difference_of_squares: Sync tests & add template (#2047)

[no important files changed]

Author: ellnix

exercises/practice/difference-of-squares/.meta/test_template.tera

@@ -0,0 +1,26 @@
+use difference_of_squares as squares;
+
+{% for group in cases %}
+{% for test in group.cases %}
+
+{% if test.property == "squareOfSum" %}
+    {% set function = "square_of_sum" %}
+{% elif test.property == "sumOfSquares" %}
+    {% set function = "sum_of_squares" %}
+{% elif test.property == "differenceOfSquares" %}
+    {% set function = "difference" %}
+{% endif %}
+
+{% filter replace(from="difference_of_squares", to="difference") %}
+#[test]
+#[ignore]
+fn {{ test.description | make_ident }}() {
+    assert_eq!(
+        {{ test.expected | fmt_num }}, 
+        squares::{{ function }}({{ test.input.number }})
+    );
+}
+{% endfilter %}
+
+{% endfor -%}
+{% endfor -%}

exercises/practice/difference-of-squares/.meta/tests.toml

@@ -1,3 +1,37 @@
-# This is an auto-generated file. Regular comments will be removed when this
-# file is regenerated. Regenerating will not touch any manually added keys,
-# so comments can be added in a "comment" key.
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[e46c542b-31fc-4506-bcae-6b62b3268537]
+description = "Square the sum of the numbers up to the given number -> square of sum 1"
+
+[9b3f96cb-638d-41ee-99b7-b4f9c0622948]
+description = "Square the sum of the numbers up to the given number -> square of sum 5"
+
+[54ba043f-3c35-4d43-86ff-3a41625d5e86]
+description = "Square the sum of the numbers up to the given number -> square of sum 100"
+
+[01d84507-b03e-4238-9395-dd61d03074b5]
+description = "Sum the squares of the numbers up to the given number -> sum of squares 1"
+
+[c93900cd-8cc2-4ca4-917b-dd3027023499]
+description = "Sum the squares of the numbers up to the given number -> sum of squares 5"
+
+[94807386-73e4-4d9e-8dec-69eb135b19e4]
+description = "Sum the squares of the numbers up to the given number -> sum of squares 100"
+
+[44f72ae6-31a7-437f-858d-2c0837adabb6]
+description = "Subtract sum of squares from square of sums -> difference of squares 1"
+
+[005cb2bf-a0c8-46f3-ae25-924029f8b00b]
+description = "Subtract sum of squares from square of sums -> difference of squares 5"
+
+[b1bf19de-9a16-41c0-a62b-1f02ecc0b036]
+description = "Subtract sum of squares from square of sums -> difference of squares 100"