feat: add core persistence model

Tiku.IntegrationTests/PersistenceModelTests.cs

@@ -0,0 +1,68 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Tiku.Domain.QuestionBanks;
+using Tiku.Infrastructure.Persistence;
+
+namespace Tiku.IntegrationTests;
+
+public sealed class PersistenceModelTests
+{
+    private static readonly DbContextOptions<TikuDbContext> Options =
+        new DbContextOptionsBuilder<TikuDbContext>()
+            .UseNpgsql("Host=localhost;Database=tiku_model_tests;Username=postgres")
+            .Options;
+
+    [Fact]
+    public void Core_model_contains_expected_tables()
+    {
+        using var context = new TikuDbContext(Options);
+
+        var tableNames = context.Model.GetEntityTypes()
+            .Select(entity => entity.GetTableName())
+            .ToHashSet(StringComparer.Ordinal);
+
+        Assert.Equal(20, tableNames.Count);
+        Assert.Contains("tenants", tableNames);
+        Assert.Contains("questions", tableNames);
+        Assert.Contains("question_versions", tableNames);
+        Assert.Contains("answer_records", tableNames);
+    }
+
+    [Theory]
+    [InlineData(nameof(Question.Tags), "'[]'::jsonb")]
+    public void Question_json_properties_are_mapped_to_jsonb(
+        string propertyName,
+        string expectedDefaultValueSql)
+    {
+        using var context = new TikuDbContext(Options);
+
+        var property = context.Model.FindEntityType(typeof(Question))!
+            .FindProperty(propertyName)!;
+
+        Assert.Equal("jsonb", property.GetColumnType());
+        Assert.Equal(expectedDefaultValueSql, property.GetDefaultValueSql());
+        Assert.Equal(typeof(System.Text.Json.JsonElement), property.ClrType);
+    }
+
+    [Fact]
+    public void Question_relations_include_tenant_in_foreign_keys()
+    {
+        using var context = new TikuDbContext(Options);
+
+        var foreignKeys = context.Model.FindEntityType(typeof(Question))!
+            .GetForeignKeys()
+            .Select(foreignKey => foreignKey.Properties
+                .Select(property => property.Name)
+                .ToArray())
+            .ToArray();
+
+        Assert.All(
+            foreignKeys.Where(properties => properties.Length > 1),
+            properties => Assert.Contains("TenantId", properties));
+
+        Assert.Contains(
+            foreignKeys,
+            properties => properties.SequenceEqual(
+                ["TenantId", "Id", "CurrentVersionId"]));
+    }
+}