Support Buffers in Expect Matchers and Pretty Format

src/expect/src/matchers.lua

@@ -756,8 +756,14 @@ local function toEqual(
 		end
 	else
 		message = function()
-			return matcherHint(matcherName, nil, nil, options)
-				.. "\n\n"
+			local retval = matcherHint(matcherName, nil, nil, options) .. "\n\n"
+			if type(received) == "buffer" or type(expected) == "buffer" then
+				retval = retval
+					.. DIM_COLOR("If comparing buffers, consider reading their data and comparing that instead")
+					.. "\n\n"
+			end
+
+			return retval
 				.. printDiffOrStringify(expected, received, EXPECTED_LABEL, RECEIVED_LABEL, isExpand(self.expand))
 		end
 	end

src/jest-get-type/src/__tests__/getType.spec.lua

@@ -59,6 +59,10 @@ describe(".getType()", function()
 		expect(getType(true)).toBe("boolean")
 	end)
 
+	it("buffer", function()
+		expect(getType(buffer.fromstring("test"))).toBe("buffer")
+	end)
+
 	-- ROBLOX deviation start: additional symbol tests
 	it("symbol", function()
 		expect(getType(Symbol("test"))).toBe("symbol")

src/jest-get-type/src/init.lua

@@ -32,6 +32,9 @@ local function getType(value: any): string
 	if typeof(value) == "boolean" then
 		return "boolean"
 	end
+	if typeof(value) == "buffer" then
+		return "buffer"
+	end
 	if typeof(value) == "function" then
 		return "function"
 	end

src/jest-roblox-shared/src/expect.lua

@@ -139,6 +139,8 @@ local function eq(
 		return a == b
 	elseif className == "regexp" then
 		return tostring(a) == tostring(b)
+	elseif className == "buffer" then
+		return buffer.tostring(a) == buffer.tostring(b)
 	end
 
 	if typeof(a) ~= "table" or typeof(b) ~= "table" then

src/pretty-format/src/init.lua

@@ -144,6 +144,11 @@ local function printBasicValue(
 		return val
 	end
 
+	if typeOf == "buffer" then
+		local bytes = { string.byte(buffer.tostring(val), 1, -1) }
+		return string.format("buffer { size = %*, data = %q }", buffer.len(val), table.concat(bytes, "/"))
+	end
+
 	-- ROBLOX deviation: output classname for Instance types
 	if typeOf == "Instance" then
 		return val.ClassName