diff --git a/models/spring-ai-google-genai/src/test/java/org/springframework/ai/google/genai/MimeTypeDetectorTests.java b/models/spring-ai-google-genai/src/test/java/org/springframework/ai/google/genai/MimeTypeDetectorTests.java
index 9ce4aeb5d57..6608a281214 100644
--- a/models/spring-ai-google-genai/src/test/java/org/springframework/ai/google/genai/MimeTypeDetectorTests.java
+++ b/models/spring-ai-google-genai/src/test/java/org/springframework/ai/google/genai/MimeTypeDetectorTests.java
@@ -26,11 +26,13 @@
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 
-import org.springframework.ai.google.genai.MimeTypeDetector;
+import org.junit.jupiter.params.provider.ValueSource;
 import org.springframework.core.io.PathResource;
 import org.springframework.util.MimeType;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatCode;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
 import static org.springframework.ai.google.genai.MimeTypeDetector.GEMINI_MIME_TYPES;
 
 /**
@@ -90,4 +92,49 @@ void getMimeTypeByString(String extension, MimeType expectedMimeType) {
 		assertThat(mimeType).isEqualTo(expectedMimeType);
 	}
 
+	@ParameterizedTest
+	@ValueSource(strings = { " ", "\t", "\n" })
+	void getMimeTypeByStringWithInvalidInputShouldThrowException(String invalidPath) {
+		assertThatThrownBy(() -> MimeTypeDetector.getMimeType(invalidPath)).isInstanceOf(IllegalArgumentException.class)
+			.hasMessageContaining("Unable to detect the MIME type");
+	}
+
+	@ParameterizedTest
+	@ValueSource(strings = { "JPG", "PNG", "GIF" })
+	void getMimeTypeByStringWithUppercaseExtensionsShouldWork(String uppercaseExt) {
+		String upperFileName = "test." + uppercaseExt;
+		String lowerFileName = "test." + uppercaseExt.toLowerCase();
+
+		// Should throw for uppercase (not in map) but work for lowercase
+		assertThatThrownBy(() -> MimeTypeDetector.getMimeType(upperFileName))
+			.isInstanceOf(IllegalArgumentException.class);
+
+		// Lowercase should work if it's a supported extension
+		if (GEMINI_MIME_TYPES.containsKey(uppercaseExt.toLowerCase())) {
+			assertThatCode(() -> MimeTypeDetector.getMimeType(lowerFileName)).doesNotThrowAnyException();
+		}
+	}
+
+	@ParameterizedTest
+	@ValueSource(strings = { "test.jpg", "test.png", "test.gif" })
+	void getMimeTypeSupportedFileAcrossDifferentMethodsShouldBeConsistent(String fileName) {
+		MimeType stringResult = MimeTypeDetector.getMimeType(fileName);
+		MimeType fileResult = MimeTypeDetector.getMimeType(new File(fileName));
+		MimeType pathResult = MimeTypeDetector.getMimeType(Path.of(fileName));
+
+		// All methods should return the same result for supported extensions
+		assertThat(stringResult).isEqualTo(fileResult);
+		assertThat(stringResult).isEqualTo(pathResult);
+	}
+
+	@ParameterizedTest
+	@ValueSource(strings = { "https://example.com/documents/file.pdf", "https://example.com/data/file.json",
+			"https://example.com/files/document.txt" })
+	void getMimeTypeByURIWithUnsupportedExtensionsShouldThrowException(String url) {
+		URI uri = URI.create(url);
+
+		assertThatThrownBy(() -> MimeTypeDetector.getMimeType(uri)).isInstanceOf(IllegalArgumentException.class)
+			.hasMessageContaining("Unable to detect the MIME type");
+	}
+
 }
diff --git a/vector-stores/spring-ai-coherence-store/src/test/java/org/springframework/ai/vectorstore/coherence/CoherenceFilterExpressionConverterTests.java b/vector-stores/spring-ai-coherence-store/src/test/java/org/springframework/ai/vectorstore/coherence/CoherenceFilterExpressionConverterTests.java
index b1487f3e2ec..bd0ec23bfd9 100644
--- a/vector-stores/spring-ai-coherence-store/src/test/java/org/springframework/ai/vectorstore/coherence/CoherenceFilterExpressionConverterTests.java
+++ b/vector-stores/spring-ai-coherence-store/src/test/java/org/springframework/ai/vectorstore/coherence/CoherenceFilterExpressionConverterTests.java
@@ -90,4 +90,61 @@ private ValueExtractor extractor(String property) {
 		return new ChainedExtractor(new UniversalExtractor<>("metadata"), new UniversalExtractor<>(property));
 	}
 
+	@Test
+	void testBooleanValues() {
+		final Expression e1 = new FilterExpressionTextParser().parse("active == true");
+		final Expression e2 = new FilterExpressionTextParser().parse("deleted == false");
+
+		assertThat(CONVERTER.convert(e1)).isEqualTo(Filters.equal(extractor("active"), true));
+		assertThat(CONVERTER.convert(e2)).isEqualTo(Filters.equal(extractor("deleted"), false));
+	}
+
+	@Test
+	void testNumericValues() {
+		final Expression intExpr = new FilterExpressionTextParser().parse("count == 42");
+		final Expression doubleExpr = new FilterExpressionTextParser().parse("rating == 4.5");
+		final Expression negativeExpr = new FilterExpressionTextParser().parse("temperature == -10");
+
+		assertThat(CONVERTER.convert(intExpr)).isEqualTo(Filters.equal(extractor("count"), 42));
+		assertThat(CONVERTER.convert(doubleExpr)).isEqualTo(Filters.equal(extractor("rating"), 4.5));
+		assertThat(CONVERTER.convert(negativeExpr)).isEqualTo(Filters.equal(extractor("temperature"), -10));
+	}
+
+	@Test
+	void testStringWithSpecialCharacters() {
+		final Expression e = new FilterExpressionTextParser().parse("description == 'This has \"quotes\" and spaces'");
+		assertThat(CONVERTER.convert(e))
+			.isEqualTo(Filters.equal(extractor("description"), "This has \"quotes\" and spaces"));
+	}
+
+	@Test
+	void testEmptyStringValue() {
+		final Expression e = new FilterExpressionTextParser().parse("comment == ''");
+		assertThat(CONVERTER.convert(e)).isEqualTo(Filters.equal(extractor("comment"), ""));
+	}
+
+	@Test
+	void testINWithMixedTypes() {
+		final Expression e = new FilterExpressionTextParser().parse("status in [1, 'active', true]");
+		assertThat(CONVERTER.convert(e)).isEqualTo(Filters.in(extractor("status"), 1, "active", true));
+	}
+
+	@Test
+	void testINWithSingleValue() {
+		final Expression e = new FilterExpressionTextParser().parse("category in ['category1']");
+		assertThat(CONVERTER.convert(e)).isEqualTo(Filters.in(extractor("category"), "category1"));
+	}
+
+	@Test
+	void testNINWithSingleValue() {
+		final Expression e = new FilterExpressionTextParser().parse("category nin ['inactive']");
+		assertThat(CONVERTER.convert(e)).isEqualTo(Filters.not(Filters.in(extractor("category"), "inactive")));
+	}
+
+	@Test
+	void testCategoryWithNumericComparison() {
+		final Expression e = new FilterExpressionTextParser().parse("categoryId >= 5");
+		assertThat(CONVERTER.convert(e)).isEqualTo(Filters.greaterEqual(extractor("categoryId"), 5));
+	}
+
 }