github.com/prometheus/client_model v0.6.1: go.Untyped

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify github.com/prometheus/client_model/go.Untyped in pkg:golang/github.com/prometheus/client_model@v0.6.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/prometheus/client_model@v0.6.1
Demonstrate these symbols/APIs:
  - github.com/prometheus/client_model/go.Untyped

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:5f4f50ffb45d6b8b4d3d16e9e3af3be5f0c6fe4d0913bb05a60dfa450d0e35ef","contract":["dto.Untyped.GetValue returns 0 for a nil or uninitialized Untyped, and returns the configured float64 value when set.","dto.Untyped.Reset resets the untyped metric value back to 0.","dto.Untyped.ProtoReflect returns a valid protoreflect.Message descriptor containing the value field.","dto.Untyped embeds into Metric with GetUntyped and associates with MetricType_UNTYPED in MetricFamily."],"goal":"verify github.com/prometheus/client_model/go.Untyped in pkg:golang/github.com/prometheus/client_model@v0.6.1","kind":"HOW","packages":["pkg:golang/github.com/prometheus/client_model@v0.6.1"],"schemaVersion":1,"symbols":["github.com/prometheus/client_model/go.Untyped"]},"contractCommand":["go","test","./..."],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","executionContext":"go","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","runtime":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/prometheus/client_model@v0.6.1"],"schemaVersion":1,"subject":"pkg:golang/github.com/prometheus/client_model@v0.6.1","symbols":["github.com/prometheus/client_model/go.Untyped"],"verifierAdapter":"golang@1"}

module example.com/untyped

go 1.26.6

require (
	github.com/prometheus/client_model v0.6.1
	google.golang.org/protobuf v1.33.0
)

github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=

package main

import (
	"fmt"

	dto "github.com/prometheus/client_model/go"
	"google.golang.org/protobuf/proto"
)

func main() {
	untyped := &dto.Untyped{
		Value: proto.Float64(42.0),
	}
	fmt.Printf("Untyped value: %f\n", untyped.GetValue())
	untyped.Reset()
	fmt.Printf("After reset: %f\n", untyped.GetValue())
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/prometheus/client_model/go.Untyped in pkg:golang/github.com/prometheus/client_model@v0.6.1",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/prometheus/client_model@v0.6.1"
  ],
  "symbols": [
    "github.com/prometheus/client_model/go.Untyped"
  ]
}

package test

import (
	"testing"

	dto "github.com/prometheus/client_model/go"
	"google.golang.org/protobuf/proto"
)

func TestUntypedGetValue(t *testing.T) {
	// Nil untyped returns 0
	var nilUntyped *dto.Untyped
	if got := nilUntyped.GetValue(); got != 0 {
		t.Errorf("nilUntyped.GetValue() = %v, want 0", got)
	}

	// Empty untyped returns 0
	emptyUntyped := &dto.Untyped{}
	if got := emptyUntyped.GetValue(); got != 0 {
		t.Errorf("emptyUntyped.GetValue() = %v, want 0", got)
	}

	// Untyped with configured value
	val := 123.456
	untyped := &dto.Untyped{
		Value: proto.Float64(val),
	}
	if got := untyped.GetValue(); got != val {
		t.Errorf("untyped.GetValue() = %v, want %v", got, val)
	}
}

func TestUntypedReset(t *testing.T) {
	untyped := &dto.Untyped{
		Value: proto.Float64(99.9),
	}
	untyped.Reset()
	if got := untyped.GetValue(); got != 0 {
		t.Errorf("untyped.GetValue() after Reset() = %v, want 0", got)
	}
}

func TestUntypedProtoReflect(t *testing.T) {
	untyped := &dto.Untyped{
		Value: proto.Float64(55.5),
	}
	msg := untyped.ProtoReflect()
	if !msg.IsValid() {
		t.Error("untyped.ProtoReflect() is invalid")
	}
	valField := msg.Descriptor().Fields().ByName("value")
	if valField == nil {
		t.Fatal("untyped descriptor missing 'value' field")
	}
	if msg.Get(valField).Float() != 55.5 {
		t.Errorf("msg.Get(valField).Float() = %v, want 55.5", msg.Get(valField).Float())
	}
}

func TestUntypedMetricIntegration(t *testing.T) {
	val := 77.7
	metric := &dto.Metric{
		Untyped: &dto.Untyped{
			Value: proto.Float64(val),
		},
	}
	if metric.GetUntyped() == nil {
		t.Fatal("metric.GetUntyped() returned nil")
	}
	if got := metric.GetUntyped().GetValue(); got != val {
		t.Errorf("metric.GetUntyped().GetValue() = %v, want %v", got, val)
	}

	metricFamily := &dto.MetricFamily{
		Name:   proto.String("test_untyped_metric"),
		Type:   dto.MetricType_UNTYPED.Enum(),
		Metric: []*dto.Metric{metric},
	}
	if metricFamily.GetType() != dto.MetricType_UNTYPED {
		t.Errorf("metricFamily.GetType() = %v, want %v", metricFamily.GetType(), dto.MetricType_UNTYPED)
	}
}