Environment variable Path should be used as case-insensitive

fix #438

Author: slawekjaranowski

src/main/java/org/codehaus/mojo/exec/ExecMojo.java

@@ -36,6 +36,7 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.TreeSet;
 import java.util.function.Consumer;
@@ -488,8 +489,7 @@ private Map<String, String> handleSystemEnvVariables() throws MojoExecutionExcep
         }
 
         if (this.getLog().isDebugEnabled()) {
-            Set<String> keys = new TreeSet<>();
-            keys.addAll(enviro.keySet());
+            Set<String> keys = new TreeSet<>(enviro.keySet());
             for (String key : keys) {
                 this.getLog().debug("env: " + key + "=" + enviro.get(key));
             }
@@ -825,10 +825,13 @@ private List<String> getExecutablePaths(Map<String, String> enviro) {
         List<String> paths = new ArrayList<>();
         paths.add("");
 
-        String path = enviro.get("PATH");
-        if (path != null) {
-            paths.addAll(Arrays.asList(StringUtils.split(path, File.pathSeparator)));
-        }
+        enviro.entrySet().stream()
+                .filter(entry -> "PATH".equalsIgnoreCase(entry.getKey()))
+                .map(Map.Entry::getValue)
+                .filter(Objects::nonNull)
+                .map(path -> path.split(File.pathSeparator))
+                .map(Arrays::asList)
+                .forEach(paths::addAll);
 
         return paths;
     }

src/test/java/org/codehaus/mojo/exec/ExecMojoTest.java

@@ -144,17 +144,20 @@ public void testGetExecutablePath() throws IOException {
 
             final String comSpec = System.getenv("ComSpec");
 
+            // for windows scripts cmd should be used
             realMojo.setExecutable("javax.bat");
             cmd = realMojo.getExecutablePath(enviro, workdir);
-            assertTrue(
-                    "is bat file on windows, execute using ComSpec.",
-                    cmd.getExecutable().equals(comSpec));
+            assertEquals("is bat file on windows, execute using ComSpec.", comSpec, cmd.getExecutable());
+            assertEquals("is /c argument pass using ComSpec.", "/c", cmd.getArguments()[0]);
 
-            enviro.put("PATH", workdir.getAbsolutePath() + File.separator + "target");
+            String path = workdir.getAbsolutePath() + File.separator + "target";
+            enviro.put("Path", path);
+            realMojo.setExecutable("javax"); // FIXME javax.bat should be also allowed
             cmd = realMojo.getExecutablePath(enviro, workdir);
-            assertTrue(
-                    "is bat file on windows' PATH, execute using ComSpec.",
-                    cmd.getExecutable().equals(comSpec));
+            assertEquals("is bat file on windows, execute using ComSpec.", comSpec, cmd.getExecutable());
+            assertEquals("is /c argument pass using ComSpec.", "/c", cmd.getArguments()[0]);
+            assertEquals("full path is discovered.", path + File.separator + "javax.bat", cmd.getArguments()[1]);
+
             f.delete();
             assertFalse("file deleted...", f.exists());
         }