Add instrumented test which checks if conversion does not crash.

Sadly, converting twice does crash.

Author: ViliusSutkus89

pdf2htmlEX/build.gradle

@@ -41,6 +41,8 @@ android {
         archivesBaseName = rootProject.name
 
         ndk.abiFilters = project.hasProperty('abi') ? [ project.property('abi') ] : null
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes.release.externalNativeBuild {
       cmake.arguments '-DCMAKE_BUILD_TYPE=MinSizeRel'
@@ -267,6 +269,9 @@ dependencies {
     compileOnly project(":dependency-builder")
     implementation 'com.viliussutkus89:tmpfile-android:1.0.2'
     implementation 'androidx.annotation:annotation:1.1.0'
+
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 }
 
 task extractLibtmpfileSoForLinkingInCMake {

pdf2htmlEX/src/androidTest/assets/fontfile3_opentype.pdf

@@ -0,0 +1,112 @@
+/*
+ * InstrumentedTests.java
+ *
+ * Copyright (C) 2019 Vilius Sutkus'89
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+package com.viliussutkus89.android.pdf2htmlex;
+
+import android.app.Instrumentation;
+import android.content.Context;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+@RunWith(AndroidJUnit4.class)
+public class InstrumentedTests {
+
+  private File extractAssetPDF(String filename) throws IOException {
+    Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
+    Context appContext = instrumentation.getTargetContext();
+    File mInputDir = new File(appContext.getCacheDir(), "PDFs-extracted-from-assets");
+    if (!mInputDir.mkdir()) {
+      assertTrue("Failed to create folder for input PDFs", mInputDir.exists());
+    }
+
+    Context testContext = instrumentation.getContext();
+    InputStream is = testContext.getAssets().open(filename);
+    File fileInCache = new File(mInputDir, filename);
+    copyFile(is, new FileOutputStream(fileInCache));
+    assertTrue("Failed to copy input PDF", fileInCache.exists());
+    return fileInCache;
+  }
+
+  private void copyFile(InputStream input, OutputStream output) throws IOException {
+    final int buffer_size = 1024;
+    byte[] buffer = new byte[buffer_size];
+
+    BufferedInputStream in = new BufferedInputStream(input, buffer_size);
+    BufferedOutputStream out = new BufferedOutputStream(output, buffer_size);
+
+    int haveRead;
+    while (-1 != (haveRead = in.read(buffer))) {
+      out.write(buffer, 0, haveRead);
+    }
+    out.flush();
+    out.close();
+    output.close();
+    in.close();
+    input.close();
+  }
+
+  @Test
+  public synchronized void conversionTest() {
+    File pdfFile, htmlFile;
+    try {
+      pdfFile = extractAssetPDF("fontfile3_opentype.pdf");
+    } catch (IOException e) {
+      e.printStackTrace();
+      fail("Failed to extract PDF from assets");
+      return;
+    }
+
+    pdf2htmlEX converter = new pdf2htmlEX(InstrumentationRegistry.getInstrumentation().getTargetContext());
+    try {
+      htmlFile = converter.convert(pdfFile);
+    } catch (IOException e) {
+      e.printStackTrace();
+      fail("Failed to convert PDF to HTML");
+      return;
+    } catch (pdf2htmlEX.ConversionFailedException e) {
+      e.printStackTrace();
+      fail("Failed to convert PDF to HTML");
+      return;
+    }
+    assertTrue("Converted HTML file not found!", htmlFile.exists());
+    assertTrue("Converted HTML file empty!", htmlFile.length() > 0);
+  }
+
+  @Test
+  public void conversionTwiceTest() {
+    conversionTest();
+    conversionTest();
+  }
+
+}