test: Add coverage for inventory branch, ambiguous context, and TranscriptReader error (#78)

- TestRun_InventoryZeroCounts: exercises the inventory code path in run()
- TestHandler_AmbiguousContextCommand: covers multiplePromptMatches fallthrough
  in handleShellInput when context search returns ambiguous results
- TestHandler_TranscriptReaderError already existed but confirms the
  dispatchCommand error path is covered

Author: lykinsbd

cissh_test.go

@@ -66,6 +66,22 @@ platforms:
 	}
 }
 
+func TestRun_InventoryZeroCounts(t *testing.T) {
+	inv := `---
+devices:
+  - platform: csr1000v
+    count: 0
+`
+	invFile := filepath.Join(t.TempDir(), "inventory.yaml")
+	if err := os.WriteFile(invFile, []byte(inv), 0644); err != nil {
+		t.Fatal(err)
+	}
+	cli := utils.CLI{Platform: "csr1000v", TranscriptMap: validTranscriptMap(t), Inventory: invFile}
+	if err := run(context.Background(), cli); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+}
+
 func TestRun_BadInventory(t *testing.T) {
 	cli := utils.CLI{Platform: "csr1000v", TranscriptMap: validTranscriptMap(t), Inventory: "/nonexistent/inventory.yaml"}
 	if err := run(context.Background(), cli); err == nil {

ssh_server/handlers/ciscohandlers_test.go

@@ -321,6 +321,24 @@ func TestHandler_EmptyInput(t *testing.T) {
 	}
 }
 
+func TestHandler_AmbiguousContextCommand(t *testing.T) {
+	fd := newTestDevice()
+	// Add two multi-word context keys sharing a prefix to trigger multiplePromptMatches.
+	// "sh v" matches both "show version" and "show vlan" via field-by-field matching.
+	fd.ContextSearch["show version"] = "(show-version)#"
+	fd.ContextSearch["show vlan"] = "(show-vlan)#"
+	addr, cleanup := startTestServer(t, fd)
+	defer cleanup()
+
+	// multiplePromptMatches=true falls through to dispatchCommand.
+	// "sh v" also matches "show version" in SupportedCommands, so we get output.
+	out := interact(t, addr, []string{"sh v"})
+	// Verify we got command output (not a context switch) — confirms the fallthrough path executed
+	if !strings.Contains(out, "FakeOS") {
+		t.Errorf("expected command output after ambiguous context fallthrough, got:\n%s", out)
+	}
+}
+
 func TestHandler_AmbiguousCommand(t *testing.T) {
 	fd := newTestDevice()
 	// Add commands that will be ambiguous with "s v"