diff --git a/providers/flagd/src/provider.cpp b/providers/flagd/src/provider.cpp
index 05dd084..3b9963b 100644
--- a/providers/flagd/src/provider.cpp
+++ b/providers/flagd/src/provider.cpp
@@ -27,6 +27,21 @@ FlagdProvider::FlagdProvider(FlagdProviderConfig config)
   evaluator_ = std::make_unique<JsonLogicEvaluator>(sync_);
 }
 
+FlagdProvider::FlagdProvider(std::shared_ptr<FlagSync> sync,
+                             FlagdProviderConfig config)
+    : configuration_(std::move(config)),
+      sync_(std::move(sync)),
+      evaluator_(std::make_unique<JsonLogicEvaluator>(sync_)),
+      is_ready_(false) {}
+
+FlagdProvider::FlagdProvider(std::shared_ptr<FlagSync> sync,
+                             std::unique_ptr<Evaluator> evaluator,
+                             FlagdProviderConfig config)
+    : configuration_(std::move(config)),
+      sync_(std::move(sync)),
+      evaluator_(std::move(evaluator)),
+      is_ready_(false) {}
+
 FlagdProvider::~FlagdProvider() {
   if (is_ready_) {
     absl::Status status = FlagdProvider::Shutdown();
diff --git a/providers/flagd/src/provider.h b/providers/flagd/src/provider.h
index 63b2579..7c85b9e 100644
--- a/providers/flagd/src/provider.h
+++ b/providers/flagd/src/provider.h
@@ -16,6 +16,11 @@ namespace flagd {
 class FlagdProvider : public openfeature::FeatureProvider {
  public:
   explicit FlagdProvider(FlagdProviderConfig config = FlagdProviderConfig());
+  explicit FlagdProvider(std::shared_ptr<FlagSync> sync,
+                         FlagdProviderConfig config = FlagdProviderConfig());
+  FlagdProvider(std::shared_ptr<FlagSync> sync,
+                std::unique_ptr<Evaluator> evaluator,
+                FlagdProviderConfig config = FlagdProviderConfig());
 
   ~FlagdProvider() override;
 
