Arrange Builder Factory test files

src/flatcollections-array/FlatArray.Tests/Tests.FlatArray.T.Builder/Factory/Factory.From.Array.cs

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+using System;
+using PrimeFuncPack.UnitTest;
+using Xunit;
+using static PrimeFuncPack.UnitTest.TestData;
+
+namespace PrimeFuncPack.Core.Tests;
+
+partial class FlatArrayBuilderTest
+{
+    [Fact]
+    public void FromArray_SourceIsNull_ExpectInnerStateIsDefault()
+    {
+        StructType[]? source = null;
+        var actual = FlatArray<StructType>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<StructType>(), default);
+    }
+
+    [Fact]
+    public void FromArray_SourceIsEmpty_ExpectInnerStateIsDefault()
+    {
+        var source = Array.Empty<RecordType>();
+        var actual = FlatArray<RecordType>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<RecordType>(), default);
+    }
+
+    [Theory]
+    [InlineData(Zero)]
+    [InlineData(PlusFifteen, Zero, MinusFifteen, PlusFifteen)]
+    [InlineData(12, 15, 1, 91, 7, -95, 975, 0, 5, 6, 7, 901, 98, -266, 78, 62, 21, 35, 75, 212, 51)]
+    public void FromArray_SourceIsNotEmpty_ExpectInnerStateIsSourceArray(
+        params int[] source)
+    {
+        var coppied = source.GetCopy();
+        var actual = FlatArray<int>.Builder.From(source);
+
+        actual.VerifyInnerState(coppied, coppied.Length);
+    }
+
+    [Fact]
+    public void FromArray_ThenModifySource_ExpectInnerStateHasNotChanged()
+    {
+        var sourceArray = new[] { "One", "Two", "Three" };
+        var actual = FlatArray<string>.Builder.From(sourceArray);
+
+        sourceArray[0] = "2";
+        var expectedItems = new[] { "One", "Two", "Three" };
+
+        actual.VerifyInnerState(expectedItems, expectedItems.Length);
+    }
+}

src/flatcollections-array/FlatArray.Tests/Tests.FlatArray.T.Builder/Factory/Factory.From.FlatArray.cs

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+using System;
+using PrimeFuncPack.UnitTest;
+using Xunit;
+using static PrimeFuncPack.UnitTest.TestData;
+
+namespace PrimeFuncPack.Core.Tests;
+
+partial class FlatArrayBuilderTest
+{
+    [Fact]
+    public void FromFlatArray_SourceIsDefault_ExpectInnerStateIsDefault()
+    {
+        var source = default(FlatArray<RefType>);
+        var actual = FlatArray<RefType>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<RefType>(), default);
+    }
+
+    [Theory]
+    [InlineData(SomeString, AnotherString)]
+    [InlineData(LowerSomeString, null, SomeString, EmptyString, WhiteSpaceString)]
+    public void FromFlatArray_SourceIsNotDefault_ExpectInnerStateIsSourceArray(
+        params string?[] sourceArray)
+    {
+        var coppied = sourceArray.GetCopy();
+
+        var source = sourceArray.InitializeFlatArray();
+        var actual = FlatArray<string?>.Builder.From(source);
+
+        actual.VerifyInnerState(coppied, coppied.Length);
+    }
+
+    [Fact]
+    public void FromNullableFlatArray_SourceIsNull_ExpectInnerStateIsDefault()
+    {
+        var source = default(FlatArray<StructType?>?);
+        var actual = FlatArray<StructType?>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<StructType?>(), default);
+    }
+
+    [Fact]
+    public void FromNullableFlatArray_SourceIsDefault_ExpectInnerStateIsDefault()
+    {
+        FlatArray<RecordType>? source = default(FlatArray<RecordType>);
+        var actual = FlatArray<RecordType>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<RecordType>(), default);
+    }
+
+    [Fact]
+    public void FromNullableFlatArray_SourceIsNotDefault_ExpectInnerStateIsSourceArray()
+    {
+        FlatArray<bool?>? source = new bool?[] { false, null, true }.InitializeFlatArray(2);
+
+        var actual = FlatArray<bool?>.Builder.From(source);
+        var expectedItems = new bool?[] { false, null };
+
+        actual.VerifyInnerState(expectedItems, expectedItems.Length);
+    }
+}

src/flatcollections-array/FlatArray.Tests/Tests.FlatArray.T.Builder/Factory/Factory.From.ImmutableArray.cs

