diff --git a/tests/SIGCM2.Api.Tests/Usuarios/ResetPasswordEndpointTests.cs b/tests/SIGCM2.Api.Tests/Usuarios/ResetPasswordEndpointTests.cs
new file mode 100644
index 0000000..6ce411e
--- /dev/null
+++ b/tests/SIGCM2.Api.Tests/Usuarios/ResetPasswordEndpointTests.cs
@@ -0,0 +1,153 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using System.Text.Json;
+using Dapper;
+using Microsoft.Data.SqlClient;
+using SIGCM2.TestSupport;
+
+namespace SIGCM2.Api.Tests.Usuarios;
+
+/// <summary>
+/// Integration tests for POST /api/v1/users/{id}/password/reset (UDT-008 B7).
+/// </summary>
+[Collection("ApiIntegration")]
+public sealed class ResetPasswordEndpointTests : IAsyncLifetime
+{
+    private const string TestConnectionString =
+        "Server=TECNICA3;Database=SIGCM2_Test;User Id=desarrollo;Password=desarrollo2026;TrustServerCertificate=True;";
+
+    private readonly HttpClient _client;
+    private readonly SqlTestFixture _db;
+
+    public ResetPasswordEndpointTests(TestWebAppFactory factory)
+    {
+        _client = factory.CreateClient();
+        _db = new SqlTestFixture(TestConnectionString);
+    }
+
+    public async Task InitializeAsync() => await _db.InitializeAsync();
+    public async Task DisposeAsync() => await _db.DisposeAsync();
+
+    private async Task<string> GetAdminTokenAsync()
+    {
+        var response = await _client.PostAsJsonAsync("/api/v1/auth/login",
+            new { username = "admin", password = "@Diego550@" });
+        response.EnsureSuccessStatusCode();
+        var json = await response.Content.ReadFromJsonAsync<JsonElement>();
+        return json.GetProperty("accessToken").GetString()!;
+    }
+
+    private async Task<int> GetAdminIdAsync()
+    {
+        await using var conn = new SqlConnection(TestConnectionString);
+        await conn.OpenAsync();
+        return await conn.ExecuteScalarAsync<int>("SELECT Id FROM dbo.Usuario WHERE Username = 'admin'");
+    }
+
+    private async Task<int> SeedCajeroAsync(string username)
+    {
+        await using var conn = new SqlConnection(TestConnectionString);
+        await conn.OpenAsync();
+        return await conn.ExecuteScalarAsync<int>($"""
+            IF NOT EXISTS (SELECT 1 FROM dbo.Usuario WHERE Username = '{username}')
+            INSERT INTO dbo.Usuario (Username, PasswordHash, Nombre, Apellido, Rol, PermisosJson, Activo, MustChangePassword)
+            VALUES ('{username}', '$2a$12$rmq6tlSAQ8WXhR2CwLCSeuwCJKz/.8Eab95UQCUNfwe4dokeOqMcW', 'Test', 'User', 'cajero', '[]', 1, 0);
+            SELECT Id FROM dbo.Usuario WHERE Username = '{username}'
+            """);
+    }
+
+    private async Task<string> GetCajeroTokenAsync()
+    {
+        await SeedCajeroAsync("cajero_reset_auth");
+        var response = await _client.PostAsJsonAsync("/api/v1/auth/login",
+            new { username = "cajero_reset_auth", password = "@Diego550@" });
+        response.EnsureSuccessStatusCode();
+        var json = await response.Content.ReadFromJsonAsync<JsonElement>();
+        return json.GetProperty("accessToken").GetString()!;
+    }
+
+    [Fact]
+    public async Task POST_Password_Reset_200_Returns_TempPassword()
+    {
+        var adminToken = await GetAdminTokenAsync();
+        var targetId = await SeedCajeroAsync("cajero_reset_happy");
+
+        var request = new HttpRequestMessage(HttpMethod.Post, $"/api/v1/users/{targetId}/password/reset");
+        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", adminToken);
+
+        var response = await _client.SendAsync(request);
+
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        var json = await response.Content.ReadFromJsonAsync<JsonElement>();
+        Assert.True(json.TryGetProperty("tempPassword", out var tempProp));
+        Assert.False(string.IsNullOrWhiteSpace(tempProp.GetString()));
+    }
+
+    [Fact]
+    public async Task POST_Password_Reset_TempPassword_Length_Gte_12()
+    {
+        var adminToken = await GetAdminTokenAsync();
+        var targetId = await SeedCajeroAsync("cajero_reset_length");
+
+        var request = new HttpRequestMessage(HttpMethod.Post, $"/api/v1/users/{targetId}/password/reset");
