Convert CameraFactory unit test to gtest and remove legacy truth test (#5911)

Co-authored-by: AstroKEW78 <29870969+AstroKEW78@users.noreply.github.com>

Author: AstroKEW78

isis/src/base/objs/CameraFactory/CameraFactory.truth

@@ -0,0 +1,89 @@
+#include "gmock/gmock.h"
+
+#include <functional>
+
+#include "CameraFactory.h"
+#include "IException.h"
+#include "Preference.h"
+#include "Pvl.h"
+#include "PvlGroup.h"
+#include "PvlKeyword.h"
+
+using namespace Isis;
+
+// Stable substrings taken from CameraFactory.cpp
+//   - CameraVersion(Pvl&) outer catch
+static const QString CAMERA_VERSION_ERROR =
+    "Unable to locate latest camera model version number from group [Instrument]";
+
+class CameraFactoryTests : public ::testing::Test {
+protected:
+  static void SetUpTestSuite() {
+    // Standard ISIS test setup
+    Preference::Preferences(true);
+  }
+
+  // Helper: ensure an IException is thrown and its message contains substring
+  void expectIExceptionContaining(std::function<void()> fn,
+                                  const QString &expectedSubstring) {
+    try {
+      fn();
+      FAIL() << "Expected an IException to be thrown";
+    }
+    catch (IException &e) {
+      QString msg = e.toString();
+      EXPECT_TRUE(msg.contains(expectedSubstring))
+          << "Expected exception message to contain:\n  ["
+          << expectedSubstring.toStdString()
+          << "]\nBut actual message was:\n  ["
+          << msg.toStdString() << "]";
+    }
+    catch (...) {
+      FAIL() << "Expected an IException, but a different exception type was thrown";
+    }
+  }
+};
+
+
+// 1) No Instrument group at all
+TEST_F(CameraFactoryTests, MissingInstrumentGroup) {
+  Pvl lab;  // empty: no Instrument
+
+  expectIExceptionContaining(
+      [&lab]() {
+        (void) CameraFactory::CameraVersion(lab);
+      },
+      CAMERA_VERSION_ERROR);
+}
+
+
+// 2) Instrument group present, but missing SpacecraftName keyword
+TEST_F(CameraFactoryTests, MissingSpacecraftName) {
+  Pvl lab;
+  PvlGroup inst("Instrument");
+  // No SpacecraftName, no InstrumentId yet
+  lab.addGroup(inst);
+
+  expectIExceptionContaining(
+      [&lab]() {
+        (void) CameraFactory::CameraVersion(lab);
+      },
+      CAMERA_VERSION_ERROR);
+}
+
+
+// 3) Instrument group has bogus spacecraft/instrument; plugin cannot find a match
+TEST_F(CameraFactoryTests, UnsupportedCameraModel) {
+  Pvl lab;
+  PvlGroup inst("Instrument");
+  inst += PvlKeyword("SpacecraftName", "Bogus Spacecraft");
+  inst += PvlKeyword("InstrumentId", "Bogus Instrument");
+  lab.addGroup(inst);
+
+  // CameraVersion will fail when trying to find a matching plugin group
+  expectIExceptionContaining(
+      [&lab]() {
+        (void) CameraFactory::CameraVersion(lab);
+      },
+      CAMERA_VERSION_ERROR);
+}