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// Copyright 2017 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package measurement
import (
"math"
"testing"
)
func TestScale(t *testing.T) {
for _, tc := range []struct {
value int64
fromUnit, toUnit string
wantValue float64
wantUnit string
}{
{1, "s", "ms", 1000, "ms"},
{1, "kb", "b", 1024, "B"},
{1, "kbyte", "b", 1024, "B"},
{1, "kilobyte", "b", 1024, "B"},
{1, "mb", "kb", 1024, "kB"},
{1, "gb", "mb", 1024, "MB"},
{1024, "gb", "tb", 1, "TB"},
{1024, "tb", "pb", 1, "PB"},
{2048, "mb", "auto", 2, "GB"},
{3.1536e7, "s", "auto", 8760, "hrs"},
{-1, "s", "ms", -1000, "ms"},
{1, "foo", "count", 1, ""},
{1, "foo", "bar", 1, "bar"},
{2000, "count", "count", 2000, ""},
{2000, "count", "auto", 2000, ""},
{2000, "count", "minimum", 2000, ""},
{8e10, "nanogcu", "petagcus", 8e-14, "P*GCU"},
{1.5e10, "microGCU", "teraGCU", 1.5e-8, "T*GCU"},
{3e6, "milliGCU", "gigagcu", 3e-6, "G*GCU"},
{1000, "kilogcu", "megagcu", 1, "M*GCU"},
{2000, "GCU", "kiloGCU", 2, "k*GCU"},
{7, "megaGCU", "gcu", 7e6, "GCU"},
{5, "gigagcus", "milligcu", 5e12, "m*GCU"},
{7, "teragcus", "microGCU", 7e18, "u*GCU"},
{1, "petaGCU", "nanogcus", 1e24, "n*GCU"},
{100, "NanoGCU", "auto", 100, "n*GCU"},
{5000, "nanogcu", "auto", 5, "u*GCU"},
{3000, "MicroGCU", "auto", 3, "m*GCU"},
{4000, "MilliGCU", "auto", 4, "GCU"},
{4000, "GCU", "auto", 4, "k*GCU"},
{5000, "KiloGCU", "auto", 5, "M*GCU"},
{6000, "MegaGCU", "auto", 6, "G*GCU"},
{7000, "GigaGCU", "auto", 7, "T*GCU"},
{8000, "TeraGCU", "auto", 8, "P*GCU"},
{9000, "PetaGCU", "auto", 9000, "P*GCU"},
} {
if gotValue, gotUnit := Scale(tc.value, tc.fromUnit, tc.toUnit); !floatEqual(gotValue, tc.wantValue) || gotUnit != tc.wantUnit {
t.Errorf("Scale(%d, %q, %q) = (%g, %q), want (%g, %q)",
tc.value, tc.fromUnit, tc.toUnit, gotValue, gotUnit, tc.wantValue, tc.wantUnit)
}
}
}
func floatEqual(a, b float64) bool {
diff := math.Abs(a - b)
avg := (math.Abs(a) + math.Abs(b)) / 2
return diff/avg < 0.0001
}
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