+        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", adminToken);
+
+        var response = await _client.SendAsync(request);
+
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        var json = await response.Content.ReadFromJsonAsync<JsonElement>();
+        var tempPassword = json.GetProperty("tempPassword").GetString()!;
+        Assert.True(tempPassword.Length >= 12, $"TempPassword too short: {tempPassword.Length}");
+    }
+
+    [Fact]
+    public async Task POST_Password_Reset_400_Cannot_Self_Reset()
+    {
+        var adminToken = await GetAdminTokenAsync();
+        var adminId = await GetAdminIdAsync();
+
+        var request = new HttpRequestMessage(HttpMethod.Post, $"/api/v1/users/{adminId}/password/reset");
+        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", adminToken);
+
+        var response = await _client.SendAsync(request);
+
+        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+        var body = await response.Content.ReadAsStringAsync();
+        Assert.Contains("cannot-self-reset", body, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public async Task POST_Password_Reset_404_Target_Not_Found()
+    {
+        var adminToken = await GetAdminTokenAsync();
+
+        var request = new HttpRequestMessage(HttpMethod.Post, "/api/v1/users/9999/password/reset");
+        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", adminToken);
+
+        var response = await _client.SendAsync(request);
+
+        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
+    }
+
+    [Fact]
+    public async Task POST_Password_Reset_401_No_Auth()
+    {
+        var response = await _client.SendAsync(new HttpRequestMessage(HttpMethod.Post, "/api/v1/users/1/password/reset"));
+        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
+    }
+
+    [Fact]
+    public async Task POST_Password_Reset_403_No_Permission()
+    {
+        var cajeroToken = await GetCajeroTokenAsync();
+        var targetId = await SeedCajeroAsync("cajero_reset_403_target");
+
+        var request = new HttpRequestMessage(HttpMethod.Post, $"/api/v1/users/{targetId}/password/reset");
+        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", cajeroToken);
+
+        var response = await _client.SendAsync(request);
+
+        Assert.Equal(HttpStatusCode.Forbidden, response.StatusCode);
+    }
+}
diff --git a/tests/SIGCM2.Application.Tests/Common/TempPasswordGeneratorTests.cs b/tests/SIGCM2.Application.Tests/Common/TempPasswordGeneratorTests.cs
new file mode 100644
index 0000000..1f2308d
--- /dev/null
+++ b/tests/SIGCM2.Application.Tests/Common/TempPasswordGeneratorTests.cs
@@ -0,0 +1,82 @@
+using SIGCM2.Application.Common;
+
+namespace SIGCM2.Application.Tests.Common;
+
+public class TempPasswordGeneratorTests
+{
+    [Fact]
+    public void Generate_Default_Length_Is_12()
+    {
+        var pwd = TempPasswordGenerator.Generate();
+        Assert.Equal(12, pwd.Length);
+    }
+
+    [Fact]
+    public void Generate_Always_Has_Uppercase_Letter()
+    {
+        for (int i = 0; i < 20; i++)
+        {
+            var pwd = TempPasswordGenerator.Generate();
+            Assert.True(pwd.Any(char.IsUpper), $"No uppercase found in: {pwd}");
+        }
+    }
+
+    [Fact]
+    public void Generate_Always_Has_Lowercase_Letter()
+    {
+        for (int i = 0; i < 20; i++)
+        {
+            var pwd = TempPasswordGenerator.Generate();
+            Assert.True(pwd.Any(char.IsLower), $"No lowercase found in: {pwd}");
+        }
+    }
+
+    [Fact]
+    public void Generate_Always_Has_Digit()
+    {
+        for (int i = 0; i < 20; i++)
+        {
+            var pwd = TempPasswordGenerator.Generate();
+            Assert.True(pwd.Any(char.IsDigit), $"No digit found in: {pwd}");
+        }
+    }
+
+    [Fact]
+    public void Generate_Always_Has_Special_Char()
+    {
+        const string symbols = "!@#$%&*+-=?";
+        for (int i = 0; i < 20; i++)
+        {
+            var pwd = TempPasswordGenerator.Generate();
+            Assert.True(pwd.Any(c => symbols.Contains(c)), $"No symbol found in: {pwd}");
+        }
+    }
+
+    [Fact]
+    public void Generate_Below_8_Throws_ArgumentOutOfRangeException()
