test: add unit tests for hostagent package

internal/hostagent/agent_test.go

@@ -0,0 +1,140 @@
+package hostagent
+
+import (
+	"testing"
+	"time"
+
+	"github.com/rs/zerolog"
+)
+
+func TestNormalisePlatform(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+	}{
+		{"darwin", "macos"},
+		{"Darwin", "macos"},
+		{"DARWIN", "macos"},
+		{" darwin ", "macos"},
+		{"linux", "linux"},
+		{"Linux", "linux"},
+		{"windows", "windows"},
+		{"freebsd", "freebsd"},
+		{"", ""},
+		{"  ", ""},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.input, func(t *testing.T) {
+			result := normalisePlatform(tc.input)
+			if result != tc.expected {
+				t.Errorf("normalisePlatform(%q) = %q, want %q", tc.input, result, tc.expected)
+			}
+		})
+	}
+}
+
+func TestIsLoopback(t *testing.T) {
+	tests := []struct {
+		name     string
+		flags    []string
+		expected bool
+	}{
+		{
+			name:     "has loopback",
+			flags:    []string{"up", "loopback", "running"},
+			expected: true,
+		},
+		{
+			name:     "has LOOPBACK uppercase",
+			flags:    []string{"UP", "LOOPBACK", "RUNNING"},
+			expected: true,
+		},
+		{
+			name:     "has Loopback mixed case",
+			flags:    []string{"up", "Loopback", "running"},
+			expected: true,
+		},
+		{
+			name:     "no loopback",
+			flags:    []string{"up", "broadcast", "running"},
+			expected: false,
+		},
+		{
+			name:     "empty flags",
+			flags:    []string{},
+			expected: false,
+		},
+		{
+			name:     "nil flags",
+			flags:    nil,
+			expected: false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			result := isLoopback(tc.flags)
+			if result != tc.expected {
+				t.Errorf("isLoopback(%v) = %v, want %v", tc.flags, result, tc.expected)
+			}
+		})
+	}
+}
+
+func TestNewAgent_MissingToken(t *testing.T) {
+	cfg := Config{
+		PulseURL: "http://localhost:7655",
+		APIToken: "",
+	}
+
+	_, err := New(cfg)
+	if err == nil {
+		t.Error("New() should fail when API token is missing")
+	}
+}
+
+func TestNewAgent_WhitespaceToken(t *testing.T) {
+	cfg := Config{
+		PulseURL: "http://localhost:7655",
+		APIToken: "   ",
+	}
+
+	_, err := New(cfg)
+	if err == nil {
+		t.Error("New() should fail when API token is only whitespace")
+	}
+}
+
+func TestNewAgent_DefaultInterval(t *testing.T) {
+	// We can't easily test New() without mocking gohost.InfoWithContext
+	// but we can verify the default interval constant
+	if defaultInterval != 30*time.Second {
+		t.Errorf("defaultInterval = %v, want %v", defaultInterval, 30*time.Second)
+	}
+}
+
+func TestConfig_Defaults(t *testing.T) {
+	cfg := Config{}
+
+	// Verify zero values
+	if cfg.Interval != 0 {
+		t.Errorf("Config.Interval should be zero by default, got %v", cfg.Interval)
+	}
+	if cfg.InsecureSkipVerify {
+		t.Error("Config.InsecureSkipVerify should be false by default")
+	}
+	if cfg.RunOnce {
+		t.Error("Config.RunOnce should be false by default")
+	}
+	if cfg.LogLevel != zerolog.Level(0) {
+		t.Errorf("Config.LogLevel should be 0 (TraceLevel) by default, got %v", cfg.LogLevel)
+	}
+}
+
+func TestVersion(t *testing.T) {
+	// Verify Version is set (build-time override or default)
+	if Version == "" {
+		t.Error("Version should not be empty")
+	}
+}