Adding must that panics if value doesnt exist

CONTRIBUTING.md

@@ -2,19 +2,19 @@
 
 ## Setup your machine
 
-`example` is written in [Go](https://golang.org/).
+`optional` is written in [Go](https://golang.org/).
 
 Prerequisites are:
 
 * Build:
   * `make`
-  * [Go 1.8+](http://golang.org/doc/install)
+  * [Go 1.10+](http://golang.org/doc/install)
 
-Clone `example` from source into `$GOPATH`:
+Clone `optional` from source into `$GOPATH`:
 
 ```sh
-$ go get github.com/markphelps/example
-$ cd $GOPATH/src/github.com/markphelps/example
+$ go get github.com/markphelps/optional
+$ cd $GOPATH/src/github.com/markphelps/optional
 ```
 
 Install the build and lint dependencies:
@@ -47,5 +47,5 @@ Which runs all the linters and tests.
 
 ## Submit a pull request
 
-Push your branch to your `example` fork and open a pull request against the
+Push your branch to your `optional` fork and open a pull request against the
 master branch.

Makefile

@@ -1,26 +1,30 @@
 GOTOOLS = \
 	github.com/golang/dep/cmd/dep \
 	github.com/golangci/golangci-lint/cmd/golangci-lint \
-	golang.org/x/tools/cmd/cover \
+
+SOURCE_FILES?=./...
+TEST_PATTERN?=.
+TEST_OPTIONS?=
 
 .PHONY: setup
 setup: ## Install all the build and lint dependencies
 	@echo "--> Installing tools"
-	@go get -u $(GOTOOLS)
+	go get -u $(GOTOOLS)
 
 .PHONY: dep
 dep: ## Install all import dependencies
 	@echo "--> Installing dependencies"
-	@dep ensure
+	dep ensure
 
 .PHONY: test
 test: ## Run all the tests
 	@echo "--> Running tests"
-	@echo 'mode: atomic' > coverage.txt && go list ./... | grep -v /vendor/ | xargs -n1 -I{} sh -c 'go test -covermode=atomic -coverprofile=coverage.txt -v -race -timeout=30s {}'
+	go test $(TEST_OPTIONS) -failfast $(SOURCE_FILES) -run $(TEST_PATTERN) -timeout=1m
 
-.PHONY: cover
-cover: test ## Run all the tests and opens the coverage report
-	go tool cover -html=coverage.txt
+.PHONY: golden
+golden: ## Updates goldenfiles and runs tests
+	@echo "--> Updating goldenfiles"
+	go test ./cmd/optional/... -update
 
 .PHONY: fmt
 fmt: ## gofmt and goimports all go files
@@ -30,20 +34,20 @@ fmt: ## gofmt and goimports all go files
 .PHONY: lint
 lint: ## Run all the linters
 	@echo "--> Running linters"
-	@golangci-lint run
+	golangci-lint run
 
 .PHONY: ci
 ci: lint test ## Run all the tests and code checks
 
 .PHONY: generate
 generate: ## Run go generate
 	@echo "--> Running go generate"
-	@go generate
+	go generate
 
 .PHONY: build
 build: ## Build
 	@echo "--> Building ..."
-	@go build -o bin/optional ./cmd/optional/main.go
+	go build -o bin/optional ./cmd/optional/main.go
 
 # Absolutely awesome: http://marmelab.com/blog/2016/02/29/auto-documented-makefile.html
 .PHONY: help

cmd/optional/main.go

@@ -159,6 +159,14 @@ func ({{ .VariableName }} {{ .OutputName }}) Get() ({{ .TypeName }}, error) {
 	return *{{ .VariableName }}.value, nil
 }
 
+// Must returns the {{ .TypeName }} value or panics if not present.
+func ({{ .VariableName }} {{ .OutputName }}) Must() {{ .TypeName }} {
+	if !{{ .VariableName }}.Present() {
+		panic("value not present")
+	}
+	return *{{ .VariableName }}.value
+}
+
 // Present returns whether or not the value is present.
 func ({{ .VariableName }} {{ .OutputName }}) Present() bool {
 	return {{ .VariableName }}.value != nil