More tests

src/main/java/org/cqfn/astranaut/core/utils/FilesReader.java

@@ -65,6 +65,19 @@ public String readAsString() throws IOException {
         return builder.toString();
     }
 
+    /**
+     * Reads file content as a string. If the file can't be read, returns empty string.
+     * @return The file content
+     */
+    public String readAsStringNoExcept() {
+        String string = "";
+        try {
+            string = this.readAsString();
+        } catch (final IOException ignored) {
+        }
+        return string;
+    }
+
     /**
      * Reads file content as string.
      * @param creator The exception creator

src/test/java/org/cqfn/astranaut/core/utils/FilesReaderTest.java

@@ -0,0 +1,75 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2024 Ivan Kniazkov
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.cqfn.astranaut.core.utils;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/**
+ * Test for {@link FilesReader} class.
+ * @since 2.0.0
+ */
+class FilesReaderTest {
+    @Test
+    void wroteAndReadFile(@TempDir final Path tmpdir) {
+        final Path path = tmpdir.resolve("data.txt");
+        final FilesWriter writer = new FilesWriter(path.toString());
+        final boolean flag = writer.writeStringNoExcept("test\r string");
+        Assertions.assertTrue(flag);
+        Assertions.assertTrue(Files.exists(path));
+        final FilesReader reader = new FilesReader(path.toString());
+        boolean oops = false;
+        try {
+            final String result = reader.readAsString();
+            Assertions.assertEquals("test string", result);
+        } catch (final IOException ignored) {
+            oops = true;
+        }
+        Assertions.assertFalse(oops);
+    }
+
+    @Test
+    void testCustomException() {
+        final FilesReader reader = new FilesReader("path.to.file.that.does.not.exist");
+        boolean oops = false;
+        try {
+            reader.readAsString(CustomException::new);
+        } catch (final CustomException ignored) {
+            oops = true;
+        }
+        Assertions.assertTrue(oops);
+    }
+
+    /**
+     * Custom exception for testing purposes.
+     * @since 2.0.0
+     */
+    private static class CustomException extends Exception {
+        private static final long serialVersionUID = -1;
+    }
+}

src/test/java/org/cqfn/astranaut/core/utils/JsonDeserializerTest.java

@@ -25,7 +25,6 @@
 
 import java.util.Map;
 import java.util.TreeMap;
-import org.cqfn.astranaut.core.base.CoreException;
 import org.cqfn.astranaut.core.base.DefaultFactory;
 import org.cqfn.astranaut.core.base.EmptyTree;
 import org.cqfn.astranaut.core.base.Node;
@@ -160,32 +159,8 @@ void deserializeWithNullFactory() {
      */
     private String getFileContent(final String name) {
         final String file = JsonDeserializerTest.TESTS_PATH.concat(name);
-        boolean oops = false;
-        String source = "";
-        try {
-            source = new FilesReader(file).readAsString(
-                (FilesReader.CustomExceptionCreator<CoreException>) ()
-                    -> new CoreException() {
-                        private static final long serialVersionUID = -6130330765091840343L;
-
-                        @Override
-                        public String getInitiator() {
-                            return "JsonDeserializerTest";
-                        }
-
-                        @Override
-                        public String getErrorMessage() {
-                            return String.format(
-                                "Could not read the file that contains source tree: %s",
-                                file
-                            );
-                        }
-                    }
-            );
-        } catch (final CoreException exception) {
-            oops = true;
-        }
-        Assertions.assertFalse(oops);
+        final String source = new FilesReader(file).readAsStringNoExcept();
+        Assertions.assertFalse(source.isEmpty());
         return source;
     }
 }