+    {
+        Assert.Throws<ArgumentOutOfRangeException>(() => TempPasswordGenerator.Generate(7));
+    }
+
+    [Fact]
+    public void Generate_100_Samples_All_Pass_Diversity()
+    {
+        const string symbols = "!@#$%&*+-=?";
+        for (int i = 0; i < 100; i++)
+        {
+            var pwd = TempPasswordGenerator.Generate(12);
+            Assert.True(pwd.Length >= 12);
+            Assert.True(pwd.Any(char.IsUpper));
+            Assert.True(pwd.Any(char.IsLower));
+            Assert.True(pwd.Any(char.IsDigit));
+            Assert.True(pwd.Any(c => symbols.Contains(c)));
+        }
+    }
+
+    [Fact]
+    public void Generate_Custom_Length_Respects_Length()
+    {
+        var pwd = TempPasswordGenerator.Generate(16);
+        Assert.Equal(16, pwd.Length);
+    }
+}
diff --git a/tests/SIGCM2.Application.Tests/Usuarios/ResetUsuarioPasswordCommandHandlerTests.cs b/tests/SIGCM2.Application.Tests/Usuarios/ResetUsuarioPasswordCommandHandlerTests.cs
new file mode 100644
index 0000000..d7a92ab
--- /dev/null
+++ b/tests/SIGCM2.Application.Tests/Usuarios/ResetUsuarioPasswordCommandHandlerTests.cs
@@ -0,0 +1,76 @@
+using NSubstitute;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Abstractions.Security;
+using SIGCM2.Application.Usuarios.ResetPassword;
+using SIGCM2.Domain.Entities;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Tests.Usuarios;
+
+public class ResetUsuarioPasswordCommandHandlerTests
+{
+    private readonly IUsuarioRepository _repo = Substitute.For<IUsuarioRepository>();
+    private readonly IPasswordHasher _hasher = Substitute.For<IPasswordHasher>();
+    private readonly IRefreshTokenRepository _refreshRepo = Substitute.For<IRefreshTokenRepository>();
+    private readonly ResetUsuarioPasswordCommandHandler _handler;
+
+    public ResetUsuarioPasswordCommandHandlerTests()
+    {
+        _handler = new ResetUsuarioPasswordCommandHandler(_repo, _hasher, _refreshRepo);
+        _hasher.Hash(Arg.Any<string>()).Returns(args => "$2a$12$hashof_" + args[0]);
+    }
+
+    private static Usuario MakeUser(int id = 5)
+        => new(id, "user" + id, "$2a$12$hash", "Test", "User", null, "cajero", "[]", true);
+
+    [Fact]
+    public async Task Handle_Returns_TempPassword_MinLength12_With_Diversity()
+    {
+        _repo.GetByIdAsync(5, Arg.Any<CancellationToken>()).Returns(MakeUser(5));
+
+        var result = await _handler.Handle(new ResetUsuarioPasswordCommand(TargetId: 5, CallerId: 1));
+
+        Assert.True(result.TempPassword.Length >= 12, $"TempPassword too short: {result.TempPassword.Length}");
+        Assert.True(result.MustChangeOnLogin);
+    }
+
+    [Fact]
+    public async Task Handle_Calls_UpdatePasswordAsync_With_MustChange_True()
+    {
+        _repo.GetByIdAsync(5, Arg.Any<CancellationToken>()).Returns(MakeUser(5));
+
+        await _handler.Handle(new ResetUsuarioPasswordCommand(TargetId: 5, CallerId: 1));
+
+        await _repo.Received(1).UpdatePasswordAsync(
+            5,
+            Arg.Any<string>(),
+            mustChangePassword: true,
+            Arg.Any<CancellationToken>());
+    }
+
+    [Fact]
+    public async Task Handle_Revokes_All_Refresh_Tokens_Of_Target()
+    {
+        _repo.GetByIdAsync(5, Arg.Any<CancellationToken>()).Returns(MakeUser(5));
+
+        await _handler.Handle(new ResetUsuarioPasswordCommand(TargetId: 5, CallerId: 1));
+
+        await _refreshRepo.Received(1).RevokeAllActiveForUserAsync(5, Arg.Any<DateTime>(), Arg.Any<CancellationToken>());
+    }
+
+    [Fact]
+    public async Task Handle_Throws_UsuarioNotFoundException_When_Target_Not_Found()
+    {
+        _repo.GetByIdAsync(9999, Arg.Any<CancellationToken>()).Returns((Usuario?)null);
+
+        await Assert.ThrowsAsync<UsuarioNotFoundException>(
+            () => _handler.Handle(new ResetUsuarioPasswordCommand(TargetId: 9999, CallerId: 1)));
+    }
+
+    [Fact]
+    public async Task Handle_Throws_CannotSelfResetException_When_Caller_Equals_Target()
+    {
+        await Assert.ThrowsAsync<CannotSelfResetException>(
+            () => _handler.Handle(new ResetUsuarioPasswordCommand(TargetId: 1, CallerId: 1)));
+    }
+}