| // 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 |
| } |