50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
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package expr
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import (
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"fmt"
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"testing"
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)
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func TestExpr(t *testing.T) {
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tests := []struct {
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expr string
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env Env
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want string
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}{
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{"$1 > 80 && $2 <9", Env{"$1": 100, "$2": 2}, "true"},
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{"$1 % 10", Env{"$1": 104, "$2": 2}, "4"},
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{"pow(x, false) + pow(y, false)", Env{"x": 12, "y": 1}, "2"},
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{"pow(x, 3) + pow(y, 3)", Env{"x": 9, "y": 10}, "1729"},
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{"5.0 / 9 * (F - 32)", Env{"F": -40}, "-40"},
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{"5.0 / 9 * (F - 32)", Env{"F": 32}, "0"},
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{"5.0 / 9 * (F - 32)", Env{"F": 212}, "100"},
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////!-Eval
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//// additional tests that don't appear in the book
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{"-1 + -x", Env{"x": 1}, "-2"},
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{"-1 - x", Env{"x": 1}, "-2"},
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{"a >= 10", Env{"a": 15}, "true"},
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{"b >= sin(10) && a < 1", Env{"a": 9, "b": 10}, "false"},
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{"!!!true", Env{"a": 9, "b": 10}, "false"},
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//!+Eval
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}
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var prevExpr string
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parser := NewExpressionParser()
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for _, test := range tests {
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// Print expr only when it changes.
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if test.expr != prevExpr {
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t.Logf("\n%s\n", test.expr)
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prevExpr = test.expr
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}
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if err := parser.Parse(test.expr); err != nil {
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t.Error(err) // parse error
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continue
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}
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got := fmt.Sprintf("%v", parser.GetExpr().Eval(test.env))
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t.Logf("\t%v => %s\n", test.env, got)
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if got != test.want {
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t.Errorf("%s.Eval() in %v = %q, want %q\n",
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test.expr, test.env, got, test.want)
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}
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}
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}
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