package template import ( "testing" "github.com/stretchr/testify/assert" ) var defaults = map[string]string{ "FOO": "first", "BAR": "", } func defaultMapping(name string) (string, bool) { val, ok := defaults[name] return val, ok } func TestEscaped(t *testing.T) { result, err := Substitute("$${foo}", defaultMapping) assert.Nil(t, err) assert.Equal(t, "${foo}", result) } func TestInvalid(t *testing.T) { invalidTemplates := []string{ "${", "$}", "${}", "${ }", "${ foo}", "${foo }", "${foo!}", } for _, template := range invalidTemplates { _, err := Substitute(template, defaultMapping) assert.Error(t, err) assert.IsType(t, &InvalidTemplateError{}, err) } } func TestNoValueNoDefault(t *testing.T) { for _, template := range []string{"This ${missing} var", "This ${BAR} var"} { result, err := Substitute(template, defaultMapping) assert.Nil(t, err) assert.Equal(t, "This var", result) } } func TestValueNoDefault(t *testing.T) { for _, template := range []string{"This $FOO var", "This ${FOO} var"} { result, err := Substitute(template, defaultMapping) assert.Nil(t, err) assert.Equal(t, "This first var", result) } } func TestNoValueWithDefault(t *testing.T) { for _, template := range []string{"ok ${missing:-def}", "ok ${missing-def}"} { result, err := Substitute(template, defaultMapping) assert.Nil(t, err) assert.Equal(t, "ok def", result) } } func TestEmptyValueWithSoftDefault(t *testing.T) { result, err := Substitute("ok ${BAR:-def}", defaultMapping) assert.Nil(t, err) assert.Equal(t, "ok def", result) } func TestEmptyValueWithHardDefault(t *testing.T) { result, err := Substitute("ok ${BAR-def}", defaultMapping) assert.Nil(t, err) assert.Equal(t, "ok ", result) } func TestNonAlphanumericDefault(t *testing.T) { result, err := Substitute("ok ${BAR:-/non:-alphanumeric}", defaultMapping) assert.Nil(t, err) assert.Equal(t, "ok /non:-alphanumeric", result) }