diff --git a/impeller/entity/BUILD.gn b/impeller/entity/BUILD.gn
index 4e1ce88280d4a..45f533e76a955 100644
--- a/impeller/entity/BUILD.gn
+++ b/impeller/entity/BUILD.gn
@@ -240,6 +240,7 @@ impeller_component("entity_unittests") {
   testonly = true
 
   sources = [
+    "contents/filters/directional_gaussian_blur_filter_contents_unittests.cc",
     "contents/filters/inputs/filter_input_unittests.cc",
     "entity_playground.cc",
     "entity_playground.h",
diff --git a/impeller/entity/contents/filters/directional_gaussian_blur_filter_contents_unittests.cc b/impeller/entity/contents/filters/directional_gaussian_blur_filter_contents_unittests.cc
new file mode 100644
index 0000000000000..a2c8df040c8d5
--- /dev/null
+++ b/impeller/entity/contents/filters/directional_gaussian_blur_filter_contents_unittests.cc
@@ -0,0 +1,166 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "flutter/testing/testing.h"
+#include "gmock/gmock.h"
+#include "impeller/entity/contents/content_context.h"
+#include "impeller/entity/contents/filters/directional_gaussian_blur_filter_contents.h"
+#include "impeller/renderer/testing/mocks.h"
+
+namespace impeller {
+namespace testing {
+
+using ::testing::_;
+using ::testing::An;
+using ::testing::Invoke;
+using ::testing::Return;
+using ::testing::ReturnRef;
+
+namespace {
+
+Scalar CalculateSigmaForBlurRadius(Scalar blur_radius) {
+  // See Sigma.h
+  return (blur_radius / kKernelRadiusPerSigma) + 0.5;
+}
+}  // namespace
+
+class DirectionalGaussianBlurFilterContentsTest : public ::testing::Test {
+ public:
+  void SetUp() override { capabilities_ = mock_capabilities_; }
+
+  std::shared_ptr<MockCapabilities> mock_capabilities_ =
+      std::make_shared<MockCapabilities>();
+  std::shared_ptr<const Capabilities> capabilities_;
+};
+
+TEST_F(DirectionalGaussianBlurFilterContentsTest, CoverageWithEffectTransform) {
+  TextureDescriptor desc = {
+      .size = ISize(100, 100),
+  };
+  Scalar sigma_radius_1 = CalculateSigmaForBlurRadius(1.0);
+  auto contents = std::make_unique<DirectionalGaussianBlurFilterContents>();
+  contents->SetSigma(Sigma{sigma_radius_1});
+  contents->SetDirection({1.0, 0.0});
+  std::shared_ptr<MockTexture> texture = std::make_shared<MockTexture>(desc);
+  EXPECT_CALL(*texture, GetSize()).WillRepeatedly(Return(ISize(100, 100)));
+  FilterInput::Vector inputs = {FilterInput::Make(texture)};
+  Entity entity;
+  entity.SetTransformation(Matrix::MakeTranslation({100, 100, 0}));
+  std::optional<Rect> coverage = contents->GetFilterCoverage(
+      inputs, entity, /*effect_transform=*/Matrix::MakeScale({2.0, 2.0, 1.0}));
+  ASSERT_EQ(coverage, Rect::MakeLTRB(100 - 2, 100, 200 + 2, 200));
+}
+
+TEST_F(DirectionalGaussianBlurFilterContentsTest, FilterSourceCoverage) {
+  Scalar sigma_radius_1 = CalculateSigmaForBlurRadius(1.0);
+  auto contents = std::make_unique<DirectionalGaussianBlurFilterContents>();
+  contents->SetSigma(Sigma{sigma_radius_1});
+  contents->SetDirection({1.0, 0.0});
+  std::optional<Rect> coverage = contents->GetFilterSourceCoverage(
+      /*effect_transform=*/Matrix::MakeScale({2.0, 2.0, 1.0}),
+      /*output_limit=*/Rect::MakeLTRB(100, 100, 200, 200));
+  ASSERT_EQ(coverage, Rect::MakeLTRB(100 - 2, 100, 200 + 2, 200));
+}
+
+TEST_F(DirectionalGaussianBlurFilterContentsTest, RenderNoCoverage) {
+  Scalar sigma_radius_1 = CalculateSigmaForBlurRadius(1.0);
