Add dshell tests for Issue 22816 and Issue 22817

test/dshell/extra-files/issue22816.d

@@ -0,0 +1 @@
+module issue22816;

test/dshell/issue22816.d

@@ -0,0 +1,23 @@
+import dshell;
+
+int main()
+{
+    auto stderr_file = shellExpand("$OUTPUT_BASE/issue22816.err");
+    auto stderr = File(stderr_file, "w");
+
+    string cmd = "$DMD -m$MODEL -c $EXTRA_FILES/issue22816.c";
+    string expected = shellExpand("^Error: cannot find input file `$EXTRA_FILES" ~ SEP ~ "issue22816.c`");
+
+    version (Windows)
+        expected = expected.replace(`\`, `\\`); // Replace \ => \\ for regex
+
+    const exitCode = tryRun(cmd, std.stdio.stdout, stderr);
+    assert(exitCode == 1, "DMD should've failed!");
+
+    Vars.set("stderr", stderr_file);
+    Vars.stderr
+        .grep(expected)
+        .enforceMatches("Expected 'Error: cannot find input file'");
+
+    return 0;
+}

test/dshell/issue22817.d

@@ -0,0 +1,23 @@
+import dshell;
+
+int main()
+{
+    auto stderr_file = shellExpand("$OUTPUT_BASE/issue22817.err");
+    auto stderr = File(stderr_file, "w");
+
+    string cmd = "$DMD -m$MODEL -c $EXTRA_FILES/issue22817.d";
+    string expected = shellExpand("^Error: cannot find input file `$EXTRA_FILES" ~ SEP ~ "issue22817.d`");
+
+    version (Windows)
+        expected = expected.replace(`\`, `\\`); // Replace \ => \\ for regex
+
+    const exitCode = tryRun(cmd, std.stdio.stdout, stderr);
+    assert(exitCode == 1, "DMD should've failed!");
+
+    Vars.set("stderr", stderr_file);
+    Vars.stderr
+        .grep(expected)
+        .enforceMatches("Expected 'Error: cannot find input file'");
+
+    return 0;
+}

test/tools/dshell_prebuilt/dshell_prebuilt.d

@@ -180,6 +180,14 @@ auto tryRun(scope const(char[])[] args, File stdout = std.stdio.stdout,
     auto proc = spawnProcess(args, stdin, stdout, stderr, env);
     return wait(proc);
 }
+
+/// ditto
+auto tryRun(string cmd, File stdout = std.stdio.stdout,
+            File stderr = std.stdio.stderr, string[string] env = null)
+{
+    return tryRun(parseCommand(cmd), stdout, stderr, env);
+}
+
 /// ditto
 void run(scope const(char[])[] args, File stdout = std.stdio.stdout,
          File stderr = std.stdio.stderr, string[string] env = null)