Remove unneeded metrictest types (#2864)

* Remove unneeded metrictest types

* Add changes to changelog

* Revert removal of NewDescriptor

CHANGELOG.md

@@ -42,6 +42,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - The `MergeIterator.Label` method in the `go.opentelemetry.io/otel/attribute` package is deprecated.
   Use the equivalent `MergeIterator.Attribute` method instead. (#2790)
 
+### Removed
+
+- Removed the `Batch` type from the `go.opentelemetry.io/otel/sdk/metric/metrictest` package. (#2864)
+- Removed the `Measurement` type from the `go.opentelemetry.io/otel/sdk/metric/metrictest` package. (#2864)
+
 ## [0.29.0] - 2022-04-11
 
 ### Added

sdk/metric/metrictest/exporter.go

@@ -20,12 +20,14 @@ import (
 
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/instrument"
 	"go.opentelemetry.io/otel/sdk/instrumentation"
 	controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
 	"go.opentelemetry.io/otel/sdk/metric/export"
 	"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
 	"go.opentelemetry.io/otel/sdk/metric/number"
 	processor "go.opentelemetry.io/otel/sdk/metric/processor/basic"
+	"go.opentelemetry.io/otel/sdk/metric/sdkapi"
 	selector "go.opentelemetry.io/otel/sdk/metric/selector/simple"
 )
 
@@ -62,6 +64,14 @@ func NewTestMeterProvider(opts ...Option) (metric.MeterProvider, *Exporter) {
 	return c, exp
 }
 
+// Library is the same as "sdk/instrumentation".Library but there is
+// a package cycle to use it so it is redeclared here.
+type Library struct {
+	InstrumentationName    string
+	InstrumentationVersion string
+	SchemaURL              string
+}
+
 // ExportRecord represents one collected datapoint from the Exporter.
 type ExportRecord struct {
 	InstrumentName         string
@@ -178,3 +188,10 @@ func subSet(attributesA, attributesB []attribute.KeyValue) bool {
 	}
 	return true
 }
+
+// NewDescriptor is a test helper for constructing test metric
+// descriptors using standard options.
+func NewDescriptor(name string, ikind sdkapi.InstrumentKind, nkind number.Kind, opts ...instrument.Option) sdkapi.Descriptor {
+	cfg := instrument.NewConfig(opts...)
+	return sdkapi.NewDescriptor(name, ikind, nkind, cfg.Description(), cfg.Unit())
+}