+  auto contents = std::make_unique<DirectionalGaussianBlurFilterContents>();
+  contents->SetSigma(Sigma{sigma_radius_1});
+  contents->SetDirection({1.0, 0.0});
+  auto mock_context = std::make_shared<MockImpellerContext>();
+  auto mock_typographer_context = std::make_shared<MockTypographerContext>();
+  auto mock_allocator = std::make_shared<MockAllocator>();
+  auto mock_render_target_allocator =
+      std::make_shared<MockRenderTargetAllocator>(mock_allocator);
+  ContentContext renderer(mock_context, mock_typographer_context,
+                          mock_render_target_allocator);
+  Entity entity;
+  Rect coverage_hint = Rect::MakeLTRB(0, 0, 0, 0);
+  std::optional<Entity> result =
+      contents->GetEntity(renderer, entity, coverage_hint);
+  ASSERT_FALSE(result.has_value());
+}
+
+TEST_F(DirectionalGaussianBlurFilterContentsTest, RenderSomething) {
+  TextureDescriptor desc = {
+      .size = ISize(100, 100),
+  };
+  std::shared_ptr<MockTexture> texture = std::make_shared<MockTexture>(desc);
+  EXPECT_CALL(*texture, GetSize()).WillRepeatedly(Return(ISize(100, 100)));
+  Scalar sigma_radius_1 = CalculateSigmaForBlurRadius(1.0);
+  auto contents = std::make_unique<DirectionalGaussianBlurFilterContents>();
+  contents->SetSigma(Sigma{sigma_radius_1});
+  contents->SetDirection({1.0, 0.0});
+  contents->SetInputs({FilterInput::Make(texture)});
+  auto mock_context = std::make_shared<MockImpellerContext>();
+  EXPECT_CALL(*mock_context, GetCapabilities())
+      .WillRepeatedly(ReturnRef(capabilities_));
+  EXPECT_CALL(*mock_context, IsValid()).WillRepeatedly(Return(true));
+  auto mock_sampler_library = std::make_shared<MockSamplerLibrary>();
+  auto mock_shader_library = std::make_shared<MockShaderLibrary>();
+  auto mock_pipeline_library = std::make_shared<MockPipelineLibrary>();
+  EXPECT_CALL(*mock_pipeline_library, GetPipeline(An<PipelineDescriptor>()))
+      .WillRepeatedly(
+          Invoke([&mock_pipeline_library](PipelineDescriptor descriptor) {
+            PipelineFuture<PipelineDescriptor> result;
+            std::promise<std::shared_ptr<Pipeline<PipelineDescriptor>>> promise;
+            auto mock_pipeline =
+                std::make_shared<MockPipeline<PipelineDescriptor>>(
+                    mock_pipeline_library, descriptor);
+            EXPECT_CALL(*mock_pipeline, IsValid()).WillRepeatedly(Return(true));
+            promise.set_value(mock_pipeline);
+            result.descriptor = descriptor;
+            result.future = promise.get_future();
+            return result;
+          }));
+  EXPECT_CALL(*mock_shader_library, GetFunction(_, _))
+      .WillRepeatedly(Invoke([](std::string_view name, ShaderStage stage) {
+        return std::make_shared<MockShaderFunction>(UniqueID(),
+                                                    std::string(name), stage);
+      }));
+  EXPECT_CALL(*mock_context, GetSamplerLibrary())
+      .WillRepeatedly(Return(mock_sampler_library));
+  EXPECT_CALL(*mock_context, GetShaderLibrary())
+      .WillRepeatedly(Return(mock_shader_library));
+  EXPECT_CALL(*mock_context, GetPipelineLibrary())
+      .WillRepeatedly(Return(mock_pipeline_library));
+  EXPECT_CALL(*mock_context, CreateCommandBuffer())
+      .WillRepeatedly(Invoke(([&mock_context]() {
+        auto result = std::make_shared<MockCommandBuffer>(mock_context);
