google.golang.org/appengine v1.2.0: GeoPoint

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 google.golang.org/appengine.GeoPoint in pkg:golang/google.golang.org/appengine@v1.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/appengine@v1.2.0
Demonstrate these symbols/APIs:
  - google.golang.org/appengine.GeoPoint

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:sha256:65f05fdacd8ef71b29e62d33abec40b90c22985a753cc1f221d3e745f90196f6","contract":["appengine.GeoPoint{Lat: 0, Lng: 0}.Valid() returns true and preserves Lat/Lng fields","appengine.GeoPoint.Valid() returns true on boundary values Lat in [-90, 90] and Lng in [-180, 180]","appengine.GeoPoint.Valid() returns false when Lat is outside [-90, 90] or Lng is outside [-180, 180]"],"goal":"verify google.golang.org/appengine.GeoPoint in pkg:golang/google.golang.org/appengine@v1.2.0","kind":"HOW","packages":["pkg:golang/google.golang.org/appengine@v1.2.0"],"schemaVersion":1,"symbols":["google.golang.org/appengine.GeoPoint"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/google.golang.org/appengine@v1.2.0"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/appengine@v1.2.0","symbols":["google.golang.org/appengine.GeoPoint"],"verifierAdapter":"golang@1"}

module sample

go 1.26.0

require google.golang.org/appengine v1.2.0

require (
	github.com/golang/protobuf v1.2.0 // indirect
	golang.org/x/net v0.0.0-20180724234803-3673e40ba225 // indirect
	golang.org/x/sync v0.24.0 // indirect
)

github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225 h1:kNX+jCowfMYzvlSvJu5pQWEmyWFrBXJ3PBy10xKMXK8=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/sync v0.24.0 h1:iqiDrGoDgyuvAKrhLQthUEzU/R378N78gXbBjxed7oA=
golang.org/x/sync v0.24.0/go.mod h1:sUUOizhqBxiL6pEWpqNLUiaJn1ShEbZ6BBqskPbjZm0=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
google.golang.org/appengine v1.2.0 h1:S0iUepdCWODXRvtE+gcRDd15L+k+k1AiHlMiMjefH24=
google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=

package main

import (
	"fmt"

	"google.golang.org/appengine"
)

func NewLocation(lat, lng float64) (appengine.GeoPoint, bool) {
	gp := appengine.GeoPoint{Lat: lat, Lng: lng}
	return gp, gp.Valid()
}

func main() {
	gp, ok := NewLocation(37.7749, -122.4194)
	fmt.Printf("GeoPoint(%v, %v) valid=%v\n", gp.Lat, gp.Lng, ok)
}

{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/appengine.GeoPoint in pkg:golang/google.golang.org/appengine@v1.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/appengine@v1.2.0"
  ],
  "symbols": [
    "google.golang.org/appengine.GeoPoint"
  ]
}

package main

import (
	"fmt"
	"os"

	"google.golang.org/appengine"
)

func main() {
	validOrigin := appengine.GeoPoint{Lat: 0, Lng: 0}
	if !validOrigin.Valid() || validOrigin.Lat != 0 || validOrigin.Lng != 0 {
		fmt.Fprintf(os.Stderr, "expected origin (0, 0) to be valid\n")
		os.Exit(1)
	}

	validBounds := []appengine.GeoPoint{
		{Lat: 90, Lng: 180},
		{Lat: -90, Lng: -180},
		{Lat: 37.7749, Lng: -122.4194},
	}
	for _, gp := range validBounds {
		if !gp.Valid() {
			fmt.Fprintf(os.Stderr, "expected %+v to be valid\n", gp)
			os.Exit(1)
		}
	}

	invalidBounds := []appengine.GeoPoint{
		{Lat: 90.0001, Lng: 0},
		{Lat: -90.0001, Lng: 0},
		{Lat: 0, Lng: 180.0001},
		{Lat: 0, Lng: -180.0001},
	}
	for _, gp := range invalidBounds {
		if gp.Valid() {
			fmt.Fprintf(os.Stderr, "expected %+v to be invalid\n", gp)
			os.Exit(1)
		}
	}
}