specsuite: a few additional tests for structure

This is still not fully comprehensive, but tests some basic functionality.

specsuite/tests/structure/attributes/unexpected.hcl

@@ -0,0 +1,4 @@
+a = "a value"
+b = "b value"
+c = "c value"
+d = "d value"

specsuite/tests/structure/attributes/unexpected.hcldec

@@ -0,0 +1,11 @@
+object {
+  attr "a" {
+    type = string
+  }
+  attr "b" {
+    type = string
+  }
+  attr "d" {
+    type = string
+  }
+}

specsuite/tests/structure/attributes/unexpected.t

@@ -0,0 +1,15 @@
+diagnostics {
+  error {
+    # An argument named "c" is not expected here.
+    from {
+      line   = 3
+      column = 1
+      byte   = 28
+    }
+    to {
+      line   = 3
+      column = 2
+      byte   = 29
+    }
+  }
+}

specsuite/tests/structure/blocks/single_empty_oneline.hcl

@@ -0,0 +1 @@
+a {}

specsuite/tests/structure/blocks/single_empty_oneline.hcldec

@@ -0,0 +1,4 @@
+block {
+  block_type = "a"
+  object {}
+}

specsuite/tests/structure/blocks/single_empty_oneline.t

@@ -0,0 +1 @@
+result_type = object({})

specsuite/tests/structure/blocks/single_expected.hcl

@@ -0,0 +1,3 @@
+a {
+
+}

specsuite/tests/structure/blocks/single_expected.hcldec

@@ -0,0 +1,4 @@
+block {
+  block_type = "a"
+  object {}
+}

specsuite/tests/structure/blocks/single_expected.t

@@ -0,0 +1 @@
+result_type = object({})

specsuite/tests/structure/blocks/single_unclosed.hcl

@@ -0,0 +1 @@
+a {

specsuite/tests/structure/blocks/single_unclosed.hcldec

@@ -0,0 +1,4 @@
+block {
+  block_type = "a"
+  object {}
+}

specsuite/tests/structure/blocks/single_unclosed.t

@@ -0,0 +1,14 @@
+diagnostics {
+  error {
+    from {
+      line   = 2
+      column = 1
+      byte   = 4
+    }
+    to {
+      line   = 2
+      column = 1
+      byte   = 4
+    }
+  }
+}