add tests for semantic tokens

tests/lsp_features/semantic_tokens.zig

@@ -0,0 +1,55 @@
+const std = @import("std");
+const zls = @import("zls");
+
+const Context = @import("context").Context;
+
+const requests = zls.requests;
+
+const allocator: std.mem.Allocator = std.testing.allocator;
+
+test "semantic tokens - empty" {
+    try testSemanticTokens("", &.{});
+}
+
+test "semantic tokens" {
+    try testSemanticTokens(
+        \\const std = @import("std");
+    ,
+        &.{ 0, 0, 5, 7, 0, 0, 6, 3, 0, 33, 0, 4, 1, 11, 0, 0, 2, 7, 12, 0, 0, 8, 5, 9, 0 },
+    );
+    // TODO more tests
+}
+
+fn testSemanticTokens(source: []const u8, expected: []const u32) !void {
+    var ctx = try Context.init();
+    defer ctx.deinit();
+
+    ctx.server.config.enable_semantic_tokens = true;
+
+    const open_document = requests.OpenDocument{
+        .params = .{
+            .textDocument = .{
+                .uri = "file:///test.zig",
+                // .languageId = "zig",
+                // .version = 420,
+                .text = source,
+            },
+        },
+    };
+
+    const did_open_method = try std.json.stringifyAlloc(allocator, open_document.params, .{});
+    defer allocator.free(did_open_method);
+
+    try ctx.request("textDocument/didOpen", did_open_method, null);
+
+    const Response = struct {
+        data: []const u32,
+    };
+
+    const expected_bytes = try std.json.stringifyAlloc(allocator, Response{ .data = expected }, .{});
+    defer allocator.free(expected_bytes);
+
+    try ctx.request("textDocument/semanticTokens/full",
+        \\{"textDocument":{"uri":"file:///test.zig"}}
+    , expected_bytes);
+}

tests/sessions.zig

@@ -3,21 +3,6 @@ const Context = @import("context.zig").Context;
 
 const allocator = std.testing.allocator;
 
-test "Open file, ask for semantic tokens" {
-    var ctx = try Context.init();
-    defer ctx.deinit();
-
-    try ctx.request("textDocument/didOpen",
-        \\{"textDocument":{"uri":"file:///test.zig","languageId":"zig","version":420,"text":"const std = @import(\"std\");"}}
-    , null);
-
-    try ctx.request("textDocument/semanticTokens/full",
-        \\{"textDocument":{"uri":"file:///test.zig"}}
-    ,
-        \\{"data":[0,0,5,7,0,0,6,3,0,33,0,4,1,11,0,0,2,7,12,0,0,8,5,9,0]}
-    );
-}
-
 test "Request completion in an empty file" {
     var ctx = try Context.init();
     defer ctx.deinit();

tests/tests.zig

@@ -5,7 +5,8 @@ test {
 
     // TODO Document Synchronization
 
-    // TODO LSP features
+    // LSP features
+    _ = @import("lsp_features/semantic_tokens.zig");
 
     // TODO Language features
 }