diff --git a/providers/flagd/tests/BUILD b/providers/flagd/tests/BUILD
new file mode 100644
index 0000000..5c76289
--- /dev/null
+++ b/providers/flagd/tests/BUILD
@@ -0,0 +1,10 @@
+load("@rules_cc//cc:defs.bzl", "cc_test")
+
+cc_test(
+    name = "provider_test",
+    srcs = ["provider_test.cpp"],
+    deps = [
+        "//providers/flagd/src:flagd_provider",
+        "@googletest//:gtest_main",
+    ],
+)
diff --git a/providers/flagd/tests/evaluator/BUILD b/providers/flagd/tests/evaluator/BUILD
index 2400ae7..6f2ae7a 100644
--- a/providers/flagd/tests/evaluator/BUILD
+++ b/providers/flagd/tests/evaluator/BUILD
@@ -5,7 +5,7 @@ cc_test(
     srcs = ["evaluator_test.cpp"],
     deps = [
         "//providers/flagd/src/evaluator",
-        "//providers/flagd/src/sync:sync",
+        "//providers/flagd/src/sync",
         "@googletest//:gtest_main",
         "@nlohmann_json//:json",
     ],
diff --git a/providers/flagd/tests/provider_test.cpp b/providers/flagd/tests/provider_test.cpp
new file mode 100644
index 0000000..f99f19c
--- /dev/null
+++ b/providers/flagd/tests/provider_test.cpp
@@ -0,0 +1,150 @@
+#include "flagd/provider.h"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <memory>
+
+#include "flagd/evaluator/evaluator.h"
+#include "flagd/sync/sync.h"
+
+namespace flagd {
+
+class MockSync : public FlagSync {
+ public:
+  MOCK_METHOD(absl::Status, Init, (const openfeature::EvaluationContext& ctx),
+              (override));
+  MOCK_METHOD(absl::Status, Shutdown, (), (override));
+};
+
+class MockEvaluator : public Evaluator {
+ public:
+  MOCK_METHOD(std::unique_ptr<openfeature::BoolResolutionDetails>,
+              ResolveBoolean,
+              (std::string_view flag_key, bool default_value,
+               const openfeature::EvaluationContext& ctx),
+              (override));
+  MOCK_METHOD(std::unique_ptr<openfeature::StringResolutionDetails>,
+              ResolveString,
+              (std::string_view flag_key, std::string_view default_value,
+               const openfeature::EvaluationContext& ctx),
+              (override));
+  MOCK_METHOD(std::unique_ptr<openfeature::IntResolutionDetails>,
+              ResolveInteger,
+              (std::string_view flag_key, int64_t default_value,
+               const openfeature::EvaluationContext& ctx),
+              (override));
+  MOCK_METHOD(std::unique_ptr<openfeature::DoubleResolutionDetails>,
+              ResolveDouble,
+              (std::string_view flag_key, double default_value,
+               const openfeature::EvaluationContext& ctx),
+              (override));
+  MOCK_METHOD(std::unique_ptr<openfeature::ObjectResolutionDetails>,
+              ResolveObject,
+              (std::string_view flag_key, openfeature::Value default_value,
+               const openfeature::EvaluationContext& ctx),
+              (override));
+};
+
+TEST(ProviderTest, MetadataReturnsExpectedValues) {
+  FlagdProvider provider;
+  openfeature::Metadata metadata = provider.GetMetadata();
+  EXPECT_EQ(metadata.name, "flagd");
+}
+
+TEST(ProviderTest, ReturnsNotReadyBeforeInit) {
+  auto mock_sync = std::make_shared<MockSync>();
+  auto mock_evaluator = std::make_unique<MockEvaluator>();
+
+  // We don't expect any calls to the evaluator when not ready
+  EXPECT_CALL(*mock_evaluator, ResolveBoolean).Times(0);
+
+  FlagdProvider provider(mock_sync, std::move(mock_evaluator));
+
+  std::unique_ptr<openfeature::BoolResolutionDetails> result =
+      provider.GetBooleanEvaluation(
+          "some-flag", false,
+          openfeature::EvaluationContext::Builder().build());
+
+  EXPECT_EQ(result->GetErrorCode(), openfeature::ErrorCode::kProviderNotReady);
+  EXPECT_EQ(result->GetReason(), openfeature::Reason::kError);
+}
+
+TEST(ProviderTest, ReturnsReadyAfterInit) {
+  auto mock_sync = std::make_shared<MockSync>();
+  auto mock_evaluator = std::make_unique<MockEvaluator>();
+
+  EXPECT_CALL(*mock_sync, Init).WillOnce(testing::Return(absl::OkStatus()));
+
+  EXPECT_CALL(*mock_evaluator, ResolveBoolean)
+      .WillOnce([](std::string_view flag_key, bool default_value,
+                   const openfeature::EvaluationContext& ctx) {
+        return std::make_unique<openfeature::BoolResolutionDetails>(
+            true, openfeature::Reason::kStatic, "on",
+            openfeature::FlagMetadata());
+      });
+
+  FlagdProvider provider(mock_sync, std::move(mock_evaluator));
+  (void)provider.Init(openfeature::EvaluationContext::Builder().build());
+
+  std::unique_ptr<openfeature::BoolResolutionDetails> result =
+      provider.GetBooleanEvaluation(
+          "some-flag", false,
+          openfeature::EvaluationContext::Builder().build());
+
+  EXPECT_EQ(result->GetValue(), true);
+  EXPECT_EQ(result->GetReason(), openfeature::Reason::kStatic);
+}
+
+TEST(ProviderTest, DelegationWorks) {
+  auto mock_sync = std::make_shared<MockSync>();
+  auto mock_evaluator = std::make_unique<MockEvaluator>();
+
+  EXPECT_CALL(*mock_sync, Init).WillOnce(testing::Return(absl::OkStatus()));
+
+  std::string expected_flag = "my-flag";
+  bool expected_default = true;
+
+  EXPECT_CALL(*mock_evaluator,
+              ResolveBoolean(testing::Eq(expected_flag),
+                             testing::Eq(expected_default), testing::_))
+      .WillOnce([](std::string_view flag_key, bool default_value,
+                   const openfeature::EvaluationContext& ctx) {
+        return std::make_unique<openfeature::BoolResolutionDetails>(
+            default_value, openfeature::Reason::kDefault, std::nullopt,
+            openfeature::FlagMetadata());
+      });
+
+  FlagdProvider provider(mock_sync, std::move(mock_evaluator));
+  (void)provider.Init(openfeature::EvaluationContext::Builder().build());
+
+  std::unique_ptr<openfeature::BoolResolutionDetails> result =
+      provider.GetBooleanEvaluation(
+          expected_flag, expected_default,
+          openfeature::EvaluationContext::Builder().build());
+
+  EXPECT_EQ(result->GetValue(), expected_default);
+  EXPECT_EQ(result->GetReason(), openfeature::Reason::kDefault);
+}
+
+TEST(ProviderTest, ShutdownMakesProviderNotReady) {
+  auto mock_sync = std::make_shared<MockSync>();
+  auto mock_evaluator = std::make_unique<MockEvaluator>();
+
+  EXPECT_CALL(*mock_sync, Init).WillOnce(testing::Return(absl::OkStatus()));
+  EXPECT_CALL(*mock_sync, Shutdown).WillOnce(testing::Return(absl::OkStatus()));
+
+  FlagdProvider provider(mock_sync, std::move(mock_evaluator));
+  (void)provider.Init(openfeature::EvaluationContext::Builder().build());
+  (void)provider.Shutdown();
+
+  std::unique_ptr<openfeature::BoolResolutionDetails> result =
+      provider.GetBooleanEvaluation(
+          "some-flag", false,
+          openfeature::EvaluationContext::Builder().build());
+
+  EXPECT_EQ(result->GetErrorCode(), openfeature::ErrorCode::kProviderNotReady);
+  EXPECT_EQ(result->GetReason(), openfeature::Reason::kError);
+}
+
+}  // namespace flagd