Add unit tests for dockeragent utility functions
Tests for calculateCPUPercent, calculateMemoryUsage, safeFloat, parseTime, trimLeadingSlash, and summarizeBlockIO. 28 test cases covering edge cases like zero deltas, cache handling, NaN/Inf, and case-insensitive op matching. Coverage improved from 8.0% to 11.7%.
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rcourtman
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1 changed files with 389 additions and 0 deletions
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@ -1,8 +1,12 @@
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package dockeragent
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import (
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"math"
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"reflect"
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"testing"
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"time"
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containertypes "github.com/docker/docker/api/types/container"
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)
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func TestNormalizeTargets(t *testing.T) {
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@ -108,3 +112,388 @@ func TestNormalizeRuntimeInvalid(t *testing.T) {
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t.Fatalf("expected error for unsupported runtime")
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}
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}
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func TestCalculateCPUPercent(t *testing.T) {
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tests := []struct {
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name string
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stats containertypes.StatsResponse
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hostCPUs int
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want float64
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}{
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{
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name: "normal calculation",
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stats: containertypes.StatsResponse{
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CPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 200000000, // 200ms
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},
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SystemUsage: 2000000000, // 2s
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OnlineCPUs: 4,
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},
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PreCPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 100000000, // 100ms
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},
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SystemUsage: 1000000000, // 1s
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},
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},
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hostCPUs: 4,
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want: 40.0, // (100ms / 1s) * 4 CPUs * 100
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},
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{
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name: "zero system delta returns zero",
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stats: containertypes.StatsResponse{
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CPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 200000000,
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},
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SystemUsage: 1000000000,
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OnlineCPUs: 4,
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},
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PreCPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 100000000,
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},
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SystemUsage: 1000000000, // same as current = zero delta
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},
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},
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hostCPUs: 4,
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want: 0,
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},
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{
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name: "zero total delta returns zero",
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stats: containertypes.StatsResponse{
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CPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 100000000,
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},
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SystemUsage: 2000000000,
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OnlineCPUs: 4,
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},
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PreCPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 100000000, // same as current
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},
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SystemUsage: 1000000000,
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},
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},
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hostCPUs: 4,
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want: 0,
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},
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{
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name: "uses PercpuUsage length when OnlineCPUs is zero",
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stats: containertypes.StatsResponse{
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CPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 200000000,
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PercpuUsage: []uint64{1, 2, 3, 4}, // 4 CPUs
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},
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SystemUsage: 2000000000,
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OnlineCPUs: 0,
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},
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PreCPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 100000000,
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},
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SystemUsage: 1000000000,
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},
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},
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hostCPUs: 8,
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want: 40.0, // uses PercpuUsage length (4), not hostCPUs
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},
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{
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name: "uses hostCPUs when OnlineCPUs and PercpuUsage both zero",
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stats: containertypes.StatsResponse{
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CPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 200000000,
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},
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SystemUsage: 2000000000,
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OnlineCPUs: 0,
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},
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PreCPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 100000000,
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},
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SystemUsage: 1000000000,
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},
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},
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hostCPUs: 2,
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want: 20.0, // uses hostCPUs (2)
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},
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{
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name: "returns zero when no CPU count available",
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stats: containertypes.StatsResponse{
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CPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 200000000,
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},
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SystemUsage: 2000000000,
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OnlineCPUs: 0,
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},
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PreCPUStats: containertypes.CPUStats{
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CPUUsage: containertypes.CPUUsage{
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TotalUsage: 100000000,
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},
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SystemUsage: 1000000000,
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},
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},
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hostCPUs: 0,
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want: 0,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := calculateCPUPercent(tt.stats, tt.hostCPUs)
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if math.Abs(got-tt.want) > 0.001 {
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t.Errorf("calculateCPUPercent() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestCalculateMemoryUsage(t *testing.T) {
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tests := []struct {
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name string
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stats containertypes.StatsResponse
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wantUsage int64
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wantLimit int64
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wantPercent float64
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}{
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{
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name: "normal calculation with cache",
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stats: containertypes.StatsResponse{
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MemoryStats: containertypes.MemoryStats{
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Usage: 1000000,
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Limit: 4000000,
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Stats: map[string]uint64{"cache": 200000},
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},
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},
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wantUsage: 800000,
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wantLimit: 4000000,
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wantPercent: 20.0,
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},
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{
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name: "no cache in stats",
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stats: containertypes.StatsResponse{
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MemoryStats: containertypes.MemoryStats{
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Usage: 1000000,
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Limit: 4000000,
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Stats: map[string]uint64{},
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},
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},
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wantUsage: 1000000,
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wantLimit: 4000000,
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wantPercent: 25.0,
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},
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{
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name: "cache larger than usage falls back to raw usage",
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stats: containertypes.StatsResponse{
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MemoryStats: containertypes.MemoryStats{
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Usage: 1000000,
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Limit: 4000000,
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Stats: map[string]uint64{"cache": 2000000}, // more than usage
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},
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},
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wantUsage: 1000000, // falls back to raw usage
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wantLimit: 4000000,
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wantPercent: 25.0,
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},
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{
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name: "zero limit returns zero percent",
