32 lines
887 B
Go
32 lines
887 B
Go
package grammar
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import (
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"reflect"
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"testing"
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)
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func TestParseCalcPlacesEachOperandAtItsFirstReading(t *testing.T) {
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c, err := ParseCalc("b * (a - b) / -2")
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if err != nil {
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t.Fatal(err)
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}
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want := CalcBin{'/', CalcBin{'*', CalcVar{"b", 0}, CalcBin{'-', CalcVar{"a", 1}, CalcVar{"b", 0}}}, CalcNeg{CalcNum(2)}}
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if !reflect.DeepEqual(c.Expr, want) {
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t.Errorf("ParseCalc = %#v, want %#v", c.Expr, want)
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}
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if !reflect.DeepEqual(c.Operands, []string{"b", "a"}) {
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t.Errorf("Operands = %q, want [b a]", c.Operands)
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}
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if got := CalcText(c.Expr); got != "((b * (a - b)) / -2)" {
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t.Errorf("CalcText = %q", got)
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}
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}
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func TestParseCalcRefusesAnUnfinishedExpression(t *testing.T) {
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for _, expr := range []string{"", " ", "1 +", "(1", "1 2", "a.b", "postal-code *"} {
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if _, err := ParseCalc(expr); err == nil {
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t.Errorf("ParseCalc(%q) = nil error, want one", expr)
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}
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}
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}
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