+        EXPECT_CALL(*result, IsValid()).WillRepeatedly(Return(true));
+        EXPECT_CALL(*result, OnSubmitCommands(_)).WillRepeatedly(Return(true));
+        EXPECT_CALL(*result, OnCreateRenderPass(_))
+            .WillRepeatedly(
+                Invoke(([&mock_context](const RenderTarget& render_target) {
+                  auto result = std::make_shared<MockRenderPass>(mock_context,
+                                                                 render_target);
+                  EXPECT_CALL(*result, IsValid).WillRepeatedly(Return(true));
+                  EXPECT_CALL(*result, OnEncodeCommands(_))
+                      .WillRepeatedly(Return(true));
+                  return result;
+                })));
+        return result;
+      })));
+  auto mock_typographer_context = std::make_shared<MockTypographerContext>();
+  auto mock_allocator = std::make_shared<MockAllocator>();
+  auto mock_render_target_allocator =
+      std::make_shared<MockRenderTargetAllocator>(mock_allocator);
+  EXPECT_CALL(*mock_render_target_allocator, CreateTexture(_))
+      .WillRepeatedly(Invoke(([](const TextureDescriptor& desc) {
+        auto result = std::make_shared<MockTexture>(desc);
+        EXPECT_CALL(*result, IsValid()).WillRepeatedly(Return(true));
+        return result;
+      })));
+  ContentContext renderer(mock_context, mock_typographer_context,
+                          mock_render_target_allocator);
+  Entity entity;
+  Rect coverage_hint = Rect::MakeLTRB(0, 0, 0, 0);
+  std::optional<Entity> result =
+      contents->GetEntity(renderer, entity, coverage_hint);
+  ASSERT_TRUE(result.has_value());
+  ASSERT_EQ(result.value().GetBlendMode(), BlendMode::kSourceOver);
+}
+
+}  // namespace testing
+}  // namespace impeller
diff --git a/impeller/renderer/testing/mocks.h b/impeller/renderer/testing/mocks.h
index 8d50ac115c27b..15c8ae8ef86e4 100644
--- a/impeller/renderer/testing/mocks.h
+++ b/impeller/renderer/testing/mocks.h
@@ -9,7 +9,12 @@
 #include "impeller/core/texture.h"
 #include "impeller/renderer/command_buffer.h"
 #include "impeller/renderer/context.h"
+#include "impeller/renderer/pipeline_library.h"
+#include "impeller/renderer/render_pass.h"
 #include "impeller/renderer/render_target.h"
+#include "impeller/renderer/sampler_library.h"
+#include "impeller/renderer/shader_function.h"
+#include "impeller/typographer/typographer_context.h"
 
 namespace impeller {
 namespace testing {
@@ -164,5 +169,113 @@ class MockTexture : public Texture {
               (override));
 };
 
+class MockTypographerContext : public TypographerContext {
+ public:
+  MOCK_METHOD(std::shared_ptr<GlyphAtlas>,
+              CreateGlyphAtlas,
+              (Context & context,
+               GlyphAtlas::Type type,
+               std::shared_ptr<GlyphAtlasContext> atlas_context,
+               const FontGlyphMap& font_glyph_map),
+              (const, override));
+  MOCK_METHOD(std::shared_ptr<GlyphAtlasContext>,
+              CreateGlyphAtlasContext,
+              (),
+              (const, override));
+};
+
+class MockRenderTargetAllocator : public RenderTargetAllocator {
+ public:
+  MockRenderTargetAllocator(std::shared_ptr<Allocator> allocator)
+      : RenderTargetAllocator(allocator) {}
+  MOCK_METHOD(std::shared_ptr<Texture>,
+              CreateTexture,
+              (const TextureDescriptor& desc),
