22 lines
623 B
Go
22 lines
623 B
Go
package runtime_test
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import (
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"testing"
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)
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func TestIncDec(t *testing.T) {
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expect(t, `out++`, 1)
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expect(t, `out--`, -1)
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expect(t, `a := 0; a++; out = a`, 1)
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expect(t, `a := 0; a++; a--; out = a`, 0)
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// this seems strange but it works because 'a += b' is
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// translated into 'a = a + b' and string type takes other types for + operator.
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expect(t, `a := "foo"; a++; out = a`, "foo1")
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expectError(t, `a := "foo"; a--`)
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expectError(t, `a++`) // not declared
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expectError(t, `a--`) // not declared
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//expectError(t, `a := 0; b := a++`) // inc-dec is statement not expression <- parser error
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expectError(t, `4++`)
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}
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