72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
package fejkdata
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import (
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"encoding/json"
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"fmt"
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"strings"
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"testing"
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)
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func TestRecursionHasNoDepthLimit(t *testing.T) {
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// Build {format:{a}, a:[{format:{a}, a:[ ... "deep" ]]}} 50 levels deep.
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tmpl := `"deep"`
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for i := 0; i < 50; i++ {
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tmpl = `{"format":"{a}","a":` + tmpl + `}`
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}
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if got := mustRender(t, engine(1), tmpl); got != "deep" {
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t.Fatalf("deep recursion = %q, want deep", got)
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}
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}
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// TestGrowIsALowerBound pins the property that makes the pre-sized render buffer
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// safe: grow must never exceed what expand emits. render multiplies it by repeat,
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// so an over-estimate would amplify up to a million-fold.
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func TestGrowIsALowerBound(t *testing.T) {
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f := engine(3)
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for _, format := range []string{
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"",
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"plain literal",
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"{digits(2)}-{int(1,9)}{int(1,9)}-{upper(2)}-{lower(2)}",
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"01Aa# literal",
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"{{}} {{{x}}}",
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"Ö dag åäö 日本語",
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"{x}{x}{x}",
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"{hex(8)}-{int(10,99)}-{nanoid(5)}",
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"9{d}{luhn()}",
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"{a|b} and {a|b}",
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} {
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src := `{"format":` + quote(format) + `,"x":"1","a":"A","b":"B","d":"012345678901234"}`
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tmpl, ok := compiled(t, src).(*template)
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if !ok {
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t.Fatalf("format %q did not compile to a template", format)
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}
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for i := 0; i < 50; i++ {
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var set holdSet
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if got := len(expand(f.rand, tmpl, renderScope{set: &set})); got < tmpl.compiled.grow {
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t.Errorf("format %q: expand emitted %d bytes, below grow %d", format, got, tmpl.compiled.grow)
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}
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}
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}
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}
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func quote(s string) string {
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b, err := json.Marshal(s)
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if err != nil {
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panic(err)
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}
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return string(b)
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}
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type unhandledNode struct{}
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func (*unhandledNode) isNode() {}
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func TestRenderEdgesPanicsOnAnUnhandledNode(t *testing.T) {
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defer func() {
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if r := recover(); r == nil || !strings.Contains(fmt.Sprint(r), "*fejkdata.unhandledNode") {
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t.Errorf("renderEdges(unhandledNode) recovered %v, want a panic naming the node kind", r)
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}
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}()
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renderEdges(&unhandledNode{})
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}
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