diff --git a/lexer/comment_start_nested.mj b/lexer/comment_start_nested.mj
new file mode 100644
index 0000000000000000000000000000000000000000..b55461c7d856e16bfb9de0ee20afab594cd23865
--- /dev/null
+++ b/lexer/comment_start_nested.mj
@@ -0,0 +1,3 @@
+/* starting an nested comment /*
+should not produce an error
+*/
diff --git a/lexer/comment_start_nested.mj.out b/lexer/comment_start_nested.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..1a2b1dc142b40bd859036d3dac387b1b93663d06
--- /dev/null
+++ b/lexer/comment_start_nested.mj.out
@@ -0,0 +1 @@
+EOF
diff --git a/lexer/file-noendofline.mj b/lexer/file-noendofline.mj
new file mode 100644
index 0000000000000000000000000000000000000000..757f0164b2c77192f7a67bf979e59effee983415
--- /dev/null
+++ b/lexer/file-noendofline.mj
@@ -0,0 +1 @@
+noendofline
diff --git a/lexer/file-noendofline.mj.out b/lexer/file-noendofline.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..f7e66e6d98c8e1eafd5bdb47ad97195c115509c2
--- /dev/null
+++ b/lexer/file-noendofline.mj.out
@@ -0,0 +1,2 @@
+identifier noendofline
+EOF
diff --git a/lexer/invalid-integer.mj b/lexer/invalid-integer.mj
new file mode 100644
index 0000000000000000000000000000000000000000..af21b805d5164d20b8ae4b426c93437b662c8757
--- /dev/null
+++ b/lexer/invalid-integer.mj
@@ -0,0 +1 @@
+int test = 42x;
diff --git a/lexer/invalid-integer.mj.out b/lexer/invalid-integer.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..76017c5151a55b4c009875367978d6a18f6a8078
--- /dev/null
+++ b/lexer/invalid-integer.mj.out
@@ -0,0 +1,7 @@
+int
+identifier test
+=
+integer literal 42
+identifier x
+;
+EOF
diff --git a/lexer/nasty-comments.mj b/lexer/nasty-comments.mj
new file mode 100644
index 0000000000000000000000000000000000000000..24e511deb33ae9c3703b70c8c283f3ab2e641fbb
--- /dev/null
+++ b/lexer/nasty-comments.mj
@@ -0,0 +1,10 @@
+/* Test comments */
+
+public void func/*TEST*/() {
+    int local  /*-------*/ = 10;
+
+    /** A comment with another /* comment starting within
+
+    public int x;
+    */
+}
diff --git a/lexer/nasty-comments.mj.out b/lexer/nasty-comments.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..ca61ea5df68bc3028490d8d99c8a33ef1db655a3
--- /dev/null
+++ b/lexer/nasty-comments.mj.out
@@ -0,0 +1,13 @@
+public
+void
+identifier func
+(
+)
+{
+int
+identifier local
+=
+integer literal 10
+;
+}
+EOF
diff --git a/lexer/prinzip_des_laengsten_musters.mj b/lexer/prinzip_des_laengsten_musters.mj
new file mode 100644
index 0000000000000000000000000000000000000000..bbeeee3bf11381647f0523ec85c2e767ffb7e67a
--- /dev/null
+++ b/lexer/prinzip_des_laengsten_musters.mj
@@ -0,0 +1 @@
+==<<>>=====++=+=+--<==>==&&||&=|=>>>>>>>>=>>>=%=*=/=^=
diff --git a/lexer/prinzip_des_laengsten_musters.mj.out b/lexer/prinzip_des_laengsten_musters.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..cef93666a06973da248af87f1bc5ad68b580ef61
--- /dev/null
+++ b/lexer/prinzip_des_laengsten_musters.mj.out
@@ -0,0 +1,27 @@
+==
+<<
+>>=
+==
+==
+++
+=
++=
++
+--
+<=
+=
+>=
+=
+&&
+||
+&=
+|=
+>>>
+>>>
+>>=
+>>>=
+%=
+*=
+/=
+^=
+EOF