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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example မြန်မာဘာသာ: Testing and Benchmarking</title>
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</head>
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<div class="example" id="testing-and-benchmarking">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Testing and Benchmarking</h2>
<table>
<tr>
<td class="docs">
<p>Unit testing သည် အခြေခံကျသော Go ပရိုဂရမ်များ ရေးသားရာတွင် အရေးကြီးသော အပိုင်းတစ်ခုဖြစ်သည်။ <code>testing</code> package က
unit test များရေးသားရန် လိုအပ်သော tools များကို ပေးပြီး <code>go test</code> command က test များကို run ပေးသည်။</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
<p>သရုပ်ပြရန်အတွက် ဤ code သည် <code>main</code> package တွင်ရှိသော်လည်း မည်သည့် package တွင်မဆို ဖြစ်နိုင်သည်။ Testing code သည်
အများအားဖြင့် ၎င်းစစ်ဆေးသော code နှင့် package နှင့်အတး တည်ရှိလေ့ရှိသည်။</p>
</td>
<td class="code leading">
<a href="https://go.dev/play/p/-ntBEIX718-"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma">
<span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">"fmt"</span>
<span class="s">"testing"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ကျွန်ုပ်တို့သည် ကိန်းဂဏန်း အနည်းဆုံးတန်ဖိုးရှာသော ရိုးရှင်းသောအကောင်အထည်ဖော်မှုကို စမ်းသပ်မည်ဖြစ်သည်။ ပုံမှန်အားဖြင့်
ကျွန်ုပ်တို့စစ်ဆေးနေသော code သည် <code>intutils.go</code> ကဲ့သို့သော အမည်ရှိ source file တွင်ရှိမည်ဖြစ်ပြီး ၎င်းအတွက် test file မှာ
<code>intutils_test.go</code> ဟု အမည်ပေးမည်ဖြစ်သည်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="nf">IntMin</span><span class="p">(</span><span class="nx">a</span><span class="p">,</span> <span class="nx">b</span> <span class="kt">int</span><span class="p">)</span> <span class="kt">int</span> <span class="p">{</span>
<span class="k">if</span> <span class="nx">a</span> <span class="p"><</span> <span class="nx">b</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">a</span>
<span class="p">}</span>
<span class="k">return</span> <span class="nx">b</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>Test</code> ဖြင့်စသော အမည်ရှိ function တစ်ခုရေးခြင်းဖြင့် test တစ်ခုကို ဖန်တီးသည်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="nf">TestIntMinBasic</span><span class="p">(</span><span class="nx">t</span> <span class="o">*</span><span class="nx">testing</span><span class="p">.</span><span class="nx">T</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">ans</span> <span class="o">:=</span> <span class="nf">IntMin</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="o">-</span><span class="mi">2</span><span class="p">)</span>
<span class="k">if</span> <span class="nx">ans</span> <span class="o">!=</span> <span class="o">-</span><span class="mi">2</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>t.Error*</code> သည် test အောင်မြင်မှုမရှိကြောင်း report လုပ်သော်လည်း test ကို ဆက်လက်အကောင်အထည်ဖော် (execute)မည်။
<code>t.Fatal*</code> သည် test အောင်မြင်မှုမရှိကြောင်း report လုပ်ပြီး test ကို ချက်ချင်းရပ်တန့်စေမည်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">t</span><span class="p">.</span><span class="nf">Errorf</span><span class="p">(</span><span class="s">"IntMin(2, -2) = %d; want -2"</span><span class="p">,</span> <span class="nx">ans</span><span class="p">)</span>
<span class="p">}</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Test များရေးသားခြင်းသည် ထပ်ခါတလဲလဲဖြစ်နိုင်သောကြောင့် <em>table-driven style</em> ကို အသုံးပြုရန် ထုံးစံဖြစ်သည်။
ဤနည်းတွင် test input များနှင့် မျှော်မှန်းထားသော output များကို ဇယားတစ်ခုတွင် စာရင်းပြုစုထားပြီး loop တစ်ခုက
၎င်းတို့ကိုလိုက်လံစစ်ဆေးကာ test logic ကို အကောင်အထည်ဖော်သည်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="nf">TestIntMinTableDriven</span><span class="p">(</span><span class="nx">t</span> <span class="o">*</span><span class="nx">testing</span><span class="p">.</span><span class="nx">T</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">tests</span> <span class="p">=</span> <span class="p">[]</span><span class="kd">struct</span> <span class="p">{</span>
<span class="nx">a</span><span class="p">,</span> <span class="nx">b</span> <span class="kt">int</span>
<span class="nx">want</span> <span class="kt">int</span>
<span class="p">}{</span>
<span class="p">{</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">},</span>
<span class="p">{</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">},</span>
<span class="p">{</span><span class="mi">2</span><span class="p">,</span> <span class="o">-</span><span class="mi">2</span><span class="p">,</span> <span class="o">-</span><span class="mi">2</span><span class="p">},</span>
<span class="p">{</span><span class="mi">0</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">},</span>
<span class="p">{</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">},</span>
<span class="p">}</span>
<span class="k">for</span> <span class="nx">_</span><span class="p">,</span> <span class="nx">tt</span> <span class="o">:=</span> <span class="k">range</span> <span class="nx">tests</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>t.Run သည် “subtest” များကို run နိုင်စေသည်။ ဇယားထဲရှိ entry တစ်ခုစီအတွက် တစ်ခုစီဖြစ်သည်။
