diff --git a/app/core/src/test/java/stirling/software/SPDF/Factories/ReplaceAndInvertColorFactoryTest.java b/app/core/src/test/java/stirling/software/SPDF/Factories/ReplaceAndInvertColorFactoryTest.java
new file mode 100644
index 000000000..5285091c9
--- /dev/null
+++ b/app/core/src/test/java/stirling/software/SPDF/Factories/ReplaceAndInvertColorFactoryTest.java
@@ -0,0 +1,74 @@
+package stirling.software.SPDF.Factories;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.mock;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.web.multipart.MultipartFile;
+
+import stirling.software.common.model.api.misc.HighContrastColorCombination;
+import stirling.software.common.model.api.misc.ReplaceAndInvert;
+import stirling.software.common.util.misc.CustomColorReplaceStrategy;
+import stirling.software.common.util.misc.InvertFullColorStrategy;
+import stirling.software.common.util.misc.ReplaceAndInvertColorStrategy;
+
+class ReplaceAndInvertColorFactoryTest {
+
+    private ReplaceAndInvertColorFactory factory;
+    private MultipartFile file;
+
+    @BeforeEach
+    void setup() {
+        factory = new ReplaceAndInvertColorFactory();
+        file = mock(MultipartFile.class);
+    }
+
+    @Test
+    void whenCustomColor_thenReturnsCustomColorReplaceStrategy() {
+        ReplaceAndInvert option = ReplaceAndInvert.CUSTOM_COLOR;
+        HighContrastColorCombination combo = null; // not used for CUSTOM_COLOR
+
+        ReplaceAndInvertColorStrategy strategy =
+                factory.replaceAndInvert(file, option, combo, "#FFFFFF", "#000000");
+
+        assertNotNull(strategy);
+        assertTrue(
+                strategy instanceof CustomColorReplaceStrategy,
+                "Expected CustomColorReplaceStrategy for CUSTOM_COLOR");
+    }
+
+    @Test
+    void whenHighContrastColor_thenReturnsCustomColorReplaceStrategy() {
+        ReplaceAndInvert option = ReplaceAndInvert.HIGH_CONTRAST_COLOR;
+        HighContrastColorCombination combo = null;
+
+        ReplaceAndInvertColorStrategy strategy =
+                factory.replaceAndInvert(file, option, combo, "#FFFFFF", "#000000");
+
+        assertNotNull(strategy);
+        assertTrue(
+                strategy instanceof CustomColorReplaceStrategy,
+                "Expected CustomColorReplaceStrategy for HIGH_CONTRAST_COLOR");
+    }
+
+    @Test
+    void whenFullInversion_thenReturnsInvertFullColorStrategy() {
+        ReplaceAndInvert option = ReplaceAndInvert.FULL_INVERSION;
+
+        ReplaceAndInvertColorStrategy strategy =
+                factory.replaceAndInvert(file, option, null, null, null);
+
+        assertNotNull(strategy);
+        assertTrue(
+                strategy instanceof InvertFullColorStrategy,
+                "Expected InvertFullColorStrategy for FULL_INVERSION");
+    }
+
+    @Test
+    void whenNullOption_thenReturnsNull() {
+        ReplaceAndInvertColorStrategy strategy =
+                factory.replaceAndInvert(file, null, null, null, null);
+        assertNull(strategy, "Expected null for unsupported/unknown option");
+    }
+}