Added solution for "Day 3: Gear Ratios", part 1, and added test project

tests/AdventOfCodeFPCUnit.fpcunit.ini

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+[WindowState]
+Left=664
+Top=189
+Width=575
+Height=663
+
+[Tests]
+All Tests.Checked=1
+All Tests.Expanded=1
+TGearRatiosTestCase.Checked=1
+TGearRatiosTestCase.Expanded=1
+TGearRatiosTestCase.TestPuzzleExample.Checked=1
+TGearRatiosTestCase.TestPuzzleExample.Expanded=0
+TGearRatiosTestCase.TestEndOfLineNumber.Checked=1
+TGearRatiosTestCase.TestEndOfLineNumber.Expanded=0

tests/AdventOfCodeFPCUnit.lpi

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+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="12"/>
+    <PathDelim Value="\"/>
+    <General>
+      <SessionStorage Value="InProjectDir"/>
+      <Title Value="AdventOfCodeFPCUnit"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+      <Icon Value="0"/>
+    </General>
+    <BuildModes>
+      <Item Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <UseFileFilters Value="True"/>
+    </PublishOptions>
+    <RunParams>
+      <FormatVersion Value="2"/>
+    </RunParams>
+    <RequiredPackages>
+      <Item>
+        <PackageName Value="fpcunittestrunner"/>
+      </Item>
+      <Item>
+        <PackageName Value="LCL"/>
+      </Item>
+      <Item>
+        <PackageName Value="FCL"/>
+      </Item>
+    </RequiredPackages>
+    <Units>
+      <Unit>
+        <Filename Value="AdventOfCodeFPCUnit.lpr"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
+      <Unit>
+        <Filename Value="UGearRatiosTestCases.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
+      <Unit>
+        <Filename Value="..\USolver.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <PathDelim Value="\"/>
+    <Target>
+      <Filename Value="AdventOfCodeFPCUnit"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <OtherUnitFiles Value="..\solvers;.."/>
+      <UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <Debugging>
+        <DebugInfoType Value="dsDwarf3"/>
+      </Debugging>
+      <Options>
+        <Win32>
+          <GraphicApplication Value="True"/>
+        </Win32>
+      </Options>
+    </Linking>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions>
+      <Item>
+        <Name Value="EAbort"/>
+      </Item>
+      <Item>
+        <Name Value="ECodetoolError"/>
+      </Item>
+      <Item>
+        <Name Value="EFOpenError"/>
+      </Item>
+    </Exceptions>
+  </Debugging>
+</CONFIG>

tests/AdventOfCodeFPCUnit.lpr

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+program AdventOfCodeFPCUnit;
+
+{$mode objfpc}{$H+}
+
+uses
+  Interfaces, Forms, GuiTestRunner, UGearRatiosTestCases, USolver;
+
+{$R *.res}
+
+begin
+  Application.Initialize;
+  Application.CreateForm(TGuiTestRunner, TestRunner);
+  Application.Run;
+end.
+

tests/UGearRatiosTestCases.pas

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+{
+  Solutions to the Advent Of Code.
+  Copyright (C) 2023  Stefan Müller
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <http://www.gnu.org/licenses/>.
+}
+
+unit UGearRatiosTestCases;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, fpcunit, testregistry, UGearRatios;
+
+type
+
+  { TGearRatiosTestCase }
+
+  TGearRatiosTestCase = class(TTestCase)
+  protected
+    FSolver: TGearRatios;
+    procedure Setup; override;
+    procedure TearDown; override;
+  published
+    procedure TestPuzzleExample;
+    procedure TestEndOfLineNumber;
+  end;
+
+implementation
+
+{ TGearRatiosTestCase }
+
+procedure TGearRatiosTestCase.Setup;
+begin
+  FSolver := TGearRatios.Create;
+end;
+
+procedure TGearRatiosTestCase.TearDown;
+begin
+  FSolver.Free;
+end;
+
+procedure TGearRatiosTestCase.TestPuzzleExample;
+begin
+  FSolver.Init;
+  FSolver.ProcessDataLine('467..114..');
+  FSolver.ProcessDataLine('...*......');
+  FSolver.ProcessDataLine('..35..633.');
+  FSolver.ProcessDataLine('......#...');
+  FSolver.ProcessDataLine('617*......');
+  FSolver.ProcessDataLine('.....+.58.');
+  FSolver.ProcessDataLine('..592.....');
+  FSolver.ProcessDataLine('......755.');
+  FSolver.ProcessDataLine('...$.*....');
+  FSolver.ProcessDataLine('.664.598..');
+  FSolver.Finish;
+  AssertEquals('Result of part 1 calculation incorrect.', 4361, FSolver.GetResultPart1);
+end;
+
+procedure TGearRatiosTestCase.TestEndOfLineNumber;
+begin
+  FSolver.Init;
+  FSolver.ProcessDataLine('...$541');
+  FSolver.Finish;
+  AssertEquals('Result of part 1 calculation incorrect.', 541, FSolver.GetResultPart1);
+end;
+
+initialization
+
+  RegisterTest(TGearRatiosTestCase);
+end.