.Require().Equal(test.expected, capabilities)
+		})
+	}
+}