mirror of
https://github.com/danog/liquid.git
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73 lines
2.3 KiB
Go
73 lines
2.3 KiB
Go
package expressions
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import (
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"fmt"
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"testing"
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"github.com/osteele/liquid/values"
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"github.com/stretchr/testify/require"
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)
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func TestContext_AddFilter(t *testing.T) {
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cfg := NewConfig()
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require.NotPanics(t, func() { cfg.AddFilter("f", func(int) int { return 0 }) })
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require.NotPanics(t, func() { cfg.AddFilter("f", func(int) (a int, e error) { return }) })
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require.Panics(t, func() { cfg.AddFilter("f", func() int { return 0 }) })
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require.Panics(t, func() { cfg.AddFilter("f", func(int) {}) })
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// require.Panics(t, func() { cfg.AddFilter("f", func(int) (a int, b int) { return }) })
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require.Panics(t, func() { cfg.AddFilter("f", func(int) (a int, e error, b int) { return }) })
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require.Panics(t, func() { cfg.AddFilter("f", 10) })
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}
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func TestContext_runFilter(t *testing.T) {
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cfg := NewConfig()
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constant := func(value interface{}) valueFn {
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return func(Context) values.Value { return values.ValueOf(value) }
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}
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receiver := constant("self")
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// basic
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cfg.AddFilter("f1", func(s string) string {
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return "<" + s + ">"
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})
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ctx := NewContext(map[string]interface{}{"x": 10}, cfg)
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out, err := ctx.ApplyFilter("f1", receiver, []valueFn{})
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require.NoError(t, err)
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require.Equal(t, "<self>", out)
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// filter argument
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cfg.AddFilter("with_arg", func(a, b string) string {
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return fmt.Sprintf("(%s, %s)", a, b)
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})
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ctx = NewContext(map[string]interface{}{"x": 10}, cfg)
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out, err = ctx.ApplyFilter("with_arg", receiver, []valueFn{constant("arg")})
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require.NoError(t, err)
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require.Equal(t, "(self, arg)", out)
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// TODO optional argument
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// TODO error return
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// extra argument
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_, err = ctx.ApplyFilter("with_arg", receiver, []valueFn{constant(1), constant(2)})
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require.Error(t, err)
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require.Contains(t, err.Error(), "wrong number of arguments")
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require.Contains(t, err.Error(), "given 2")
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require.Contains(t, err.Error(), "expected 1")
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// closure
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cfg.AddFilter("add", func(a, b int) int {
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return a + b
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})
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cfg.AddFilter("closure", func(a string, expr Closure) (string, error) {
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value, e := expr.Bind("y", 1).Evaluate()
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if e != nil {
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return "", e
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}
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return fmt.Sprintf("(%v, %v)", a, value), nil
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})
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ctx = NewContext(map[string]interface{}{"x": 10}, cfg)
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out, err = ctx.ApplyFilter("closure", receiver, []valueFn{constant("x |add: y")})
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require.NoError(t, err)
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require.Equal(t, "(self, 11)", out)
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}
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