array: more tests of initialization

vlib/v/tests/array_init_test.v

@@ -39,3 +39,91 @@ fn test_array_init_with_len_no_default() {
 	a3 := []bool{len: 3}
 	assert '$a3' == '[false, false, false]'
 }
+
+fn test_array_int_full_options() {
+	println('Test array of int values')
+
+	a := []int{len: 2, cap: 10} // this creates an array with 2 items, initial capacity 10, default value of array type
+	println('array a: length: ${a.len}, capacity: ${a.cap}, content: $a')
+	assert a.len == 2
+	assert a.cap == 10
+	assert a.cap >= a.len
+	assert a.str() == "[0, 0]"
+
+	b := []int{len: 10, cap: 100, init: 1} // this creates an array with 10 one and initial capacity 100 elements, value given
+	_ := b.clone() // discard result variable, sample
+	println('array b: length: ${b.len}, capacity: ${b.cap}, content: $b')
+	assert b.len == 10
+	assert b.cap == 100
+	assert b.cap >= b.len
+	assert b.str() == "[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]"
+
+	mut c := []int{len: 2, cap: 10, init: 1} // this creates an array with 2 one and initial capacity 10 elements, value given
+	_ := c.clone() // discard result variable, sample
+	println('array c: length: ${c.len}, capacity: ${c.cap}, content: $c')
+	assert c.len == 2
+	assert c.cap == 10
+	assert c.cap >= c.len
+	assert c.str() == "[1, 1]"
+	// add some items to the array, to check limits
+	c << [3, 4, 5, 6, 7, 8, 9, 10] // add 8 items, from another array
+	// update one item, to have the right number in the sequence ...
+	c[1] = 2
+	println('array c: length: ${c.len}, capacity: ${c.cap}, content now: $c')
+	assert c.len == 10
+	assert c.cap == 10
+	assert c.cap >= c.len
+	assert c.str() == "[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]"
+	// add some more item after initial capacity, to ensure it's expandable
+	c << [11, 12, 13, 14, 15, 16]
+	println('array c: length: ${c.len}, capacity: ${c.cap}, content now: $c')
+	assert c.len == 16
+	assert c.cap >= c.len
+	assert c.str() == "[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]"
+}
+
+fn test_array_string_full_options() {
+	println('Test array of string values')
+
+	a := []string{len: 2, cap: 10} // this creates an array with 2 items, initial capacity 10, default value of array type
+	println('array a: length: ${a.len}, capacity: ${a.cap}') // ok
+	println('array a: length: ${a.len}, capacity: ${a.cap}, content: "$a"')
+	assert a.len == 2
+	assert a.cap == 10
+	assert a.cap >= a.len
+	assert a.str() == "['', '']"
+
+	b := []string{len: 10, cap: 100, init: 'b'} // this creates an array with 10 'b', initial capacity 100 elements, value given
+	_ := b.clone() // discard result variable, sample
+	println('array b: length: ${b.len}, capacity: ${b.cap}') // ok
+	println('array b: length: ${b.len}, capacity: ${b.cap}, content: $b')
+	assert b.len == 10
+	assert b.cap == 100
+	assert b.cap >= b.len
+	assert b.str() == "['b', 'b', 'b', 'b', 'b', 'b', 'b', 'b', 'b', 'b']"
+
+	mut c := []string{len: 2, cap: 10, init: 'c'} // this creates an array with 2 'c' and initial capacity 10 elements, value given
+	_ := c.clone() // discard result variable, sample
+	println('array c: length: ${c.len}, capacity: ${c.cap}, content: $c')
+	assert c.len == 2
+	assert c.cap == 10
+	assert c.cap >= c.len
+	assert c.str() == "['c', 'c']"
+	// add some items to the array, to check limits
+	c << ['c', 'c', 'c', 'c', 'c', 'c', 'c', 'c'] // add 8 items, from another array
+	// update some items, to have the right number in the sequence ...
+	c[0] = 'a'
+	c[1] = 'b'
+	println('array c: length: ${c.len}, capacity: ${c.cap}, content now: $c')
+	assert c.len == 10
+	assert c.cap == 10
+	assert c.cap >= c.len
+	assert c.str() == "['a', 'b', 'c', 'c', 'c', 'c', 'c', 'c', 'c', 'c']"
+	// add some more item after initial capacity, to ensure all is good
+	c << ['11', '12', '13', '14', '15', '16']
+	// c << ['11', nil, '13', '14', '15', '16'] // check later if/how to handle this ...
+	println('array c: length: ${c.len}, capacity: ${c.cap}, content now: $c')
+	assert c.len == 16
+	assert c.cap >= c.len
+	assert c.str() == "['a', 'b', 'c', 'c', 'c', 'c', 'c', 'c', 'c', 'c', '11', '12', '13', '14', '15', '16']"
+}