Add implementation tests

log/go.mod

@@ -2,7 +2,16 @@ module go.opentelemetry.io/otel/log
 
 go 1.20
 
-require go.opentelemetry.io/otel v1.23.1
+require (
+	github.com/stretchr/testify v1.8.4
+	go.opentelemetry.io/otel v1.23.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
 
 replace go.opentelemetry.io/otel/metric => ../metric
 

log/go.sum

@@ -1,5 +1,11 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

log/noop/noop_test.go

@@ -0,0 +1,81 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package noop // import "go.opentelemetry.io/otel/log/noop"
+
+import (
+	"context"
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"go.opentelemetry.io/otel/log"
+)
+
+func TestImplementationNoPanics(t *testing.T) {
+	// Check that if type has an embedded interface and that interface has
+	// methods added to it than the No-Op implementation implements them.
+	t.Run("LoggerProvider", assertAllExportedMethodNoPanic(
+		reflect.ValueOf(LoggerProvider{}),
+		reflect.TypeOf((*log.LoggerProvider)(nil)).Elem(),
+	))
+	t.Run("Logger", assertAllExportedMethodNoPanic(
+		reflect.ValueOf(Logger{}),
+		reflect.TypeOf((*log.Logger)(nil)).Elem(),
+	))
+}
+
+func assertAllExportedMethodNoPanic(rVal reflect.Value, rType reflect.Type) func(*testing.T) {
+	return func(t *testing.T) {
+		for n := 0; n < rType.NumMethod(); n++ {
+			mType := rType.Method(n)
+			if !mType.IsExported() {
+				t.Logf("ignoring unexported %s", mType.Name)
+				continue
+			}
+			m := rVal.MethodByName(mType.Name)
+			if !m.IsValid() {
+				t.Errorf("unknown method for %s: %s", rVal.Type().Name(), mType.Name)
+			}
+
+			numIn := mType.Type.NumIn()
+			if mType.Type.IsVariadic() {
+				numIn--
+			}
+			args := make([]reflect.Value, numIn)
+			ctx := context.Background()
+			for i := range args {
+				aType := mType.Type.In(i)
+				if aType.Name() == "Context" {
+					// Do not panic on a nil context.
+					args[i] = reflect.ValueOf(ctx)
+				} else {
+					args[i] = reflect.New(aType).Elem()
+				}
+			}
+
+			assert.NotPanicsf(t, func() {
+				_ = m.Call(args)
+			}, "%s.%s", rVal.Type().Name(), mType.Name)
+		}
+	}
+}
+
+func TestNewTracerProvider(t *testing.T) {
+	provider := NewLoggerProvider()
+	assert.Equal(t, provider, LoggerProvider{})
+	logger := provider.Logger("")
+	assert.Equal(t, logger, Logger{})
+}