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https://github.com/gopl-zh/gopl-zh.github.com.git
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49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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package eval
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import (
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"fmt"
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"math"
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"testing"
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)
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//!+TestCoverage
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func TestCoverage(t *testing.T) {
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var tests = []struct {
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input string
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env Env
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want string // expected error from Parse/Check or result from Eval
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}{
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{"x % 2", nil, "unexpected '%'"},
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{"!true", nil, "unexpected '!'"},
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{"log(10)", nil, `unknown function "log"`},
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{"sqrt(1, 2)", nil, "call to sqrt has 2 args, want 1"},
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{"sqrt(A / pi)", Env{"A": 87616, "pi": math.Pi}, "167"},
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{"pow(x, 3) + pow(y, 3)", Env{"x": 9, "y": 10}, "1729"},
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{"5 / 9 * (F - 32)", Env{"F": -40}, "-40"},
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}
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for _, test := range tests {
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expr, err := Parse(test.input)
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if err == nil {
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err = expr.Check(map[Var]bool{})
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}
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if err != nil {
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if err.Error() != test.want {
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t.Errorf("%s: got %q, want %q", test.input, err, test.want)
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}
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continue
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}
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got := fmt.Sprintf("%.6g", expr.Eval(test.env))
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if got != test.want {
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t.Errorf("%s: %v => %s, want %s",
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test.input, test.env, got, test.want)
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}
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}
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}
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//!-TestCoverage
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