Add todo spec test for libsass issue 2236

sass/libsass#2236

Author: mgreter

spec/libsass-todo-issues/issue_2236/floats/expected_output.css

@@ -0,0 +1,6 @@
+.foo {
+  test-01: 1.2;
+  test-02: -3.5;
+  test-03: 3.5;
+  test-04: -1.2;
+}

spec/libsass-todo-issues/issue_2236/floats/input.scss

@@ -0,0 +1,6 @@
+.foo {
+  test-01: +1.2 % +4.7;
+  test-02: +1.2 % -4.7;
+  test-03: -1.2 % +4.7;
+  test-04: -1.2 % -4.7;
+}

spec/libsass-todo-issues/issue_2236/ints/expected_output.css

@@ -0,0 +1,6 @@
+.foo {
+  test-01: 1;
+  test-02: -3;
+  test-03: 3;
+  test-04: -1;
+}

spec/libsass-todo-issues/issue_2236/ints/input.scss

@@ -0,0 +1,6 @@
+.foo {
+  test-01: +1 % +4;
+  test-02: +1 % -4;
+  test-03: -1 % +4;
+  test-04: -1 % -4;
+}

spec/libsass-todo-issues/issue_2236/options.yml

@@ -0,0 +1,4 @@
+---
+:start_version: '3.4'
+:todo:
+- dart-sass

spec/libsass-todo-issues/issue_2236/zeros/expected_output.css

@@ -0,0 +1,6 @@
+.foo {
+  test-01: 0;
+  test-02: 0;
+  test-03: 0;
+  test-04: 0;
+}

spec/libsass-todo-issues/issue_2236/zeros/input.scss

@@ -0,0 +1,6 @@
+.foo {
+  test-01: +0 % 1;
+  test-02: -0 % 1;
+  test-03: +0 % -1;
+  test-04: -0 % -1;
+}