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+using System;
+using System.Collections.Immutable;
+using PrimeFuncPack.UnitTest;
+using Xunit;
+using static PrimeFuncPack.UnitTest.TestData;
+
+namespace PrimeFuncPack.Core.Tests;
+
+partial class FlatArrayBuilderTest
+{
+    [Fact]
+    public void FromImmutableArray_SourceIsDefault_ExpectInnerStateIsDefault()
+    {
+        var source = default(ImmutableArray<long?>);
+        var actual = FlatArray<long?>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<long?>(), default);
+    }
+
+    [Theory]
+    [InlineData(SomeString)]
+    [InlineData(LowerSomeString, null, AnotherString)]
+    public void FromImmutableArray_SourceIsNotDefault_ExpectInnerStateAreSourceItems(
+        params string?[] sourceArray)
+    {
+        var coppied = sourceArray.GetCopy();
+
+        var source = sourceArray.ToImmutableArray();
+        var actual = FlatArray<string?>.Builder.From(source);
+
+        actual.VerifyInnerState(coppied, coppied.Length);
+    }
+
+    [Fact]
+    public void FromNullableImmutableArray_SourceIsNull_ExpectInnerStateIsDefault()
+    {
+        ImmutableArray<RecordType>? source = null;
+        var actual = FlatArray<RecordType>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<RecordType>(), default);
+    }
+
+    [Fact]
+    public void FromNullableImmutableArray_SourceIsDefault_ExpectInnerStateIsDefault()
+    {
+        ImmutableArray<RefType?>? source = new ImmutableArray<RefType?>();;
+        var actual = FlatArray<RefType?>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<RefType?>(), default);
+    }
+
+    [Theory]
+    [InlineData(PlusFifteen)]
+    [InlineData(null, MinusFifteen, Zero)]
+    public void FromNullableImmutableArray_SourceIsNotDefault_ExpectInnerStateAreSourceItems(
+        params int?[] sourceItems)
+    {
+        var coppied = sourceItems.GetCopy();
+
+        var source = sourceItems.ToImmutableArray();
+        var actual = FlatArray<int?>.Builder.From(source);
+
+        actual.VerifyInnerState(coppied, coppied.Length);
+    }
+}

src/flatcollections-array/FlatArray.Tests/Tests.FlatArray.T.Builder/Factory/Factory.From.List.cs

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+using System;
+using System.Collections.Generic;
+using PrimeFuncPack.UnitTest;
+using Xunit;
+using static PrimeFuncPack.UnitTest.TestData;
+
+namespace PrimeFuncPack.Core.Tests;
+
+partial class FlatArrayBuilderTest
+{
+    [Fact]
+    public void FromList_SourceIsNull_ExpectInnerStateIsDefault()
+    {
+        List<DateOnly>? source = null;
+        var actual = FlatArray<DateOnly>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<DateOnly>(), default);
+    }
+
+    [Fact]
+    public void FromList_SourceIsEmpty_ExpectInnerStateIsDefault()
+    {
+        var source = new List<RefType>();
+        var actual = FlatArray<RefType>.Builder.From(source);
+
+        actual.VerifyInnerState(Array.Empty<RefType>(), default);
+    }
+
+    [Fact]
+    public void FromList_SourceIsNotEmpty_ExpectInnerStateAreSourceItems()
+    {
+        var source = new List<RecordStruct?>
+        {
+            SomeTextRecordStruct, null, AnotherTextRecordStruct
+        };
+
+        var actual = FlatArray<RecordStruct?>.Builder.From(source);
+
+        const int expectedLength = 3;
+        var expectedItems = new RecordStruct?[]
+        {
+            SomeTextRecordStruct, null, AnotherTextRecordStruct
+        };
+
+        actual.VerifyInnerState(expectedItems, expectedLength);
+    }
+
+    [Fact]
+    public void FromList_ThenModifySource_ExpectInnerStateHasNotChanged()
+    {
+        var sourceList = new List<RecordType>
+        {
+            MinusFifteenIdSomeStringNameRecord, ZeroIdNullNameRecord, PlusFifteenIdSomeStringNameRecord
+        };
+
+        var actual = FlatArray<RecordType>.Builder.From(sourceList);
+
+        sourceList[0] = PlusFifteenIdLowerSomeStringNameRecord;
+        sourceList.Add(MinusFifteenIdNullNameRecord);
+
+        const int expectedLength = 3;
+        var expectedItems = new[]
+        {
+            MinusFifteenIdSomeStringNameRecord, ZeroIdNullNameRecord, PlusFifteenIdSomeStringNameRecord
+        };
+
+        actual.VerifyInnerState(expectedItems, expectedLength);
+    }
+}