၎င်းတို့ကို <code>go test -v</code> run သောအခါ သီးခြားစီပြသသည်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">testname</span> <span class="o">:=</span> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Sprintf</span><span class="p">(</span><span class="s">"%d,%d"</span><span class="p">,</span> <span class="nx">tt</span><span class="p">.</span><span class="nx">a</span><span class="p">,</span> <span class="nx">tt</span><span class="p">.</span><span class="nx">b</span><span class="p">)</span>
<span class="nx">t</span><span class="p">.</span><span class="nf">Run</span><span class="p">(</span><span class="nx">testname</span><span class="p">,</span> <span class="kd">func</span><span class="p">(</span><span class="nx">t</span> <span class="o">*</span><span class="nx">testing</span><span class="p">.</span><span class="nx">T</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">ans</span> <span class="o">:=</span> <span class="nf">IntMin</span><span class="p">(</span><span class="nx">tt</span><span class="p">.</span><span class="nx">a</span><span class="p">,</span> <span class="nx">tt</span><span class="p">.</span><span class="nx">b</span><span class="p">)</span>
<span class="k">if</span> <span class="nx">ans</span> <span class="o">!=</span> <span class="nx">tt</span><span class="p">.</span><span class="nx">want</span> <span class="p">{</span>
<span class="nx">t</span><span class="p">.</span><span class="nf">Errorf</span><span class="p">(</span><span class="s">"got %d, want %d"</span><span class="p">,</span> <span class="nx">ans</span><span class="p">,</span> <span class="nx">tt</span><span class="p">.</span><span class="nx">want</span><span class="p">)</span>
<span class="p">}</span>
<span class="p">})</span>
<span class="p">}</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Benchmark test များသည် အများအားဖြင့် <code>_test.go</code> file များတွင်ရှိပြီး <code>Benchmark</code> ဖြင့်စသော အမည်ရှိကြသည်။
<code>testing</code> runner သည် benchmark function တစ်ခုစီကို အကြိမ်ပေါင်းများစွာ run ပြီး တိကျသောတိုင်းတာမှုရရှိသည်အထိ
<code>b.N</code> ကို တိုးမြှင့်သွားသည်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="nf">BenchmarkIntMin</span><span class="p">(</span><span class="nx">b</span> <span class="o">*</span><span class="nx">testing</span><span class="p">.</span><span class="nx">B</span><span class="p">)</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ပုံမှန်အားဖြင့် benchmark သည် ကျွန်ုပ်တို့ benchmark လုပ်နေသော function ကို <code>b.N</code> အကြိမ် loop ပတ်၍ run သည်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="k">for</span> <span class="nx">i</span> <span class="o">:=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="p"><</span> <span class="nx">b</span><span class="p">.</span><span class="nx">N</span><span class="p">;</span> <span class="nx">i</span><span class="o">++</span> <span class="p">{</span>
<span class="nf">IntMin</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="p">}</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
<p>လက်ရှိ project ထဲက test အားလုံးကို
verbose mode နဲ့ run ပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="gp">$</span> go test -v
<span class="go">== RUN TestIntMinBasic
</span><span class="go">--- PASS: TestIntMinBasic (0.00s)
</span><span class="go">=== RUN TestIntMinTableDriven
</span><span class="go">=== RUN TestIntMinTableDriven/0,1
</span><span class="go">=== RUN TestIntMinTableDriven/1,0
</span><span class="go">=== RUN TestIntMinTableDriven/2,-2
</span><span class="go">=== RUN TestIntMinTableDriven/0,-1
</span><span class="go">=== RUN TestIntMinTableDriven/-1,0
</span><span class="go">--- PASS: TestIntMinTableDriven (0.00s)
</span><span class="go"> --- PASS: TestIntMinTableDriven/0,1 (0.00s)
</span><span class="go"> --- PASS: TestIntMinTableDriven/1,0 (0.00s)
</span><span class="go"> --- PASS: TestIntMinTableDriven/2,-2 (0.00s)
</span><span class="go"> --- PASS: TestIntMinTableDriven/0,-1 (0.00s)
</span><span class="go"> --- PASS: TestIntMinTableDriven/-1,0 (0.00s)
</span><span class="go">PASS
</span><span class="go">ok examples/testing-and-benchmarking 0.023s</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>လက်ရှိ project ထဲက benchmark အားလုံးကို run ပါ။
benchmark တွေ မ run ခင်
test အားလုံးကို အရင် run ပါတယ်။
<code>bench</code> flag က benchmark function
အမည်တွေကို regexp နဲ့ filter လုပ်ပါတယ်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="gp">$</span> go test -bench=.
<span class="go">goos: darwin
</span><span class="go">goarch: arm64
</span><span class="go">pkg: examples/testing
</span><span class="go">BenchmarkIntMin-8 1000000000 0.3136 ns/op
</span><span class="go">PASS
</span><span class="go">ok examples/testing-and-benchmarking 0.351s</span></pre>
</td>
</tr>
</table>
<p class="next">
နောက်ဥပမာ: <a href="command-line-arguments">Command-Line Arguments</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> နှင့် <a href="https://eli.thegreenplace.net">Eli Bendersky</a> | <a href="https://github.com/mmcgrana/gobyexample">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
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