diff --git a/src/cdp/cdp.zig b/src/cdp/cdp.zig
index 08055d86..58ed11b9 100644
--- a/src/cdp/cdp.zig
+++ b/src/cdp/cdp.zig
@@ -168,13 +168,11 @@ pub fn CDPT(comptime TypeProvider: type) type {
 
             if (is_startup) {
                 dispatchStartupCommand(&command, input.method) catch |err| {
-                    command.sendError(-31999, @errorName(err), .{}) catch {};
-                    return err;
+                    command.sendError(-31999, @errorName(err), .{}) catch return err;
                 };
             } else {
                 dispatchCommand(&command, input.method) catch |err| {
-                    command.sendError(-31998, @errorName(err), .{}) catch {};
-                    return err;
+                    command.sendError(-31998, @errorName(err), .{}) catch return err;
                 };
             }
         }
@@ -924,18 +922,20 @@ test "cdp: invalid json" {
     // method is required
     try testing.expectError(error.InvalidJSON, ctx.processMessage(.{}));
 
-    try testing.expectError(error.InvalidMethod, ctx.processMessage(.{
+    try ctx.processMessage(.{
         .method = "Target",
-    }));
+    });
     try ctx.expectSentError(-31998, "InvalidMethod", .{});
 
-    try testing.expectError(error.UnknownDomain, ctx.processMessage(.{
+    try ctx.processMessage(.{
         .method = "Unknown.domain",
-    }));
+    });
+    try ctx.expectSentError(-31998, "UnknownDomain", .{});
 
-    try testing.expectError(error.UnknownMethod, ctx.processMessage(.{
+    try ctx.processMessage(.{
         .method = "Target.over9000",
-    }));
+    });
+    try ctx.expectSentError(-31998, "UnknownMethod", .{});
 }
 
 test "cdp: invalid sessionId" {
diff --git a/src/cdp/domains/dom.zig b/src/cdp/domains/dom.zig
index 5150a8e5..386577db 100644
--- a/src/cdp/domains/dom.zig
+++ b/src/cdp/domains/dom.zig
@@ -550,11 +550,12 @@ test "cdp.dom: getSearchResults unknown search id" {
     var ctx = testing.context();
     defer ctx.deinit();
 
-    try testing.expectError(error.BrowserContextNotLoaded, ctx.processMessage(.{
+    try ctx.processMessage(.{
         .id = 8,
         .method = "DOM.getSearchResults",
         .params = .{ .searchId = "Nope", .fromIndex = 0, .toIndex = 10 },
-    }));
+    });
+    try ctx.expectSentError(-31998, "BrowserContextNotLoaded", .{ .id = 8 });
 }
 
 test "cdp.dom: search flow" {
@@ -604,11 +605,12 @@ test "cdp.dom: search flow" {
     try ctx.expectSentResult(null, .{ .id = 16 });
 
     // make sure the delete actually did something
-    try testing.expectError(error.SearchResultNotFound, ctx.processMessage(.{
+    try ctx.processMessage(.{
         .id = 17,
         .method = "DOM.getSearchResults",
         .params = .{ .searchId = "0", .fromIndex = 0, .toIndex = 1 },
-    }));
+    });
+    try ctx.expectSentError(-31998, "SearchResultNotFound", .{ .id = 17 });
 }
 
 test "cdp.dom: querySelector unknown search id" {
@@ -645,11 +647,12 @@ test "cdp.dom: querySelector Node not found" {
     });
     try ctx.expectSentResult(.{ .searchId = "0", .resultCount = 2 }, .{ .id = 3 });
 
-    try testing.expectError(error.NodeNotFoundForGivenId, ctx.processMessage(.{
+    try ctx.processMessage(.{
         .id = 4,
         .method = "DOM.querySelector",
         .params = .{ .nodeId = 1, .selector = "a" },
-    }));
+    });
+    try ctx.expectSentError(-31998, "NodeNotFoundForGivenId", .{ .id = 4 });
 
     try ctx.processMessage(.{
         .id = 5,
diff --git a/src/cdp/domains/page.zig b/src/cdp/domains/page.zig
index fabf37e5..fe21fcca 100644
--- a/src/cdp/domains/page.zig
+++ b/src/cdp/domains/page.zig
@@ -633,7 +633,7 @@ test "cdp.page: getFrameTree" {
     defer ctx.deinit();
 
     {
-        try testing.expectError(error.BrowserContextNotLoaded, ctx.processMessage(.{ .id = 10, .method = "Page.getFrameTree", .params = .{ .targetId = "X" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Page.getFrameTree", .params = .{ .targetId = "X" } });
         try ctx.expectSentError(-31998, "BrowserContextNotLoaded", .{ .id = 10 });
     }
 
diff --git a/src/cdp/domains/target.zig b/src/cdp/domains/target.zig
index 80dc1512..1ff23849 100644
--- a/src/cdp/domains/target.zig
+++ b/src/cdp/domains/target.zig
@@ -556,7 +556,7 @@ test "cdp.target: disposeBrowserContext" {
     defer ctx.deinit();
 
