Improve regression test coverage of regress.c.

It's a bit silly to have test functions that aren't tested, so test
them.

In passing, rename int44in/int44out to city_budget_in/_out so that they
match how the regression tests use them.  Also, fix city_budget_out
so that it emits the format city_budget_in expects to read; otherwise
we'd have dump/reload failures when testing pg_dump against the
regression database.  (We avoided that in the past only because no
data of type city_budget was actually stored anywhere.)

Discussion: https://postgr.es/m/29322.1519701006@sss.pgh.pa.us

src/test/regress/expected/create_misc.out

@@ -24,6 +24,16 @@ INSERT INTO equipment_r (name, hobby) VALUES ('advil', 'posthacking');
 INSERT INTO equipment_r (name, hobby) VALUES ('peet''s coffee', 'posthacking');
 INSERT INTO equipment_r (name, hobby) VALUES ('hightops', 'basketball');
 INSERT INTO equipment_r (name, hobby) VALUES ('guts', 'skywalking');
+INSERT INTO city VALUES
+('Podunk', '(1,2),(3,4)', '100,127,1000'),
+('Gotham', '(1000,34),(1100,334)', '123456,127,-1000,6789');
+TABLE city;
+  name  |       location       |        budget         
+--------+----------------------+-----------------------
+ Podunk | (3,4),(1,2)          | 100,127,1000,0
+ Gotham | (1100,334),(1000,34) | 123456,127,-1000,6789
+(2 rows)
+
 SELECT *
    INTO TABLE ramp
    FROM road

src/test/regress/expected/create_operator.out

@@ -26,6 +26,14 @@ CREATE OPERATOR #%# (
    leftarg = int8,		-- right unary
    procedure = numeric_fac
 );
+-- Test operator created above
+SELECT point '(1,2)' <% widget '(0,0,3)' AS t,
+       point '(1,2)' <% widget '(0,0,1)' AS f;
+ t | f 
+---+---
+ t | f
+(1 row)
+
 -- Test comments
 COMMENT ON OPERATOR ###### (int4, NONE) IS 'bad right unary';
 ERROR:  operator does not exist: integer ######

src/test/regress/expected/create_type.out

@@ -16,8 +16,8 @@ CREATE TYPE widget (
 );
 CREATE TYPE city_budget (
    internallength = 16,
-   input = int44in,
-   output = int44out,
+   input = city_budget_in,
+   output = city_budget_out,
    element = int4,
    category = 'x',   -- just to verify the system will take it
    preferred = true  -- ditto
@@ -182,3 +182,12 @@ WHERE attrelid = 'mytab'::regclass AND attnum > 0;
  widget(42,13)
 (1 row)
 
+-- might as well exercise the widget type while we're here
+INSERT INTO mytab VALUES ('(1,2,3)'), ('(-44,5.5,12)');
+TABLE mytab;
+     foo      
+--------------
+ (1,2,3)
+ (-44,5.5,12)
+(2 rows)
+

src/test/regress/input/create_function_1.source

@@ -12,12 +12,12 @@ CREATE FUNCTION widget_out(widget)
    AS '@libdir@/regress@DLSUFFIX@'
    LANGUAGE C STRICT IMMUTABLE;
 
-CREATE FUNCTION int44in(cstring)
+CREATE FUNCTION city_budget_in(cstring)
    RETURNS city_budget
    AS '@libdir@/regress@DLSUFFIX@'
    LANGUAGE C STRICT IMMUTABLE;
 
-CREATE FUNCTION int44out(city_budget)
+CREATE FUNCTION city_budget_out(city_budget)
    RETURNS cstring
    AS '@libdir@/regress@DLSUFFIX@'
    LANGUAGE C STRICT IMMUTABLE;

src/test/regress/output/create_function_1.source

@@ -12,13 +12,13 @@ CREATE FUNCTION widget_out(widget)
    AS '@libdir@/regress@DLSUFFIX@'
    LANGUAGE C STRICT IMMUTABLE;
 NOTICE:  argument type widget is only a shell
-CREATE FUNCTION int44in(cstring)
+CREATE FUNCTION city_budget_in(cstring)
    RETURNS city_budget
    AS '@libdir@/regress@DLSUFFIX@'
    LANGUAGE C STRICT IMMUTABLE;
 NOTICE:  type "city_budget" is not yet defined
 DETAIL:  Creating a shell type definition.
-CREATE FUNCTION int44out(city_budget)
+CREATE FUNCTION city_budget_out(city_budget)
    RETURNS cstring
    AS '@libdir@/regress@DLSUFFIX@'
    LANGUAGE C STRICT IMMUTABLE;

src/test/regress/regress.c

@@ -427,19 +427,19 @@ set_ttdummy(PG_FUNCTION_ARGS)
 
