1 files changed, 84 insertions, 0 deletions
diff --git a/internal/ca/install_test.go b/internal/ca/install_test.go
new file mode 100644
index 0000000..0f01f1f
--- /dev/null
+++ b/internal/ca/install_test.go
@@ -0,0 +1,84 @@
+package ca
+
+import (
+	"strings"
+	"testing"
+)
+
+// withCommands temporarily replaces commandExists with a fake that only
+// reports the given names as present, restoring the real one after.
+func withCommands(t *testing.T, present ...string) {
+	t.Helper()
+	set := make(map[string]bool, len(present))
+	for _, p := range present {
+		set[p] = true
+	}
+	orig := commandExists
+	commandExists = func(name string) bool { return set[name] }
+	t.Cleanup(func() { commandExists = orig })
+}
+
+func TestLinuxInstructionsPrefersTrust(t *testing.T) {
+	withCommands(t, "trust", "update-ca-trust", "update-ca-certificates")
+	got := linuxInstructions("/tmp/ca.pem")
+	if !strings.Contains(got, "sudo trust anchor --store /tmp/ca.pem") {
+		t.Errorf("expected trust anchor command when trust is available, got:\n%s", got)
+	}
+}
+
+func TestLinuxInstructionsFallsBackToUpdateCaTrust(t *testing.T) {
+	withCommands(t, "update-ca-trust")
+	got := linuxInstructions("/tmp/ca.pem")
+	if !strings.Contains(got, "update-ca-trust") || strings.Contains(got, "trust anchor") {
+		t.Errorf("expected update-ca-trust path, got:\n%s", got)
+	}
+}
+
+func TestLinuxInstructionsFallsBackToUpdateCaCertificates(t *testing.T) {
+	withCommands(t, "update-ca-certificates")
+	got := linuxInstructions("/tmp/ca.pem")
+	if !strings.Contains(got, "update-ca-certificates") {
+		t.Errorf("expected update-ca-certificates path, got:\n%s", got)
+	}
+}
+
+func TestLinuxInstructionsNoneFound(t *testing.T) {
+	withCommands(t)
+	got := linuxInstructions("/tmp/ca.pem")
+	if !strings.Contains(got, "No known trust-store tool") {
+		t.Errorf("expected a no-tool-found message, got:\n%s", got)
+	}
+}
+
+func TestLinuxInstructionsCertutilPresence(t *testing.T) {
+	withCommands(t, "certutil")
+	withCert := linuxInstructions("/tmp/ca.pem")
+	if !strings.Contains(withCert, "certutil -d sql:") {
+		t.Errorf("expected certutil NSS instructions when certutil is present, got:\n%s", withCert)
+	}
+
+	withCommands(t)
+	withoutCert := linuxInstructions("/tmp/ca.pem")
+	if !strings.Contains(withoutCert, "Import manually") {
+		t.Errorf("expected manual-import fallback when certutil is absent, got:\n%s", withoutCert)
+	}
+}
+
+func TestInstallInstructionsDispatchesByOS(t *testing.T) {
+	withCommands(t)
+	tests := []struct {
+		goos string
+		want string
+	}{
+		{"linux", "trust store"},
+		{"darwin", "security add-trusted-cert"},
+		{"windows", "certutil -addstore"},
+		{"plan9", "No install steps known"},
+	}
+	for _, tt := range tests {
+		got := InstallInstructions(tt.goos, "/tmp/ca.pem")
+		if !strings.Contains(got, tt.want) {
+			t.Errorf("InstallInstructions(%q, ...) = %q, want it to contain %q", tt.goos, got, tt.want)
+		}
+	}
+}