core: fix tests for checkInputVariables

The contract for this function has changed as part of the 0.12
reorganization so that, while before it would accept a partial variables
map if all missing variables were optional, it now expects that the caller
has already collected values for all variables and is just checking them
for type-correctness here.

terraform/semantics_test.go

@@ -9,36 +9,42 @@ import (
 func TestSMCUserVariables(t *testing.T) {
 	c := testModule(t, "smc-uservars")
 
-	// Required variables not set
+	// No variables set
 	diags := checkInputVariables(c.Module.Variables, nil)
 	if !diags.HasErrors() {
 		t.Fatal("check succeeded, but want errors")
 	}
 
 	// Required variables set, optional variables unset
+	// This is still an error at this layer, since it's the caller's
+	// responsibility to have already merged in any default values.
 	diags = checkInputVariables(c.Module.Variables, InputValues{
 		"foo": &InputValue{
 			Value:      cty.StringVal("bar"),
 			SourceType: ValueFromCLIArg,
 		},
 	})
-	if diags.HasErrors() {
-		t.Fatalf("unexpected errors: %s", diags.Err())
-	}
-
-	// Mapping complete override
-	diags = checkInputVariables(c.Module.Variables, InputValues{
-		"foo": &InputValue{
-			Value:      cty.StringVal("bar"),
-			SourceType: ValueFromCLIArg,
-		},
-		"map": &InputValue{
-			Value:      cty.StringVal("baz"),
-			SourceType: ValueFromCLIArg,
-		},
-	})
 	if !diags.HasErrors() {
 		t.Fatal("check succeeded, but want errors")
 	}
 
+	// All variables set
+	diags = checkInputVariables(c.Module.Variables, InputValues{
+		"foo": &InputValue{
+			Value:      cty.StringVal("bar"),
+			SourceType: ValueFromCLIArg,
+		},
+		"bar": &InputValue{
+			Value:      cty.StringVal("baz"),
+			SourceType: ValueFromCLIArg,
+		},
+		"map": &InputValue{
+			Value:      cty.StringVal("baz"), // okay because config has no type constraint
+			SourceType: ValueFromCLIArg,
+		},
+	})
+	if diags.HasErrors() {
+		//t.Fatal("check succeeded, but want errors")
+		t.Fatalf("unexpected errors: %s", diags.Err())
+	}
 }