+              (override));
+};
+
+class MockCapabilities : public Capabilities {
+ public:
+  MOCK_METHOD(bool, SupportsOffscreenMSAA, (), (const, override));
+  MOCK_METHOD(bool, SupportsImplicitResolvingMSAA, (), (const, override));
+  MOCK_METHOD(bool, SupportsSSBO, (), (const, override));
+  MOCK_METHOD(bool, SupportsBufferToTextureBlits, (), (const, override));
+  MOCK_METHOD(bool, SupportsTextureToTextureBlits, (), (const, override));
+  MOCK_METHOD(bool, SupportsFramebufferFetch, (), (const, override));
+  MOCK_METHOD(bool, SupportsCompute, (), (const, override));
+  MOCK_METHOD(bool, SupportsComputeSubgroups, (), (const, override));
+  MOCK_METHOD(bool, SupportsReadFromOnscreenTexture, (), (const, override));
+  MOCK_METHOD(bool, SupportsReadFromResolve, (), (const, override));
+  MOCK_METHOD(bool, SupportsDecalSamplerAddressMode, (), (const, override));
+  MOCK_METHOD(bool, SupportsDeviceTransientTextures, (), (const, override));
+  MOCK_METHOD(PixelFormat, GetDefaultColorFormat, (), (const, override));
+  MOCK_METHOD(PixelFormat, GetDefaultStencilFormat, (), (const, override));
+  MOCK_METHOD(PixelFormat, GetDefaultDepthStencilFormat, (), (const, override));
+};
+
+class MockRenderPass : public RenderPass {
+ public:
+  MockRenderPass(std::weak_ptr<const Context> context,
+                 const RenderTarget& target)
+      : RenderPass(context, target) {}
+  MOCK_METHOD(bool, IsValid, (), (const, override));
+  MOCK_METHOD(void, OnSetLabel, (std::string), (override));
+  MOCK_METHOD(bool, OnEncodeCommands, (const Context&), (const, override));
+};
+
+class MockSamplerLibrary : public SamplerLibrary {
+ public:
+  MOCK_METHOD(std::shared_ptr<const Sampler>,
+              GetSampler,
+              (SamplerDescriptor),
+              (override));
+};
+
+class MockShaderLibrary : public ShaderLibrary {
+ public:
+  MOCK_METHOD(bool, IsValid, (), (const, override));
+  MOCK_METHOD(std::shared_ptr<const ShaderFunction>,
+              GetFunction,
+              (std::string_view name, ShaderStage stage),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterFunction,
+              (std::string name, ShaderStage stage),
+              (override));
+};
+
+class MockShaderFunction : public ShaderFunction {
+ public:
+  MockShaderFunction(UniqueID parent_library_id,
+                     std::string name,
+                     ShaderStage stage)
+      : ShaderFunction(parent_library_id, name, stage) {}
+};
+
+class MockPipelineLibrary : public PipelineLibrary {
+ public:
+  MOCK_METHOD(bool, IsValid, (), (const, override));
+  MOCK_METHOD(PipelineFuture<PipelineDescriptor>,
+              GetPipeline,
+              (PipelineDescriptor descriptor),
+              (override));
+  MOCK_METHOD(PipelineFuture<ComputePipelineDescriptor>,
+              GetPipeline,
+              (ComputePipelineDescriptor descriptor),
+              (override));
+  MOCK_METHOD(void,
+              RemovePipelinesWithEntryPoint,
+              (std::shared_ptr<const ShaderFunction> function),
+              (override));
+};
+
+template <typename T>
+class MockPipeline : public Pipeline<T> {
+ public:
+  MockPipeline(std::weak_ptr<PipelineLibrary> library, T desc)
+      : Pipeline<T>(library, desc) {}
+  MOCK_METHOD(bool, IsValid, (), (const, override));
+};
+
 }  // namespace testing
 }  // namespace impeller