Add more tests for the SPDX-License-Identifier

scripts/check_style.sh

@@ -5,6 +5,7 @@
 EXCLUDE_FILES=(
   "libsolutil/picosha2.h"
   "test/libsolutil/UTF8.cpp"
+  "test/libsolidity/syntaxTests/license/license_whitespace_trailing.sol"
 )
 EXCLUDE_FILES_JOINED=$(printf "%s\|" "${EXCLUDE_FILES[@]}")
 EXCLUDE_FILES_JOINED=${EXCLUDE_FILES_JOINED%??}

test/libsolidity/syntaxTests/license/license_hidden_unicode.sol

@@ -0,0 +1,3 @@
+// This is parsed as GPL-3.0:
+// SPDX-License-Identifier: GPL-3.0 ⡉⡊⡋⡌⡍⡎⡏⡐⡑⡒
+contract C {}

test/libsolidity/syntaxTests/license/license_natspec.sol

@@ -0,0 +1,2 @@
+/// SPDX-License-Identifier: GPL-3.0
+contract C {}

test/libsolidity/syntaxTests/license/license_unicode.sol

@@ -0,0 +1,3 @@
+// This is just ignored:
+// SPDX-License-Identifier: ⡉⡊⡋⡌⡍⡎⡏⡐⡑⡒
+contract C {}

test/libsolidity/syntaxTests/license/license_whitespace_after_colon.sol

@@ -0,0 +1,2 @@
+// SPDX-License-Identifier:    GPL-3.0
+contract C {}

test/libsolidity/syntaxTests/license/license_whitespace_before_spdx.sol

@@ -0,0 +1,2 @@
+//     SPDX-License-Identifier: GPL-3.0
+contract C {}

test/libsolidity/syntaxTests/license/license_whitespace_trailing.sol

@@ -0,0 +1,2 @@
+// SPDX-License-Identifier: GPL-3.0   
+contract C {}