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stats: containertypes.StatsResponse{
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MemoryStats: containertypes.MemoryStats{
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Usage: 1000000,
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Limit: 0,
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Stats: map[string]uint64{},
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},
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},
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wantUsage: 1000000,
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wantLimit: 0,
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wantPercent: 0,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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usage, limit, percent := calculateMemoryUsage(tt.stats)
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if usage != tt.wantUsage {
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t.Errorf("usage = %v, want %v", usage, tt.wantUsage)
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}
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if limit != tt.wantLimit {
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t.Errorf("limit = %v, want %v", limit, tt.wantLimit)
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}
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if math.Abs(percent-tt.wantPercent) > 0.001 {
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t.Errorf("percent = %v, want %v", percent, tt.wantPercent)
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}
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})
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}
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}
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func TestSafeFloat(t *testing.T) {
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tests := []struct {
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name string
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input float64
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want float64
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}{
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{"normal positive", 42.5, 42.5},
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{"normal negative", -42.5, -42.5},
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{"zero", 0, 0},
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{"NaN returns zero", math.NaN(), 0},
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{"positive infinity returns zero", math.Inf(1), 0},
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{"negative infinity returns zero", math.Inf(-1), 0},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := safeFloat(tt.input)
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if got != tt.want {
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t.Errorf("safeFloat(%v) = %v, want %v", tt.input, got, tt.want)
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}
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})
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}
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}
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func TestParseTime(t *testing.T) {
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tests := []struct {
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name string
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input string
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want time.Time
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}{
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{"empty string", "", time.Time{}},
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{"zero time string", "0001-01-01T00:00:00Z", time.Time{}},
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{"RFC3339Nano", "2024-01-15T10:30:00.123456789Z", time.Date(2024, 1, 15, 10, 30, 0, 123456789, time.UTC)},
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{"RFC3339", "2024-01-15T10:30:00Z", time.Date(2024, 1, 15, 10, 30, 0, 0, time.UTC)},
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{"RFC3339 with offset", "2024-01-15T10:30:00+05:00", time.Date(2024, 1, 15, 10, 30, 0, 0, time.FixedZone("", 5*3600))},
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{"invalid format", "not-a-time", time.Time{}},
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{"partial date", "2024-01-15", time.Time{}},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := parseTime(tt.input)
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if !got.Equal(tt.want) {
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t.Errorf("parseTime(%q) = %v, want %v", tt.input, got, tt.want)
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}
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})
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}
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}
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func TestTrimLeadingSlash(t *testing.T) {
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tests := []struct {
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name string
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names []string
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want string
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}{
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{"empty slice", []string{}, ""},
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{"single name with slash", []string{"/mycontainer"}, "mycontainer"},
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{"single name without slash", []string{"mycontainer"}, "mycontainer"},
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{"multiple names uses first", []string{"/first", "/second"}, "first"},
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{"name with multiple slashes only trims first", []string{"//double"}, "/double"},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := trimLeadingSlash(tt.names)
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if got != tt.want {
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t.Errorf("trimLeadingSlash(%v) = %q, want %q", tt.names, got, tt.want)
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}
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})
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}
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}
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func TestSummarizeBlockIO(t *testing.T) {
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tests := []struct {
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name string
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stats containertypes.StatsResponse
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want *containertypes.BlkioStatEntry
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}{
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{
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name: "read and write ops",
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stats: containertypes.StatsResponse{
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BlkioStats: containertypes.BlkioStats{
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IoServiceBytesRecursive: []containertypes.BlkioStatEntry{
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{Op: "Read", Value: 1000},
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{Op: "Write", Value: 2000},
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{Op: "Read", Value: 500}, // multiple read entries
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{Op: "Write", Value: 300}, // multiple write entries
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},
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},
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},
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want: &containertypes.BlkioStatEntry{}, // will check values separately
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},
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{
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name: "case insensitive ops",
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stats: containertypes.StatsResponse{
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BlkioStats: containertypes.BlkioStats{
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IoServiceBytesRecursive: []containertypes.BlkioStatEntry{
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{Op: "READ", Value: 100},
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{Op: "write", Value: 200},
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},
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},
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},
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want: &containertypes.BlkioStatEntry{},
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},
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{
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name: "zero values returns nil",
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stats: containertypes.StatsResponse{
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BlkioStats: containertypes.BlkioStats{
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IoServiceBytesRecursive: []containertypes.BlkioStatEntry{},
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},
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},
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want: nil,
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},
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{
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name: "only non-read-write ops returns nil",
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stats: containertypes.StatsResponse{
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BlkioStats: containertypes.BlkioStats{
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IoServiceBytesRecursive: []containertypes.BlkioStatEntry{
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{Op: "Sync", Value: 1000},
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{Op: "Async", Value: 2000},
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},
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},
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},
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want: nil,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := summarizeBlockIO(tt.stats)
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if tt.want == nil {
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if got != nil {
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t.Errorf("summarizeBlockIO() = %v, want nil", got)
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}
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return
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}
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if got == nil {
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t.Errorf("summarizeBlockIO() = nil, want non-nil")
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return
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}
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})
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}
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// Additional test for exact values
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t.Run("exact read/write values", func(t *testing.T) {
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stats := containertypes.StatsResponse{
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BlkioStats: containertypes.BlkioStats{
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IoServiceBytesRecursive: []containertypes.BlkioStatEntry{
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{Op: "Read", Value: 1000},
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{Op: "Write", Value: 2000},
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{Op: "Read", Value: 500},
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},
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},
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}
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got := summarizeBlockIO(stats)
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if got == nil {
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t.Fatal("expected non-nil result")
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}
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if got.ReadBytes != 1500 {
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t.Errorf("ReadBytes = %d, want 1500", got.ReadBytes)
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}
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if got.WriteBytes != 2000 {
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t.Errorf("WriteBytes = %d, want 2000", got.WriteBytes)
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}
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})
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}
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