Testing program

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1 
func TestAvg2(t *testing.T) {
	type test struct {
		data   []float64
		answer float64
	}

	tests := []test{
		test{[]float64{2, 2}, 2.00},
		test{[]float64{4, 4}, 4.00},
		test{[]float64{3, 3, 4}, 3.33},
		test{[]float64{3, 3, 5}, 3.67},
		test{[]float64{5, 5, 5}, 5.00},
		test{[]float64{-10, 10, 10, 11}, 5.25},
	}

	for _, v := range tests {
		x := Avg(v.data...)
		str := fmt.Sprintf("%.2f", x)
		fl, _ := strconv.ParseFloat(str, 64)
		if x != v.answer {
			t.Error("Expected", v.answer, "got", fl)
		}
	}
}

Results:
table_test.go:29: Expected 3.33 got 3.33
table_test.go:29: Expected 3.67 got 3.67

What’s wrong?

2

Rounding errors. Thats what floats are known for.

For floats one usually checks if the absolute of the difference between two values is lesser than or equal a certain threshold, and considers them equal if the difference is small enough.

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