     {
-        try testing.expectError(error.InvalidParams, ctx.processMessage(.{ .id = 7, .method = "Target.disposeBrowserContext" }));
+        try ctx.processMessage(.{ .id = 7, .method = "Target.disposeBrowserContext" });
         try ctx.expectSentError(-31998, "InvalidParams", .{ .id = 7 });
     }
 
@@ -609,7 +609,7 @@ test "cdp.target: createTarget" {
     defer ctx.deinit();
     const bc = try ctx.loadBrowserContext(.{ .id = "BID-9" });
     {
-        try testing.expectError(error.UnknownBrowserContextId, ctx.processMessage(.{ .id = 10, .method = "Target.createTarget", .params = .{ .browserContextId = "BID-8" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.createTarget", .params = .{ .browserContextId = "BID-8" } });
         try ctx.expectSentError(-31998, "UnknownBrowserContextId", .{ .id = 10 });
     }
 
@@ -626,13 +626,13 @@ test "cdp.target: closeTarget" {
     defer ctx.deinit();
 
     {
-        try testing.expectError(error.BrowserContextNotLoaded, ctx.processMessage(.{ .id = 10, .method = "Target.closeTarget", .params = .{ .targetId = "X" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.closeTarget", .params = .{ .targetId = "X" } });
         try ctx.expectSentError(-31998, "BrowserContextNotLoaded", .{ .id = 10 });
     }
 
     const bc = try ctx.loadBrowserContext(.{ .id = "BID-9" });
     {
-        try testing.expectError(error.TargetNotLoaded, ctx.processMessage(.{ .id = 10, .method = "Target.closeTarget", .params = .{ .targetId = "TID-8" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.closeTarget", .params = .{ .targetId = "TID-8" } });
         try ctx.expectSentError(-31998, "TargetNotLoaded", .{ .id = 10 });
     }
 
@@ -640,7 +640,7 @@ test "cdp.target: closeTarget" {
     _ = try bc.session.createPage();
     bc.target_id = "TID-000000000A".*;
     {
-        try testing.expectError(error.UnknownTargetId, ctx.processMessage(.{ .id = 10, .method = "Target.closeTarget", .params = .{ .targetId = "TID-8" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.closeTarget", .params = .{ .targetId = "TID-8" } });
         try ctx.expectSentError(-31998, "UnknownTargetId", .{ .id = 10 });
     }
 
@@ -657,13 +657,13 @@ test "cdp.target: attachToTarget" {
     defer ctx.deinit();
 
     {
-        try testing.expectError(error.BrowserContextNotLoaded, ctx.processMessage(.{ .id = 10, .method = "Target.attachToTarget", .params = .{ .targetId = "X" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.attachToTarget", .params = .{ .targetId = "X" } });
         try ctx.expectSentError(-31998, "BrowserContextNotLoaded", .{ .id = 10 });
     }
 
     const bc = try ctx.loadBrowserContext(.{ .id = "BID-9" });
     {
-        try testing.expectError(error.TargetNotLoaded, ctx.processMessage(.{ .id = 10, .method = "Target.attachToTarget", .params = .{ .targetId = "TID-8" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.attachToTarget", .params = .{ .targetId = "TID-8" } });
         try ctx.expectSentError(-31998, "TargetNotLoaded", .{ .id = 10 });
     }
 
@@ -671,7 +671,7 @@ test "cdp.target: attachToTarget" {
     _ = try bc.session.createPage();
     bc.target_id = "TID-000000000B".*;
     {
-        try testing.expectError(error.UnknownTargetId, ctx.processMessage(.{ .id = 10, .method = "Target.attachToTarget", .params = .{ .targetId = "TID-8" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.attachToTarget", .params = .{ .targetId = "TID-8" } });
         try ctx.expectSentError(-31998, "UnknownTargetId", .{ .id = 10 });
     }
 
@@ -701,13 +701,13 @@ test "cdp.target: getTargetInfo" {
     }
 
     {
-        try testing.expectError(error.BrowserContextNotLoaded, ctx.processMessage(.{ .id = 10, .method = "Target.getTargetInfo", .params = .{ .targetId = "X" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.getTargetInfo", .params = .{ .targetId = "X" } });
         try ctx.expectSentError(-31998, "BrowserContextNotLoaded", .{ .id = 10 });
     }
 
     const bc = try ctx.loadBrowserContext(.{ .id = "BID-9" });
     {
-        try testing.expectError(error.TargetNotLoaded, ctx.processMessage(.{ .id = 10, .method = "Target.getTargetInfo", .params = .{ .targetId = "TID-8" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.getTargetInfo", .params = .{ .targetId = "TID-8" } });
         try ctx.expectSentError(-31998, "TargetNotLoaded", .{ .id = 10 });
     }
 
@@ -715,7 +715,7 @@ test "cdp.target: getTargetInfo" {
     _ = try bc.session.createPage();
     bc.target_id = "TID-000000000C".*;
     {
-        try testing.expectError(error.UnknownTargetId, ctx.processMessage(.{ .id = 10, .method = "Target.getTargetInfo", .params = .{ .targetId = "TID-8" } }));
+        try ctx.processMessage(.{ .id = 10, .method = "Target.getTargetInfo", .params = .{ .targetId = "TID-8" } });
         try ctx.expectSentError(-31998, "UnknownTargetId", .{ .id = 10 });
     }