test(indents/yaml): add tests

tests/indent/yaml/autoindent-mapping-pair.yaml

@@ -0,0 +1,2 @@
+- key1: value1
+  key2: value2

tests/indent/yaml/indent-sequence-items.yaml

@@ -0,0 +1,2 @@
+- key1: value1
+  key2: value2

tests/indent/yaml_spec.lua

@@ -0,0 +1,20 @@
+local Runner = require("tests.indent.common").Runner
+--local XFAIL = require("tests.indent.common").XFAIL
+
+local run = Runner:new(it, "tests/indent/yaml", {
+  shiftwidth = 2,
+  expandtab = true,
+})
+
+describe("indent YAML:", function()
+  describe("whole file:", function()
+    run:whole_file(".", {
+      expected_failures = {},
+    })
+  end)
+
+  describe("new line:", function()
+    run:new_line("indent-sequence-items.yaml", { on_line = 2, text = "key3: value3", indent = 2 })
+    run:new_line("autoindent-mapping-pair.yaml", { on_line = 1, text = "key3: value3", indent = 2 })
+  end)
+end)