 
 /*
- * Type int44 has no real-world use, but the regression tests use it.
+ * Type city_budget has no real-world use, but the regression tests use it.
  * It's a four-element vector of int4's.
  */
 
 /*
- *		int44in			- converts "num num ..." to internal form
+ *		city_budget_in			- converts "num, num, ..." to internal form
  *
  *		Note: Fills any missing positions with zeroes.
  */
-PG_FUNCTION_INFO_V1(int44in);
+PG_FUNCTION_INFO_V1(city_budget_in);
 
 Datum
-int44in(PG_FUNCTION_ARGS)
+city_budget_in(PG_FUNCTION_ARGS)
 {
 	char	   *input_string = PG_GETARG_CSTRING(0);
 	int32	   *result = (int32 *) palloc(4 * sizeof(int32));
@@ -458,27 +458,22 @@ int44in(PG_FUNCTION_ARGS)
 }
 
 /*
- *		int44out		- converts internal form to "num num ..."
+ *		city_budget_out		- converts internal form to "num, num, ..."
  */
-PG_FUNCTION_INFO_V1(int44out);
+PG_FUNCTION_INFO_V1(city_budget_out);
 
 Datum
-int44out(PG_FUNCTION_ARGS)
+city_budget_out(PG_FUNCTION_ARGS)
 {
 	int32	   *an_array = (int32 *) PG_GETARG_POINTER(0);
-	char	   *result = (char *) palloc(16 * 4);	/* Allow 14 digits + sign */
-	int			i;
-	char	   *walk;
+	char	   *result = (char *) palloc(16 * 4);
+
+	snprintf(result, 16 * 4, "%d,%d,%d,%d",
+			 an_array[0],
+			 an_array[1],
+			 an_array[2],
+			 an_array[3]);
 
-	walk = result;
-	for (i = 0; i < 4; i++)
-	{
-		pg_ltoa(an_array[i], walk);
-		while (*++walk != '\0')
-			;
-		*walk++ = ' ';
-	}
-	*--walk = '\0';
 	PG_RETURN_CSTRING(result);
 }
 
@@ -861,5 +856,6 @@ PG_FUNCTION_INFO_V1(test_fdw_handler);
 Datum
 test_fdw_handler(PG_FUNCTION_ARGS)
 {
+	elog(ERROR, "test_fdw_handler is not implemented");
 	PG_RETURN_NULL();
 }

src/test/regress/sql/create_misc.sql

@@ -37,6 +37,11 @@ INSERT INTO equipment_r (name, hobby) VALUES ('hightops', 'basketball');
 
 INSERT INTO equipment_r (name, hobby) VALUES ('guts', 'skywalking');
 
+INSERT INTO city VALUES
+('Podunk', '(1,2),(3,4)', '100,127,1000'),
+('Gotham', '(1000,34),(1100,334)', '123456,127,-1000,6789');
+TABLE city;
+
 SELECT *
    INTO TABLE ramp
    FROM road

src/test/regress/sql/create_operator.sql

@@ -32,6 +32,10 @@ CREATE OPERATOR #%# (
    procedure = numeric_fac
 );
 
+-- Test operator created above
+SELECT point '(1,2)' <% widget '(0,0,3)' AS t,
+       point '(1,2)' <% widget '(0,0,1)' AS f;
+
 -- Test comments
 COMMENT ON OPERATOR ###### (int4, NONE) IS 'bad right unary';
 

src/test/regress/sql/create_type.sql

@@ -18,8 +18,8 @@ CREATE TYPE widget (
 
 CREATE TYPE city_budget (
    internallength = 16,
-   input = int44in,
-   output = int44out,
+   input = city_budget_in,
+   output = city_budget_out,
    element = int4,
    category = 'x',   -- just to verify the system will take it
    preferred = true  -- ditto
@@ -144,3 +144,7 @@ CREATE TEMP TABLE mytab (foo widget(42,13));
 
 SELECT format_type(atttypid,atttypmod) FROM pg_attribute
 WHERE attrelid = 'mytab'::regclass AND attnum > 0;
+
+-- might as well exercise the widget type while we're here
+INSERT INTO mytab VALUES ('(1,2,3)'), ('(-44,5.5,12)');
+TABLE mytab;