Add more RGBLINK test coverage (#1637)

test/link/invalid-patches.asm

@@ -0,0 +1,10 @@
+section "zero", rom0
+Zero::
+db 1 % Zero
+db 2 ** (Zero - 1)
+db BANK(NonexistentSymbol)
+db BANK("NonexistentSection")
+db STARTOF("NonexistentSection")
+db SIZEOF("NonexistentSection")
+ldh [Zero], a
+jr Zero + 200

test/link/invalid-patches.out

@@ -0,0 +1,9 @@
+error: invalid-patches.asm(10): JR target must be between -128 and 127 bytes away, not 190; use JP instead
+warning: invalid-patches.asm(9): LDH is deprecated with values from $00 to $FF; use $FF00 to $FFFF
+error: invalid-patches.asm(8): Requested SIZEOF() of section "NonexistentSection", which was not found
+error: invalid-patches.asm(7): Requested STARTOF() of section "NonexistentSection", which was not found
+error: invalid-patches.asm(6): Requested BANK() of section "NonexistentSection", which was not found
+error: invalid-patches.asm(5): Requested BANK() of symbol "NonexistentSymbol", which was not found
+error: invalid-patches.asm(4): Exponent by negative value -1
+error: invalid-patches.asm(3): Modulo by 0
+Linking failed with 7 errors

test/link/section-conflict/different-mod/a.asm

@@ -0,0 +1,2 @@
+section fragment "test", rom0
+db 1

test/link/section-conflict/different-mod/b.asm

@@ -0,0 +1,2 @@
+section union "test", rom0
+db 2

test/link/section-conflict/different-mod/out.err

@@ -0,0 +1 @@
+error: Section "test" is defined as SECTION FRAGMENT at section-conflict/different-mod/a.asm(1), but as SECTION UNION at section-conflict/different-mod/b.asm(1)

test/link/test.sh

@@ -269,6 +269,15 @@ rgblinkQuiet "$otemp" "$test"/b.rel 2>"$outtemp"
 tryDiff "$test"/out.err "$outtemp"
 evaluateTest
 
+test="section-conflict/different-mod"
+startTest
+"$RGBASM" -o "$otemp" "$test"/a.asm
+"$RGBASM" -o "$gbtemp" "$test"/b.asm
+continueTest
+rgblinkQuiet "$otemp" "$gbtemp" 2>"$outtemp"
+tryDiff "$test"/out.err "$outtemp"
+evaluateTest
+
 test="section-fragment/good"
 startTest
 "$RGBASM" -o "$otemp" "$test"/a.asm