REFACTOR: Simplify backup version check

Adds specs for inalid version number in metadata file.
Follow-up to c3cd2389fe

lib/backup_restore/meta_data_handler.rb

@@ -19,11 +19,7 @@ module BackupRestore
     def validate
       metadata = extract_metadata
 
-      if metadata[:version].blank?
-        raise MetaDataError.new("Version not defined in metadata file.")
-      end
-
-      if !metadata[:version].is_a?(String) && !metadata[:version].is_a?(Integer)
+      if !metadata[:version].is_a?(Integer)
         raise MetaDataError.new("Version is not in a valid format.")
       end
 

spec/lib/backup_restore/meta_data_handler_spec.rb

@@ -23,52 +23,77 @@ describe BackupRestore::MetaDataHandler do
     BackupRestore::MetaDataHandler.new(logger, filename, tmp_directory).validate
   end
 
-  it "extracts metadata from file when metadata file exists" do
-    metadata = '{"source":"discourse","version":20160329101122}'
+  context "metadata file" do
+    it "extracts metadata from file when metadata file exists" do
+      metadata = '{"source":"discourse","version":20160329101122}'
 
-    with_metadata_file(metadata) do |dir|
-      expect(validate_metadata(backup_filename, dir))
-        .to include(version: 20160329101122)
+      with_metadata_file(metadata) do |dir|
+        expect(validate_metadata(backup_filename, dir))
+          .to include(version: 20160329101122)
+      end
+    end
+
+    it "raises an exception when the metadata file contains invalid JSON" do
+      currupt_metadata = '{"version":20160329101122'
+
+      with_metadata_file(currupt_metadata) do |dir|
+        expect { validate_metadata(backup_filename, dir) }
+          .to raise_error(BackupRestore::MetaDataError)
+      end
+    end
+
+    it "raises an exception when the metadata file is empty" do
+      with_metadata_file('') do |dir|
+        expect { validate_metadata(backup_filename, dir) }
+          .to raise_error(BackupRestore::MetaDataError)
+      end
+    end
+
+    it "raises an exception when the metadata file contains an invalid version number" do
+      metadata = '{"source":"discourse","version":"1abcdefghijklm"}'
+
+      with_metadata_file(metadata) do |dir|
+        expect { validate_metadata(backup_filename, dir) }
+          .to raise_error(BackupRestore::MetaDataError)
+      end
+    end
+
+    it "raises an exception when the metadata file contains an empty version number" do
+      metadata = '{"source":"discourse","version":""}'
+
+      with_metadata_file(metadata) do |dir|
+        expect { validate_metadata(backup_filename, dir) }
+          .to raise_error(BackupRestore::MetaDataError)
+      end
     end
   end
 
-  it "extracts metadata from filename when metadata file does not exist" do
-    with_metadata_file(nil) do |dir|
-      expect(validate_metadata(backup_filename, dir))
-        .to include(version: 20191108000414)
+  context "filename" do
+    it "extracts metadata from filename when metadata file does not exist" do
+      with_metadata_file(nil) do |dir|
+        expect(validate_metadata(backup_filename, dir))
+          .to include(version: 20191108000414)
+      end
     end
-  end
 
-  it "raises an exception when the metadata file contains invalid JSON" do
-    currupt_metadata = '{"version":20160329101122'
+    it "raises an exception when the filename contains no version number" do
+      filename = 'discourse-2019-11-18-143242.tar.gz'
 
-    with_metadata_file(currupt_metadata) do |dir|
-      expect { validate_metadata(backup_filename, dir) }
+      expect { validate_metadata(filename, nil) }
         .to raise_error(BackupRestore::MetaDataError)
     end
-  end
 
-  it "raises an exception when the metadata file is empty" do
-    with_metadata_file('') do |dir|
-      expect { validate_metadata(backup_filename, dir) }
+    it "raises an exception when the filename contains an invalid version number" do
+      filename = 'discourse-2019-11-18-143242-v123456789.tar.gz'
+      expect { validate_metadata(filename, nil) }
+        .to raise_error(BackupRestore::MetaDataError)
+
+      filename = 'discourse-2019-11-18-143242-v1abcdefghijklm.tar.gz'
+      expect { validate_metadata(filename, nil) }
         .to raise_error(BackupRestore::MetaDataError)
     end
   end
 
-  it "raises an exception when the filename contains no version number" do
-    filename = 'discourse-2019-11-18-143242.tar.gz'
-
-    expect { validate_metadata(filename, nil) }
-      .to raise_error(BackupRestore::MetaDataError)
-  end
-
-  it "raises an exception when the filename contains an invalid version number" do
-    filename = 'discourse-2019-11-18-143242-v123456789.tar.gz'
-
-    expect { validate_metadata(filename, nil) }
-      .to raise_error(BackupRestore::MetaDataError)
-  end
-
   it "raises an exception when the backup's version is newer than the current version" do
     new_backup_filename = 'discourse-2019-11-18-143242-v20191113193141.sql.gz'