add julia test file

tests/syntax-tests/highlighted/Julia/test.jl

@@ -0,0 +1,73 @@
+# The `test.jl` file has been adapted from [https://github.com/mitmath/18S191/blob/master/lecture_notebooks/Basic%20Julia%20syntax.jl] and is subject to no license.
+
+x = 3
+
+y = 2x
+
+typeof(y)
+
+f(x) = 2 + x
+
+
+f
+
+f(10)
+
+
+function g(x, y)
+    z = x + y
+    return z^2
+end
+
+g(1, 2)
+
+let s = 0
+    for i in 1:10
+        s += i    # Equivalent to s = s + i
+    end
+    s
+end
+
+
+typeof(1:10)
+
+function mysum(n)
+    s = 0
+    for i in 1:n
+        s += i
+    end
+    return s
+end
+
+mysum(100)
+
+a = 3
+
+a < 5
+
+if a < 5
+    "small"
+else
+    "big"
+end
+
+v = [1, 2, 3]
+
+typeof(v)
+
+v[2]
+
+v[2] = 10
+
+v2 = [i^2 for i in 1:10]
+
+M = [1 2
+     3 4]
+
+typeof(M)
+
+zeros(5, 5)
+
+zeros(Int, 4, 5)
+
+[i + j for i in 1:5, j in 1:6]