diff --git a/tests/TarninaHub.Tests/Application/EmbeddingAndStageTests.cs b/tests/TarninaHub.Tests/Application/EmbeddingAndStageTests.cs
new file mode 100644
index 0000000..b81272b
--- /dev/null
+++ b/tests/TarninaHub.Tests/Application/EmbeddingAndStageTests.cs
@@ -0,0 +1,47 @@
+using TarninaHub.Application.Mappings;
+using TarninaHub.Application.Text;
+using TarninaHub.Domain.Enums;
+
+namespace TarninaHub.Tests.Application;
+
+public class EmbeddingAndStageTests
+{
+    [Fact]
+    public void EmbeddingTextBuilder_JoinsNonEmptyParts()
+    {
+        var text = EmbeddingTextBuilder.Build("Tytuł", "Streszczenie", null, "Seniorzy");
+
+        Assert.Equal("Tytuł\nStreszczenie\nSeniorzy", text);
+    }
+
+    [Fact]
+    public void EmbeddingTextBuilder_TrimsAndSkipsBlank()
+    {
+        var text = EmbeddingTextBuilder.Build("  Tytuł  ", "   ", "Opis", null);
+
+        Assert.Equal("Tytuł\nOpis", text);
+    }
+
+    [Theory]
+    [InlineData("idea", true)]
+    [InlineData("pilot", true)]
+    [InlineData("scaling", true)]
+    [InlineData("service", true)]
+    [InlineData("draft", false)]
+    [InlineData("", false)]
+    public void InnovationStageWire_Validates(string value, bool expected)
+    {
+        Assert.Equal(expected, InnovationStageWire.IsValid(value));
+    }
+
+    [Theory]
+    [InlineData(InnovationStage.Idea, "idea")]
+    [InlineData(InnovationStage.Pilot, "pilot")]
+    [InlineData(InnovationStage.Scaling, "scaling")]
+    [InlineData(InnovationStage.Service, "service")]
+    public void InnovationStageWire_RoundTrips(InnovationStage stage, string wire)
+    {
+        Assert.Equal(wire, stage.ToWire());
+        Assert.Equal(stage, InnovationStageWire.Parse(wire));
+    }
+}
diff --git a/tests/TarninaHub.Tests/Controllers/InnovationsControllerTests.cs b/tests/TarninaHub.Tests/Controllers/InnovationsControllerTests.cs
new file mode 100644
index 0000000..855201f
--- /dev/null
+++ b/tests/TarninaHub.Tests/Controllers/InnovationsControllerTests.cs
@@ -0,0 +1,90 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using TarninaHub.Application.Abstractions;
+using TarninaHub.Application.Dtos;
+using TarninaHub.Controllers;
+
+namespace TarninaHub.Tests.Controllers;
+
+public class InnovationsControllerTests
+{
+    private static InnovationsController CreateController(IInnovationService service)
+    {
+        var controller = new InnovationsController(service);
+        var identity = new ClaimsIdentity(
+            [new Claim("sub", "user:tester"), new Claim("role", "admin")],
+            authenticationType: "test");
+
+        controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal(identity) },
+        };
+
+        return controller;
+    }
+
+    private static InnovationRequest SampleRequest(string stage) => new(
+        "Klub sąsiedzki",
+        "Streszczenie",
+        "Opis",
+        "social_challenge:seniorzy",
+        stage,
+        null,
+        null,
+        null,
+        true);
+
+    [Fact]
+    public async Task Create_RejectsUnknownStage()
+    {
+        var controller = CreateController(new StubInnovationService());
+
+        var result = await controller.Create(SampleRequest("draft"), CancellationToken.None);
+
+        Assert.IsType<ObjectResult>(result.Result);
+    }
+
+    [Fact]
+    public async Task Create_AcceptsKnownStage()
+    {
+        var controller = CreateController(new StubInnovationService());
+
+        var result = await controller.Create(SampleRequest("pilot"), CancellationToken.None);
+
+        Assert.IsType<CreatedAtActionResult>(result.Result);
+    }
+
+    private sealed class StubInnovationService : IInnovationService
+    {
+        public Task<IReadOnlyList<InnovationResponse>> ListAsync(
+            string? challengeId,
+            string? stage,
+            string? query,
+            bool onlyPublished,
+            CancellationToken cancellationToken) => Task.FromResult<IReadOnlyList<InnovationResponse>>([]);
+
+        public Task<InnovationResponse?> GetAsync(string innovationId, CancellationToken cancellationToken) =>
+            Task.FromResult<InnovationResponse?>(null);
+
+        public Task<InnovationResponse> CreateAsync(
+            InnovationRequest request,
+            CancellationToken cancellationToken) => Task.FromResult(new InnovationResponse(
+                "innovation:new",
+                request.Title,
+                request.Summary ?? string.Empty,
+                request.Description ?? string.Empty,
+                request.ChallengeId,
+                request.Stage,
+                request.Cost,
+                request.Contact,
+                request.Media ?? [],
+                request.Published,
+                DateTimeOffset.UtcNow));
+
+        public Task<InnovationResponse?> UpdateAsync(
+            string innovationId,
+            InnovationRequest request,
+            CancellationToken cancellationToken) => Task.FromResult<InnovationResponse?>(null);
+    }
+}