add test files

Author: MAfarrag

tests/data/files/text_1.txt

@@ -0,0 +1,10 @@
+Birds are a group of warm-blooded vertebrates constituting the class Aves (/ˈeɪviːz/), characterised by feathers,
+toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet
+lightweight skeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m
+(9 ft 2 in) common ostrich. There are over 11,000 living species, more than half of which are passerine, or "perching"
+birds. Birds have wings whose development varies according to species; the only known groups without wings are the
+extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further
+evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species.
+The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic
+environments, particularly seabirds and some waterbirds, have further evolved for swimming. The study of birds is called
+ornithology.

tests/data/files/text_2.txt

@@ -0,0 +1,6 @@
+Birds are feathered theropod dinosaurs and constitute the only known living dinosaurs. Likewise, birds are considered
+reptiles in the modern cladistic sense of the term, and their closest living relatives are the crocodilians. Birds are
+descendants of the primitive avialans (whose members include Archaeopteryx) which first appeared during the Late
+Jurassic. According to recent estimates, modern birds (Neornithes) evolved in the Late Cretaceous and diversified
+dramatically around the time of the Cretaceous–Paleogene extinction event 66 million years ago, which killed off the
+pterosaurs and all non-avian dinosaurs.[7]

tests/data/files/text_3.txt

@@ -0,0 +1,7 @@
+Many social species preserve knowledge across generations (culture). Birds are social, communicating with visual
+signals, calls, and songs, and participating in such behaviours as cooperative breeding and hunting, flocking, and
+mobbing of predators. The vast majority of bird species are socially (but not necessarily sexually) monogamous, usually
+for one breeding season at a time, sometimes for years, and rarely for life. Other species have breeding systems that
+are polygynous (one male with many females) or, rarely, polyandrous (one female with many males). Birds produce
+offspring by laying eggs which are fertilised through sexual reproduction. They are usually laid in a nest and incubated
+by the parents. Most birds have an extended period of parental care after hatching.

tests/data/files/text_4.txt

@@ -0,0 +1,6 @@
+Many species of birds are economically important as food for human consumption and raw material in manufacturing, with
+domesticated and undomesticated birds being important sources of eggs, meat, and feathers. Songbirds, parrots, and other
+species are popular as pets. Guano (bird excrement) is harvested for use as a fertiliser. Birds figure throughout human
+culture. About 120 to 130 species have become extinct due to human activity since the 17th century, and hundreds more
+before then. Human activity threatens about 1,200 bird species with extinction, though efforts are underway to protect
+them. Recreational birdwatching is an important part of the ecotourism industry.